Unlike most standard Abyssals, PT-Imp Packs are very small and fast.
- All ship types suffer a severe
 accuracy and  firepower penalty against PT-Imp.
- Attacking them with larger guns is not very effective, smaller guns being recommended instead.
The Accuracy formula against PT-IMPs:[1][2][3][4]
- [math]\displaystyle{ \text{Hit Rate}_\text{vs.PT} \text{%} = \Big\lfloor \big\lfloor \lfloor \text{Accuracy}_\text{Standard} + \text{Mod}_\text{Amagiri} \rfloor \times \text{Mod}_\text{Formation} \times \text{Mod}_\text{Fatigue} \times \text{Mod}_\text{PT} \times \text{Mod}_\text{Add} \big\rfloor \times \text{Mod}_\text{Ship} \times \text{Mod}_\text{Equipment} \times \text{Mod}_\text{Night} \Big\rfloor - \text{EVA}_\text{PT} + 1 }[/math]
With:
- [math]\displaystyle{ \text{Accuracy}_\text{Standard} }[/math] is the standard accuracy described here
- PT-Imps are "DDs" in the game, so the [math]\displaystyle{ \text{Mod}_\text{formation} }[/math] for vanguard is 0.88/1.32 for the top and bottom halves respectively.
- Historical accuracy bonuses during Events is included in the Standard Accuracy Term, i.e. it is affected by the 0.42x modifier.
- [math]\displaystyle{ \text{Mod}_\text{Amagiri} }[/math] is:
- [math]\displaystyle{ \text{Mod}_\text{Formation} }[/math] is the Acc mod of each formation (see here),
- [math]\displaystyle{ \text{Mod}_\text{Fatigue} }[/math] are the morale effects (see here)
- [math]\displaystyle{ \text{Mod}_\text{PT} }[/math] is 0.42 (0.35 x 1.2),
- [math]\displaystyle{ \text{Mod}_\text{Add} }[/math] is 24 (15 x 1.2),
- [math]\displaystyle{ \text{Mod}_\text{Night} }[/math] is 0.7 during night battle, 1 during day battle.
- [math]\displaystyle{ \text{EVA}_\text{PT} }[/math] is ??
- [math]\displaystyle{ \text{Mod}_\text{Ship} }[/math] is the bonus given by ship types, described below,
- [math]\displaystyle{ \text{Mod}_\text{Equipment} }[/math] is the bonus given by equipment, described below,
- When several equipment are used on a ship, it is then the product of those bonuses.
| Ship Type |
[math]\displaystyle{ \text{Mod}_\text{Ship} }[/math]
|
| DD & DE |
1.0
|
| CL, CLT, & CT |
0.82
|
| All other types |
0.7
|
Notes:
- It is recommended to use anti-PT setups on DDs only, such setups compromising overall combat effectiveness.
- Having a Reinforcement Expansion is important because it can save a ship slot by containing a machine gun or skilled lookouts.
- Combining equipment is recommended to see significant boosts to accuracy.
- Using other setups improving accuracy is also advisable:
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