Combat

Combat Stages

For most combat engagements, the battle will begin in day combat and follow the following set of stages. Several stages will not occur unless certain conditions are met. For Event maps, a Combined Fleet mechanic has been implemented which follows a modified combat order.

Stage	Notes
Formation Selection	With 4 or more ships in a fleet, a fleet formation must be selected before combat. The selected formation affects ship damage, hit rate, and defense.
Detection	Requires planes or high detection stat (usually from RADAR). Success increases accuracy and evasion. Failure prevents participation of allied planes in the aerial combat phase.
Aerial Combat	Participants: CVLs, CVs, BBVs, CAVs, AVs, SSVs Requires any type of offensive plane (torpedo bombers and dive bombers for CVLs and CVs, and seaplane bombers for BBVs, CAVs, AVs, and SSVs) equipped as equipment on either side. If a side achieves Air Superiority or Supremacy in this stage, that side can use Artillery Spotting.
Opening Stages	Expedition Supporting Fire Supporting Fire from Sortie Support Expeditions. This has an aspect of randomness and may not trigger. Opening Torpedo Salvo Participants: [[::Category:Submarines|SS]] over level 10, ships equipped with Type A Ko-hyoteki (CLTs, AVs, [[::Category:Submarines|SS]]) and enemy Battleship Re-Class Elite. All participants fire their torpedoes simultaneously. Engagement Form The orientation of the allied and enemy fleets is displayed. This affects both fleets equally.
Day Combat	Shelling, 1st Round (Range Order) Participants: All ships except SS. Firing order alternates between allied and enemy sides starting with allied. For each side, ships with higher range have priority. The firing order is composed of only ships that are able to take part and is set at the start of each shelling phase. Any ships sunk or incapacitated before their turn results in a lost turn for the side it is on. Shelling, 2nd Round (Lineup Order) Participants: All ships except SS. Firing order alternates between sides, prioritizing ships at the top of the list. Only occurs when either side has a BB, BBV, or the enemy has one of the special ship classes (鬼 Oni/Ogress, 姫 Hime/Princess) which acts like a BB/BBV: Destroyer Princess (駆逐棲姫) does not, while Battleship Princess (戦艦棲姫) does. The distinction between Bosses that do and those that do not trigger this phase is not always clear from their names. Closing Torpedo Salvo Participants: DDs, CLs, CLTs, CAs, CAVs, SS, Bismarck drei, Battleship Re-Class Like the opening torpedo salvo, all participants attack simultaneously.
Night Combat	Participants: All ships except CVLs and CVs. Enemy Standard Carrier Wo-Class and Light Carrier Nu-Class of flagship level or higher can attack at night. Must not be critically damaged to participate. The first slot allied ship attacks, then the first slot enemy ship attacks, and so on. Similar to shelling phase, if a ship is sunk or critically damaged, the game will skip its turn.

For certain nodes and events, combat begins in the Night Combat stage, then proceeds to Day combat, if certain conditions are met.

Formation Selection

With 4 or more ships in a fleet, a fleet formation must be selected before combat. The selected formation affects ship damage and hit rate.

Formation Modifier

Formation	Formation Icon	Surface Damage Modifier	Anti-sub Damage Modifier	Sub Defence Modifier	Anti-air Modifier	Day Shelling Hit Rate	Day Torpedo Hit Rate	Night Battle Hit Rate	Flagship Protection Rate
Line Ahead 単縦陣 (Tanjuu-jin, 単縦陣?)		100%	45%	Low	100%	Medium	High	Higher	Low
Double Line 複縦陣 (Fukujuu-jin, 複縦陣?)		80%	60%	Low?	120%	High	Medium	Medium	Medium
Diamond 輪形陣 (Rinkei-jin, 輪形陣?)		70%	90%	High	160%	Medium	Very Low	?	High
Echelon 梯形陣 (Teikei-jin, 梯形陣?)		60%	75%	Medium	100%	Medium	Low	Lower	Medium
Line Abreast 単横陣 (Tan'ou-jin, 単横陣?)		60%	100%	Medium?	100%	High	Very Low	Lower	Medium

• The surface damage modifier applies to both shelling and torpedo attacks, but does not affect Aerial Combat or Anti-Submarine attacks.
• Diamond Formation is only selectable as a formation with 5+ ships.
• Flagship protection is the situation where a non-flagship ship protects the flagship from being damaged by receiving the attack instead.
• Line Ahead has the highest offensive power for surface combat. It is the default choice for encounters after the 3rd battle node to preserve firepower because of the remaining ammo penalty.
• Double Line is generally a good formation for heavy BB/CV fleets. There is a significant accuracy increase that benefits the typically lower accuracy carriers, while BB often still have enough firepower.
• Diamond has the best anti-air modifier and flagship protection, and is almost as good as Line Abreast for anti-sub purposes. A good alternative to Line Abreast when facing mixed surface-sub fleets.
• Line Abreast is the best formation for anti-sub purposes.
• Echelon has not been tested extensively, but it is hypothesized to be a defensive formation for submarines; subs profit from the slightly heightened torpedo accuracy when compared to Diamond and Line Abreast, both common defensive formations.

Detection

Success	Failed
Effects
Up	Failure prevents participation of allied planes in the Aerial Combat Phase.
Fleet LOS affects Detection rate.

Aerial Combat

Aerial Combat Stages

Stage	Notes
Fighter Combat	Battle for air supremacy. Determines if Artillery Spotting and/or Contact are possible.
Anti-bomber Combat	Number of bombers shot down by fighters is affected by the result of the previous phase
Anti-Air Cut-In	An Anti-Air Director may cause heavy damage to enemy bombers
Fleet Anti-air Defense	Fleet defends against enemy bombers
Bombing	Each dive/torpedo bomber alive attacks one random target, See Damage Calculation for details

Fighter Combat

${\text{Fighter Power}}=\sum ^{\text{All slots}}{\text{Floor(}}{\sqrt {\text{Number planes in slot}}}\times {\text{Plane anti-air stat}}{\text{)}}$

• Fighter planes, and specific Torpedo / Dive / Seaplane bombers with an +AA stat participate in the Fighter Combat.
• Recon planes (carrier based or seaplane recon) will NOT participate in Fighter Combat.
• The allied fleet and enemy fleet's Fighter Powers are compared to determine the result of Fighter Combat:

Fighter Power	Result	Text Display	% Shot Down	Contact	Combat Screens
FP ≥ 3*EFP	Air Supremacy (AS+)	制空権確保! Seikuuken Kakuho!	0~90%	Allied only
3*EFP > FP ≥ 1.5*EFP	Air Superiority (AS)	航空優勢! Koukuu Yuusei!	0~80%	Both sides
1.5*EFP > FP ≥ 2/3*EFP	Air Parity	No text displayed	0~60%	Both sides
2/3*EFP > FP ≥ 1/3*EFP	Air Incapability	No text displayed	0~40%	Both sides
FP < 1/3*EFP	Air Denial	制空権喪失! Seikuuken Soushitsu!	0~10%	Enemy only

• EFP: Enemy Fighter Power, FP: Fighter Power. Abbreviated to save space.
• This calculation does not take into account any anti-air weaponry equipped on ships. Carrier anti-air stat is also not considered.
• The percentage of planes shot down applies for both sides' respective outcomes, and is calculated per slot.
  • For example, securing Air Superiority means allied planes shoot down up to 80% of enemy planes, and the enemy under Air Incapability will shoot down up to 40%.
  • As this is applied per slot, 80% of one enemy bomber group can be shot down while a second has 0% shot down.
• Planes loaded on moderately/heavily damaged carriers can still join this stage of fighter combat.
• Contact can be triggered by having at least 1 carrier scout plane, seaplane scout, and/or torpedo bomber equipped. It increases damage during the bombing phase depending on the accuracy bonus of the squad triggering Contact.
• Even if allied planes secure air supremacy, planes can still be lost (up to 10%), and the subsequent anti-air defense stage can eliminate more bombers.
• If the enemy fleet launches no fighters and any planes are launched from either side, the result defaults to Air Supremacy. If both sides launch no planes, then the rest of the battle is treated the same as if Air Parity was achieved.
• This site provides a calculator for the best way to achieve air supremacy/superiority using the minimum number of planes for each map given your fleet composition, but is in Japanese.

Enemy Ship Fighter Power

Enemy Ship Type	Fighter Power	Enemy Ship Type	Fighter Power
Light Carrier Nu-Class	8	Armored Carrier Demon	44
Light Carrier Nu-Class Elite	24	Armored Carrier Princess	48
Light Carrier Nu-Class Flagship	23	Floating Fortress	27
Standard Carrier Wo-Class	10	Southern War Demon	41
Standard Carrier Wo-Class Elite	27	Southern War Princess	47
Standard Carrier Wo-Class Flagship	28	Battleship Re-Class	94
Standard Carrier Wo-Class Flagship 2	84	Battleship Re-Class Elite	107
Standard Carrier Wo-Class Kai Flagship	102	Northern Princess World 3-5	76
Aircraft Carrier Demon	96	Northern Princess World 3-5 (final)	109

Anti-Air Cut-In

An Anti-Air Cut-In

Certain equipment combinations will provide a chance for an Anti-Air Cut-In (AACI) during the aerial combat. When activated, the cut-in animation (shown on the right) appears before engaging the enemy fighters, but does not affect the resulting air control state (AS+, AS, Air Parity or Denial). With an AA Cut-In and a good anti-air composition, it is sometimes possible to obliterate all incoming bombers before they inflict any damage, and even prevent enemy carriers from attacking during the shelling phase (since they have 0 bombers left).

Although several ships can be equipped with an AACI setup in one fleet, only one ship can perform an AACI during the aerial phase. The number of planes shot down is dependent on the ship performing the AACI and their equipment. Bringing more AACI capable ships will NOT increase the number of planes shot down via AACI.

Akizuki and Maya Kai-2 have a hidden bonus to their AA Cut-in which increases the effectiveness of their AA Cut-in tremendously.

In PVP Exercises, opposing fleets can do AA Cut-Ins, but the animation is not shown.

Fleet Anti-air Defense

Each enemy bomber slot is assigned at random to a defending ship. Those ships then, for each assigned enemy slot, have an approximately 50% chance to shoot down enemy planes. The number of planes shot down is given by the equations below:

$\text{Shot Down} = \text{Floor((Ship AA } + \text{Floor(Fleet Anti-air} \times \text{Formation Modifier))} \times 0.2125\text{)}$ $\text{Fleet Anti-air} = \text{Floor(} \sum^\text{All slots}\text{Equipment AA Bonus} \times \text{Equipment Modifier)}$

The "Fleet Anti-Air" bonus is the sum of every equipment slot of every ship in the fleet (including the defending ship).

Formation Modifiers

Formation	Modifier
Line Ahead, Line Abreast, Echelon	1.0
Double Line	1.2
Diamond	1.6

Equipment Modifiers

Equipment Type	Modifier
46cm Triple Gun Mount	0.25
High-angle Mounts	0.35
AA Radars	0.40
Type 3 Shell	0.60
All other equipment	0.20

• Any equipment that gives an anti-air bonus will contribute to shooting down enemy bombers.
• The ship chosen to defend against bombers is not necessarily the ship targeted by that slot.
• The ship selected to defend is not necessarily the target of the bomber. Any allied ship, including submarines, may be chosen to defend against bombers.
• The forward sliding and machine gun animations seem to have no correlation with the calculations.
• These calculations only apply for the allied fleet's anti-air defense; enemy fleets seem to use a different formula.

Opening Stages

The Opening Stages of combat proceed in order with the Supporting Expedition effect, the Opening Torpedo salvo, then the display of the engagement form

• In World 5 and Event Maps, the Sortie fleet can receive a salvo of Support fire from fleets deployed on Support Expeditions. The type of supporting fire depends on the composition of the expedition fleet.
• The Opening Torpedo Salvo is fired by Submarines over level 10, ships with the Type A Ko-hyoteki (CLTs, AVs, [[::Category:Submarines|SS]]) equipped, and the Enemy Battleship Re-Class.
  • Torpedoes are fired from all ships simultaneously, and accuracy is affected by the selected Formation type.
  • Unlike in the Closing Torpedo phase, moderately damaged ships can still launch torpedoes.
• The Opening stages finish with the display of the Engagement form, the orientation of the two fleets.

Engagement Form Modifier

Form	Damage Modifier	Chance	Chance with Saiun	Combat Screens
Parallel Engagement 同航戦 (Doukousen, 同航戦?)	100%	45%	45%
Head-on Engagement 反航戦 (Hankousen, 反航戦?)	80%	30%	40%
Crossing the T (Advantage) T字戦有利 (T Ji-sen Yuuri, T字戦有利?)	120%	15%	15%
Crossing the T (Disadvantage) T字戦不利 (T Ji-sen Furi, T字戦不利?)	60%	10%	0%

• Please note that all engagement forms affect both sides equally, including crossing the T (Advantage or Disadvantage).
• Night battle and aerial combat are not affected by engagement forms. Torpedo salvos are affected by engagement forms.
• Equipping a Saiun effectively makes what would have been Crossing the T (Disadvantage) become Head-on Engagement.
• It is speculated that the Engagement form also impacts accuracy.

Day Combat

• Day Combat consists of up to 3 phases: 1st Shelling, 2nd Shelling, Closing Torpedo
• During the first shelling stage, the order of fire is determined by the ship's maximum range.
  • Ships are arranged in order from Very Long → Long → Medium → Short → Very Short range.
  • The shelling order alternates from allied ships to enemy ships if able. If two ships on the same side have the same range, the ship that attacks first from between them is chosen randomly.
• The second shelling phase moves from the top to the bottom of the combat line.
  • Ships unable to attack at all in the shelling phase (i.e. submarines) will be skipped, but those normally able to attack but rendered unable to (e.g. damaged carriers) will still take actionless turns.
• CVLs and CVs must be in good or lightly damaged condition in order to participate in shelling phases, with the exception of Armored Aircraft Carriers (e.g. Taihou) who can still attack while moderately damaged. More than zero non-fighter-plane equipment is also mandatory. Note that LHA is not restricted by this.
• The Closing Torpedo salvo is fired by all SS(V), DD, CL(T), CA(V), AV, Bismarck drei, and the enemy Battleship Re-Class.
  • Torpedoes are fired from all ships simultaneously, and accuracy is affected by the selected Formation type.
  • Ships must not be moderately or heavily damaged to participate.

Night Combat

• Night battle damage depends on both the Firepower and Torpedo stats for attack power. Consequently, DDs, CLs, CLTs and CAs have drastically increased strength at night.
• Any vessel at night must not be heavily damaged (red) before attacking in order to participate in night battle.
• Certain combinations of weapon equipment (Main Guns, Secondary Guns, Torpedoes) will cause Cut-In or Double Attacks at night, greatly increasing accuracy and/or firepower
  • Auxiliary equipment (e.g RADAR, SONAR, Depth Charges, Searchlights, Turbines, Special ammunition, Pure AA Equipment, Torpedo Bulges, and Midget-subs) will not affect the combination.
• If night combat nodes are anticipated, it can be very helpful to utilize specialized night battle equipment such as Star Shells and Searchlight. Type 98 Recon Seaplane (Night Scout) is also an option.
• Evasion of submarines are greatly increased in regular Night Battles, so they cannot take more than scratch damage. In battles starting at night and Combined Fleet sorties, submarines do not get the Evasion boost, so they will take damage as normal.
• Formation damage modifiers and Engagement Form damage modifiers do not apply in Night Battle (i.e. they are always 100%).
  • As an exception, in nodes that begin with Night Battle and in Combined Fleet Night Battle, Formation and Engagement Form anti-sub damage modifiers apply.
    • The Engagement Form is not explicitly shown in Night Battle nodes.
• The animation for ships equipped with 2 different torpedoes may be different but the damage output is still the same.
  • A Prototype FaT Type 95 Oxygen Torpedo Kai + 61cm Quint (Oxygen) Torpedo Mount will show a cut-in animation of FaT+Quint+Quint and if equipped the other way around, the cut-in animation will show Quint+FaT+FaT. However, both animation produces the same damage output.

Damage Calculations

Main Formula

Damage =	Basic Attack Power x Pre-Cap Modifiers	x	Post-Cap Modifiers	-	Enemy Armor	x	Random Number (between 2/3 ~ 4/3)
	x
	Remaining Ammo Modifier
Notes: If the result is less than 1, it becomes scratch damage, which does 6-14% of current target HP, rounded down (can be rounded to 0). If the pre-cap damage (Basic Attack Power x Pre-Cap Modifiers) exceeds a certain cap value, it will be modified. This formula is under constant review and updated accordingly if there any inconsistencies or mistakes happens.

Basic Attack Power

Type	Basic Attack Power	Notes
Opening Air Strike	(Bomber's Dive Bomb or Torpedo stat) × √(Number of Planes) + 25	Number of planes is post anti-bomber combat and fleet anti-air defense
Shelling (Carriers)	(Firepower + Torpedo) × 1.5 + Dive Bomb × 2 + 55
Shelling (Others)	Firepower + 5
Torpedo	Torpedo + 5
Anti-sub warfare	Bonus * ((Ship ASW / 5) + 2 * Equipment ASW + Type)	Type: 25 if Sonar/Depth Charge (DD, CL), 10 if aircraft (AV, CVL, CAV, BBV) Bonus: 1.15 if both Sonar and Depth Charge are equipped, 1.0 otherwise. Equipment ASW: Does not seem to apply to ASW from Recon Seaplanes.
Night Battle	Firepower + Torpedo

• According to wikiwiki, multiple SONAR/Depth charges do not boost the ASW Bonus (i.e. 2 of each still makes the bonus 1.15)

Pre-Cap Modifiers

These are the factors directly applied to your ship's attack power.

• Formation Modifier (see "Damage modifier")
• Engagement Modifier
• Health Modifier
• Plane Scaling (Opening air strike only)
• Night Special Attack Modifier

Effects from the modifiers are multiplied cumulatively.

Ship's Health Modifier

Damage	Modifier
Minor damage (小破 Shouha) or less	100%
Moderate damage (中破 Chuuha)	70%
Heavy damage (大破 Taiha)	40%

These modifiers do not affect Aerial Combat.

Plane Scaling

Type	Attack Type Modifier	Notes
Dive Bombers, Seaplane Bombers	1	This value is fixed, regardless the situation.
Torpedo Bombers	0.8 or 1.5	About 50% chance of either modifier.

Applied on bombers during the opening air strike. These are the random numbers multiplied to the plane's bombing attack power.

Night Special Attack Modifier

An example of a cut-in

Certain Equipment setups have a chance to trigger special attacks at night, giving boost to both attack power and accuracy. This stage is usually the most rewarding / dangerous because both sides have drastically increased attack power.

The ship must be able to participate in the night battle in order to trigger the special attacks.

Attack Power Cap

Applies after the pre-cap modifiers. This is a soft limit on your effective attack power.

Condition: If your pre-cap attack power exceeds:

• 150 for Day Battle
• 300 for Night Battle
• 100 for Anti-sub attacks

The Attack Power Cap will be activated, nerfing the effectiveness of your pre-cap attack power. The calculation is:

$\text {Attack Power After Caps} = x + \sqrt {\text {Pre Caps Attack Power} - x}$, Where x represents the attack power cap.

Daytime Attack Cap (150) often makes it important to utilize Artillery Spotting since they boost your attack power after the cap, Night Combat can be very dangerous and/or rewarding due to having a very high cap (300) and the inclusion of torpedo to firepower for the basic attack power calculation.

Post-Cap Modifiers

In damage calculation, Post-cap modifiers apply after the cap, but before enemy armor reduction. Thus they are very effective approach to boost your damage output (esp. against heavy armor enemies).

Currently, the post-cap modifiers are from:

• Artillery Spotting (aka. Day time special attacks)
• Critical Damage
• Contact (Opening air strike)

Artillery Spotting

Certain equipment setups provide a chance to trigger special attacks during day battle, giving boost to both attack power and accuracy. The damage modifiers are applied after the cap (150), thus very effective against heavy armor targets. Note that the ship requires at least 1 seaplane on board to perform Artillery Spotting.

Critical Modifier

Most forms of attack (Torpedo, Shelling, Anti-Submarine, Preemptive Bombing) have a chance to crit the target. The damage modifier applies after the cap.

Attack Type	Modifier
Normal Attack	100%
Critical Hit	150%

It should be noted that the critical message always appears when damage dealt is greater than or equal to 40, regardless of whether the 150% modifier was applied or not. On the other hand, the critical message will never appear when damage dealt is less than or equal to 14, even if the 150% modifier was applied.

Contact

Contact takes place during the Aerial Combat phase. It increases bombing damage for all allied bombers. When successful, an image of the squadron performing contact is shown in the opposing fleet's formation indicator, with the text "触接中".

• Trigger conditions:
  • More air control than Air Denial
  • At least one carrier scout plane, seaplane scout, or torpedo bomber equipped.
    • Seaplane bombers, Type 3 Spotter, and Ka-type Autogyros cannot perform contact.
  • It's thought that each carrier scout plane, seaplane scout, and/or torpedo bomber slot equipped is given a chance to trigger contact. Once successful, the bonus applied is chosen at random with weighting preferential towards higher modifiers from all eligible equipped planes.

Different types of planes have different trigger rates. They are roughly estimated as (if only one is equipped):

Type	Contact Rate
Torpedo Bomber	~2%
Night Scout	~5%
Seaplane Scout	~20%
Carrier Scout	~60%
Flying Boat	~70%

Contact Damage Modifier

• The damage increase depends on the +accuracy bonus of the squadron performing contact.

Accuracy Bonus	Damage Modifier
+0	112%
+1	112%
+2	117%
+3	120%

Notes

• Type 2 Recon Aircraft is useful in the case that the bombing damage bonus is desired while not removing the chance for T-disadvantage, due to its high trigger rate.
• With contact, the maximum attack power of bombing (before defense, critical and ammo) is around 180. With some luck, it's possible to sink even Ru-class Flagships (Armor = 99) in one strike without a critical.

Remaining Ammo Modifier

Remaining Ammunition	Modifier
5 to 10 bars	100%
4 bars	80%
3 bars	60%
2 bars	40%
1 bar	20%
0 bars	Scratch Damage

• In general, two bars of will be used in Day Battle for all ships, regardless of whether they attack or not.
• The Remaining Ammo Modifier affects all phases, including the opening Aerial Combat Phase.
• When entering night battle, the Remaining Ammo Modifier on a vessel remains same as the previous day battle. One bar of is used for all ships in Night Battle, regardless of whether they attack or not.
• Because most battles will consume 2 bars of ammunition each, try to engage the boss before the 5th battle, or else achieving victory becomes unlikely (but not impossible).
• When attempting to defeat boss nodes, avoid night battles and whirlpools on the way.
  • Whirlpools will decrease either or bars of your sorted fleet, which can be disadvantageous in long sorties.  Equipping one or more ships with RADAR can help reduce losses taken from these.
• Submarine-only nodes on limited-time event maps do not consume ammo in Day or Night Battle.

Player Ship Protection Mechanisms

While the above formulas and statements are generally true for damage taken by a player's ships, there are additional limits that apply to friendly units only. These protection mechanisms are important for game balance and to protect your fleet from sinking.

• For ships entering battle at chuuha (orange) or higher HP:
  • Damage taken cannot reduce HP below 1.
    • Any further hits will become misses.
  • For flagships, as well as ships with 20 morale or more (i.e. not red face):
    • If damage taken exceeds a ship's current HP, then instead of taking full damage, the damage of the current attack is limited to 50%-79% (rounded down) of current HP.
      • For multi-hit attacks, such as night battle torpedo cut-in attacks, each hit is calculated separately.
      • This can occasionally help ships avoid taiha (red HP), because it narrows the range of damage where it is possible to be hit into taiha.
      • For ships with at full hp and an odd hp total, it is occasionally possible to stop damage at lightly damaged.

Combat Equipment Setup

• Anti-Air Cut-in (AACI)
• Day Battle Special Attacks (Artillery Spotting)
• Night Battle Special Attacks
• Common Setups
• Full Setup List

Anti-Air Cut-in

An Anti-Air Cut-In with Akizuki (Type H.H.R*, api_1)

With one of the following setups, your ship may perform an AA cut-in before encountering the enemy bombers, help shoot down more planes during the aerial phase. Note that AACI does NOT help you gain Air superiority.

Requirement:

One of the following sets:

1. Heavy Main Gun, Type 3 Shell , plus Anti-Aircraft Fire Director (AAFD) 
   • Can be supplemented with an AA RADAR
   • Only available for BB(V)s.
2. High-Angle mount (main gun or secondary) , plus AAFD
   • Can be supplemented with an AA RADAR
   • Achievable by any surface ship.
3. 10cm Twin High-angle Mount + AAFD, plus AA RADAR
   • Can be supplemented with another HA mount capable of AACI
   • Only available for DD & CL(T).
4. 25mm Triple Autocannon Mount (Concentrated Deployment), plus AA Gun (any) and AA RADAR
   • Achievable by any surface ship.
5. 12.7cm Twin High-angle Mount + Anti-Aircraft Fire Director, plus AA RADAR or 90mm Single High-angle Gun Mount, plus AA RADAR
   • Can be supplemented with another HA mount capable of AACI
   • Achievable by any surface ship except DDs.

• Akizuki has a built-in AA fire director, which allows her to trigger AACI without an AAFD with the following setup
  • High-Angle mount (any) plus either or both:
    • RADAR (any kind)
    • High-Angle mount (any)
• Maya Kai 2 may trigger AACI with a unique setup:
  • 25mm Triple Autocannon Mount (Concentrated Deployment), plus High-Angle mount (any) 
    • Can be supplemented with an AA RADAR

Effect:

• Provide an AoE blast on all the incoming enemy bombers, from the ship who is triggering it. (source)
• It is hypothesized that when AACI was triggered, it flatly kills a certain number (2~8) of planes per enemy bomber slot. (source: [1], [2], [3])
  • The most effective set ups belong to Maya Kai-2 (H.C,R*,, or HA mount, 25mm Autocannon mount (Concentrated.Deployment), + Air Radar)
  • Followed by Akizuki (H.H.R*, or HA mount, HA mount + Air Radar)
  • Effects from 90mm Single HA Mount is currently unknown.

Trigger Chance:

• AA stat () of the ship performing the cut-in (equipment bonuses included) affects trigger rate.
• Independent of fleet total AA stat.
• Various equipment set ups provide different activation chances. (source).
  • Akizuki (H.H.R) is possibly the one with the highest proc rate. (~67%)

Day Battle Special Attacks (Artillery Spotting)

Artillery spotting allows your ship with seaplanes to double attack (DA) and cut-in (CI) during day battle.

Cut-in Type Observed Fire using 1Main 1Sec & Type 91 AP shell

Requirement

• Air superiority (AS) or greater achieved in aerial combat phase
• Not in heavily damaged (大破) state
• Ship is carrying at least 1 seaplane. (i.e. slots are not all at 0 remaining)
• Certain equipment setup (see below)

Set up and Attack Modes

Different set ups provide chances to trigger various modes of attack.

Attack Mode	Prerequisite	The Remaining Slot	Damage Modifier	Trigger Chance
Double Attack		Any auxiliary equipment	120% x 2	~50%
Double Attack			120% x 2	Additional 3%~10% ?
Double Attack			120% x 2	Additional ~6% ?
Cut-In		Any auxiliary equipment	110%	~50%
Cut-In ( Radar )		-	110%......(Sec.Gun) 120%......(Radar)	Additional 22%~30% ?
Cut-In ( AP Shell )		-	110%......(Sec.Gun) 130%......(AP Shell)	Additional ~20%
Mixed Attack (AP)		-	120% x 2.....(DA) 150%...........(CI)	~70% (Total)
Mixed Attack (Sec.Gun)		-	120% x 2.....(DA), 110%...........(CI)	~70% (Total)

• Lists of Main gun and Secondary gun.

  

  Cut-in Type Mixed Attack Observed Fire with 2 Main & Type 91 AP Shell.

• These are the basic setups used in the game. You don't need to exactly follow the placement (1st slot = main, 3rd slot = seaplane, etc) as long as those equipment are equipped on the same ship.
• Any other setup variation will NOT change the attack mode or damage modifier. Feel free to add another auxiliary equipment when possible.
• Mixed Attacks provide chances for both day battle DA and CI.
• When either CI or DA is not triggered by chance, the ship will just do a normal single attack, dealing 100% damage.
• Trigger chances were estimated under the following conditions: AS+ & FLoS = 300; Placement: Non-flagship.
• The enemy is capable of doing Artillery Spotting on your fleet, both DA & CI.
• For more info on the Day Special Attack mechanics, you may visit page Artillery Spotting.

Trigger Chance of Artillery Spotting

• The flagship has ~15% higher chance in triggering Artillery Spotting.
• Losing Air Supremacy (AS+) to Air Superiority (AS) will lower the trigger chances by ~12%. Higher penalty for mixed attack.
• Higher fleet total LoS (Line of Sight) will slightly increase the chances, around 5% ~ 10% per 100 additional FLoS. Notice that FLoS equals to the sum of LoS stats from all the ships in your fleet. Bonuses from equipment are included in the calculation.
• Equipment set up will affect the chances (see the table above)

Night Battle Special Attacks

Night battle special attacks allow your ship to double attack (DA) and cut-in (CI) at night. These special attacks are less demanding on the conditions, but more reliable and powerful than artillery spotting in the day.

Requirement

• Not in heavily damaged (大破) state
• Certain equipment setup (see below)

Set up and Attack Modes

Different set ups have chances to trigger different modes of attack. Attack modes are ONLY determined by the prerequisite. Also, feel free to add any auxiliary equipment (AP shell, seaplane, AA gun, etc.).on the remaining slots.

Attack Mode	Prerequisite	Notes on the Remaining Slots	Damage Modifier	Trigger Chance
Double Attack		No additional , or .	120% x 2	~99%
Double Attack		Additional allowed.	120% x 2	~99%
Double Attack		Additional or allowed.	120% x 2	~99%
Cut-In (Mixed)		Additional or allowed.	130% x 2 (consecutive)	Luck based
Cut-in (Sec. Gun)		No additional	175%	Luck based
Cut-in (Main Gun)		+ Any	200%	Luck based
Cut-in (Torpedo)		+ Any	150% x 2 (simultaneous)	Luck based

• When your set up fulfills the prerequisite for multiple attack modes, the one closer to the bottom of the list will be considered.
• If two simultaneous / consecutive attacks are made, the total damage is displayed together but the Damage Cap (and Enemy Armor reduction) is applied separately to each attack.
• When either DA or CI is not triggered by chance, the ship will just do a normal single attack.

Night Double Attack Chance

Has a very high (~99%) and relatively consistent activation chance (source). Activation rate decreases with damage states (source required), but is not dependent on luck. This typically results in more consistent and higher average damage than cut-in setup for ships with normal luck values.

Night Cut-in chance:

$(\text{Luck} + \text{Placement Modifier} + \text{Health Modifier} + \text{Searchlight Modifier} ) \%$

In the old formula, it was Luck *0.85.

• Either diminishing returns or a hard cap on luck over 50 for torpedo cut-ins. (source 1, 2)
  • Therefore, the torpedo CI chance for Yukikaze (60 luck) would be around the same level as Shigure (50 luck).
• Either diminishing returns or a hard cap on luck over 40 for three gun cut-ins. (source)
  • Therefore, ships with high luck will suffer from 5~10% lower cut-in chances when using the 3 gun cut-in setup compared to two-torpedo.
• Either diminishing returns or a hard cap on luck over 60 for mixed cut-ins (source 1, 2)

Modifier		Value
Placement	Flagship	(+25)
	Other	+15
Health	Little or no damage	0
	Minor damage (小破 Shouha)	(+5)
	Moderate damage (中破 Chuuha)	+20
Searchlight	Allied	+5
	Enemy	-10
Star Shell	Allied	+5
	Enemy	-10

• According to various reports, the exact values of flagship and minor damage modifiers are still in controversy. The mean values are shown in brackets, with deviation of +/- 5.

Anti-Sub Warfare

Any enemy submarines will force Destroyers and Light Cruisers to target them. It also applies to Aviation Heavy Cruisers, Aviation Battleships, Seaplane Tender, Light Carrier and Akitsumaru equipped with seaplane bombers, Ka-type Observation Autogyro or Type 3 Spotter/Liaison (ASW). Cut-In and Double Attacks are ignored. In normal Night Battles, ASW damage is scratch damage only. In battles starting at night, Formation Modifiers apply.

Common Setups

• Common ship equipment setups and their purpose
• Destroyers
  • As destroyers do not have the ability to field seaplanes, have low firepower but high torpedo stats, and few equipment slots, their use in fleets is generally to meet composition requirements. Their common setups focus on Anti-Sub Warfare, Night Torpedo, or Fleet Anti-Air Support
  • A Mixture of SONAR and Depth Charges () make your destroyers effective, accurate sub killers when enemy fleets contain Submarines.
  • On destroyers with high luck (Ayanami, Shigure, Yukikaze), 2 or 3 pieces of Torpedo Equipment () will often trigger a potent Torpedo Cut-In attack in Night Battle.
  • When facing maps with many enemy fleets with carriers, destroyers can provide a considerable amount of fleet AA support using high-angle mounts and anti-air cut-in setups to reduce incoming bomber damage.
  • On destroyers with low luck it is advisable to use 2 main guns + anything other than torpedoes or main gun, this will trigger Double Attack at night battles.
• Light Cruisers
  • Light Cruisers gain access to the Medium size Main guns to buff their firepower as well as seaplanes (with a few exceptions with regards to seaplanes, those being CLTs, Isuzu Kai Ni, Yuubari and both of the Tenryuu class), making Artillery Spotting setups feasible and effective against moderately armored enemy vessels.
  • For light cruisers facing enemy fleets, a setup with 2 Main guns and a Seaplane () offers a potent double attack in both daytime Artillery Spotting and Night Battle.
  • For fleets without air power, one medium main gun and two 15.5cm Triple Gun Mounts () will maximize firepower while maintaining double attacks in Night Battle
  • The special class of the Torpedo Cruisers deserves some mention here: their specialty lies in their torpedoes and should almost always be equipped with a Type A Ko-hyoteki (to enable opening torpedo strikes). To diversify their damage output, typically two medium main guns and/or 15.5cm Triple Gun Mounts are equipped to increase shelling damage and enable Night Battle Double Attacks ().
    • Before a Torpedo Cruiser's final remodel, due to limited slots it's advisable to use Type A Ko-hyoteki and a torpedo () to make the most of their preemptive attack.
• Heavy Cruisers
  • Heavy Cruisers see the introduction of 4 slot setups after remodeling and all of them feature the ability to launch seaplanes for artillery spotting. While they are still limited to the Medium main guns, their higher firepower and armor can make them solid combatants when Battleships are unavailable or overkill.
  • The go-to setup for most situations will be the 2 main guns, RADAR, seaplane setup () which provides day and night double attack potential.
  • Certain Event bosses take additional damage when a ship is equipped with Type 3 Shells. As heavy cruisers have access to these, a Heavy Cruiser may find swapping the RADAR for a Type 3 Shell () to be effective against such targets (see Airfield Princess).
  • In the case of a battle occurring with Night Battle first, one option is to replace the RADAR and seaplane with two torpedoes , which will lose the day battle special attacks but give the chance for powerful two-torpedo cut-in attacks.
• Battleships
  • Battleships feature a selection of Heavy Main Guns and massive resulting firepower in addition to the potent Armor Piercing shells which can cause brutal critical hits. Setups for battleships are similar to those of heavy cruisers, with one notable addition.
  • The Armor Piercing Shells that battleships have access to allows for the highly effective 2 Main gun, AP Shell, Seaplane setup () which has a more effective Artillery Spotting Cut-In, while providing better stats than secondary guns.
  • Note: Official tweets state that overuse of cannons larger than what a BB is meant for will make it "overweight" and incur a "minor" accuracy penalty. (I.e. Too many 46cm or even 41cm cannons on Fast Battleships such as Kongou-class and Bismarck.)
  • As with Heavy Cruisers, the Type 3 Shell setup () is effective against installation-type/land base enemies.
• Carriers
  • Planes. Enough Fighters to achieve Air Superiority or Supremacy, fill out with Torpedo Bombers on larger slots for preemptive bombing damage and/or Dive Bombers on smaller slots for shelling damage.
  • Torpedo Bombers and Dive Bombers are roughly equivalent to each other. While Torpedo Bombers have the advantage in the preemptive aerial bombing, their damage are dependent on number of surviving planes, making air superiority very important for them. In cases where Air Superiority is not feasible, using more Dive Bombers may prove more effective.
  • It is possible to equip Secondary Guns like the 15.5cm Triple Gun Mount or the special SCAMP to increase the carrier's range and put it higher in the Range Order shelling phase, which can be very useful for prioritizing the CV(L) damage when in a DD heavy fleet.
  • To save bauxite (especially in exercises against other fleets), a combination of two 15.5cm Triple Gun Mount and/or SCAMP with a Saiun and a single bomber in the 4th slot can allow powerful shelling attacks at the cost of opening airstrike potency ().

Overweight Penalty

Since a certain update, using main guns larger than what's fit for the ship class would incur certain level of accuracy penalty, For instance, using 41cm or above guns on Kongou-class. More researches need to be done to show to actual effect.

The penalty was first announced for Battleship-series' main gun and later extended to Light Cruiser.

Land-base Boss

Land-base bosses, also known as installation-type bosses, have a number of special properties:

• Land-base bosses cannot be targeted by torpedoes in day battle.
• Carriers with dive bombers equipped cannot target these enemies.
• In night battle, only the firepower portion of the (firepower + torpedo) attack power formula will be counted.
• Type 3 Shells give bonus damage against them, and are regarded as the main counter against the high armor these enemies often possess. The damage formula is Firepower × 2.5.
• WG42 similarly give a bonus in damage (Firepower x 2), but this equipment's effect overrides double and cut-in attacks.
• Instead of the usual lightly damaged (小破), moderately damaged (中破), heavily damaged (大破) and sunk (轟沈) indications, there is instead disordered (混乱), damaged (損害), destroyed (損壊) and demolished (破壊). Functionally, the two series of damage indications are equivalent.

Full Setup List

• What follows is an extensive list of possible equipment setups related to Artillery Spotting and Night Battle attacks.

• Yellow: Cut-In or Double Attack Possible

Two Slots

Equipment				Day Battle	Modifier	Night battle	Modifier
As no 2 slot setup can trigger special attacks during the day, 2 slot setups are primarily night combat focused.
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Double Attack	120% x 2
		-	-	Single Attack	100%	Double Attack	120% x 2
		-	-	Single Attack	100%	Cut-In (Mixed)	130% x 2
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Double Attack	120% x 2
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Cut-In (Torpedo)	150% x 2
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%
		-	-	Single Attack	100%	Single Attack	100%

Three Slots

Equipment				Day Battle	Modifier	Night battle	Modifier
Day Combat Focus
			-	Double Attack	120% x 2	Double Attack	120% x 2
			-	Cut-In	110%	Double Attack	120% x 2
			-	Single Attack	100%	Cut-In (Mixed)	130% x 2
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Double Attack	120% x 2
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Cut-In (Torpedo)	150% x 2
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
			-	Single Attack	100%	Single Attack	100%
Night Combat Focus
For Night Combat setups, see Day Combat 4 slot setups below and ignore the seaplane. The Day attack will be a Single Attack at 100%.

Four Slots

Equipment				Day Battle	Modifier	Night battle	Modifier
Day Combat Focus
				Double Attack	120% x 2	Cut-In (Gun)	200%
				Double or Cut-In	120% x 2 or 110%	Cut-In (Gun)	175%
				Double Attack	120% x 2	Cut-In (Mixed)	130% x 2
				Double Attack	120% x 2	Double Attack	120% x 2
				Double or Cut-In	120% x 2 or 150%	Double Attack	120% x 2
				Cut-In	110%	Double Attack	120% x 2
				Cut-In	110%	Cut-In (Mixed)	130% x 2
				Cut-In	120%	Double Attack	120% x 2
				Cut-In	130%	Double Attack	120% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Mixed)	130% x 2
				Single Attack	100%	Cut-In (Mixed)	130% x 2
				Single Attack	100%	Single Attack	100%
				Single Attack	100%	Single Attack	100%
				Single Attack	100%	Single Attack	100%
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
Night Combat Focus
				Single Attack	100%	Cut-In (Gun)	200%
				Single Attack	100%	Cut-In (Gun)	200%
				Single Attack	100%	Cut-In (Gun)	200%
				Single Attack	100%	Cut-In (Gun)	175%
				Single Attack	100%	Cut-In (Gun)	175%
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Cut-In (Mixed)	130% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Double Attack	120% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2
				Single Attack	100%	Cut-In (Torpedo)	150% x 2

Victory Conditions

Perfect S

• All enemy ships sunk and no damage taken.

S (Victory)

• All enemy ships sunk and no allied ships sunk.

A (Victory)

• Required number of enemy ships sunk (see below) and no allied ships sunk.

B (Tactical Victory)

• Sinking the enemy flagship guarantees at least a B as long as no allied ships are sunk.
• Enemy flagship sunk, friendly ship sunk and number of friendly ships sunk < number of enemy ships sunk.
• Damage gauge at least 2.5 times higher enemy damage gauge.
• This rate is the minimum requirement to clear maps without boss gauge.

C (Tactical Defeat)

• Didn't clear any of the conditions for A or B, but enemy took over a certain amount of damage.
• Damage gauge higher than enemy gauge, but not reaching 2.5 times as much.
• Friendly ship sunk, damage gauge higher than enemy, but not 2.5 times as much.
• Friendly ship sunk, enemy flagship sunk and number of friendly ships sunk lower than number of enemy ships sunk. It is possible to clear maps with boss gauges (eg. 4-4, 5-3, event maps) with a C if the enemy flagship is sunk.

D (Defeat)

• Enemy took less than a certain amount of damage.
  • Both sides taking 0 damage is also D.
  • If your fleet consist only 1 ship and it is reaching Heavy Damage without meeting any winning requirements, it will instantly judged as D as well.
• Damage gauge lower than enemy gauge.
• Friendly ship sunk, not all enemy ships sunk, and gauge lower than enemy gauge.

E (Defeat)

• Over a certain number of friendly ships sunk. (see below)
• Friendly ship sunk while not meeting any victory conditions.
• No damage done to enemy, while taking over a certain amount (Never happens in a fleet of 1).

Notes

• The Minimum Sunk Requirement:
  • 4 ships out of a fleet of 6
  • 3 ships out of a fleet of 5
  • 2 ships out of a fleet of 4
  • 2 ships out of a fleet of 3
  • 1 ship out of a fleet of 2
• Victory status affects the chance of getting drops and rare drops on the specified node.
  • B rank or above is necessary to obtain drops.
  • A rank or above is typically necessary for obtaining rare drops.
  • S rank has a higher chance of obtaining rare drops than A rank, and is required for some very rare drops.
    • Getting Perfect S in some occasion will double the drop rate that S rank wins already had, thus significantly increases the rate to rare drops.