Board Thread:Questions and Answers/@comment-27094620-20151020054444/@comment-7580628-20151020061028

there is no weakness between ship type really (unlike megaman games), but I can tell you this:

(VERY LONG PARAGRAPH HERE, SKIP TO SUMMARY IF U FEEL LAZY)

+ Standard Battleship is strong, pretty much can rekt every ships, however, they cant attack submarine but submarine can attack them! Meaning you can damage them without taking any dmg

+ Standard Carrier, Heavy Cruiser are like battleship, cant attack submarine but submarine can rekt them with no dmg done to them :v. Furthermore, you can make their CV become a sitting duck if either they ran out of bombing planes or they got chuuha (Except Taihou and Shoukaku, who are even more annoying because you need to rekt them to taiha to stop their shelling >_< )

+ However, Aviation Cruiser - Battleship / Light Carrier CAN attack submarine if they have bombers! Usually their ASW dmg are very suck but they have potentials to kill your submarine if they are in line abreast, and due to the aircraft profiency, their ASW dmg can crit your sub to death. Still, this maybe preferrable because they are forced to attack submarine at day! So if you use submarine as a decoy, your other surface ships can rekt them while they are being trolled by your submarine :D

+ Submarine, despite being able to take out large ships, cant really stand a hit from small ships. Destroyer, Light Cruiser and Torpedo Cruiser are very dangerous when it comes to ASW, and if they are in line abreast........you know it ! ...... =.=

+ On the other hand, Large ships (Battleship, Carrier, Heavy Cruiser) can take out small ships in no time, but they cant kill submarine

SUMMARY

there are no weakness, but i can say which ship type is effective to take out other ship types. Their circles should be like this

BB(V)/CV(L)/CA(V) * > DD/CL/CLT > SS > BB(V)/CV(L)/CA(V)

* : Plz note that BBV/CVL/CAV in line abreast with bombers vs your SS, either side will get rekt