Partials/Opening ASW

The opening anti-submarine attack (OASW) can be performed by any ship with displayed ASW value of 100 or greater (ship's ASW stat + equipment ASW, not counting equipment improvements) and at least one sonar.

• Isuzu Kai Ni is an exception and can always perform the opening anti-submarine attack, even with less than 100 displayed ASW or without any ASW equipment.
• If several ships fulfill the requirements, then they all can perform preemptive attacks, each attacking a random submarine in the enemy fleet. The firing order is determined by the range order, similar to the First Shelling Phase. The order for ships of the same range is random.
• The damage follows the usual ASW formula and is affected by the usual modifiers (formation, engagement, health, ammo), as well as equipment improvements.

The following tables show how much base ASW is needed (in form of required ship level) to enable OASW with a given equipment setup (T4: Type 4 Passive Sonar, T3: Type 3 Active Sonar, DC: Type 3 Depth Charge Projector).

DD
Ship	3 Slots					2 Slots				1 Slot
	T4/T4/T4 36 + 64	T4/T4/T3 34 + 66	T4/T4/DC 32 + 68	T4/T3/DC 30 + 70	T3/T3/DC 28 + 72	T4/T4 24 + 76	T4/T3 22 + 78	T4/DC 20 + 80	T3/DC 18 + 82	T4 12 + 88	T3 10 + 90
Asashio K2D	85									97	102
Libeccio Kai	60	65	70	75	80	90	95	99	104	119	124
Satsuki K2	75			78	82	90	94	98	101	113	117
Asashimo Kai	66	70	75	79	84	93	97	102	106	120	124
Ushio K2	74	79	83	88	93	102	106	111	116	129	134
ВерныйВерный	77	81	86	90	95	104	108	113	117	131	135
Akizuki Kai Teruzuki Kai Hatsuzuki Kai	81	85	90	95	99	109	114	118	123	137	142
Harukaze Kai	84	88	92	96	99	107	111	115	119	131	135
Matsukaze Kai	76	84	92	99	107	123	131	139	147	N/A	N/A
Shigure K2	83	87	92	97	102	112	116	121	126	141	145
Kamikaze Kai	87	91	95	99	104	112	117	121	125	138	143
Yuudachi K2 Murakumo K2 Hatsushimo K2 Mutsuki K2	87	92	97	102	107	116	121	126	131	145	150
Hatsuharu K2	87	92	97	102	107	117	122	127	132	148	153
Kisaragi K2	88	92	97	102	107	116	121	125	130	144	149
Fubuki K2	90	95	99	104	109	118	123	128	132	147	151
Kasumi K2	90	95	99	104	109	119	124	129	134	149	154
Asakaze Kai	92	96	99	103	107	115	119	123	127	139	143
Akatsuki K2	94	99	105	110	115	126	131	136	141	N/A	N/A
Ooshio K2	99	105	110	115	120	131	136	141	146	N/A	N/A
Ayanami K2 Kawakaze K2	102	107	113	118	123	133	139	144	149	N/A	N/A
Arashio K2	114	120	126	132	138	150	N/A	N/A	N/A	N/A	N/A
Shimakaze Kai Yukikaze Kai	115	121	127	134	140	152	N/A	N/A	N/A	N/A	N/A

CL/CLT
Ship	3 Slots					2 Slots				1 Slot
	T4/T4/T4 36 + 64	T4/T4/T3 34 + 66	T4/T4/DC 32 + 68	T4/T3/DC 30 + 70	T3/T3/DC 28 + 72	T4/T4 24 + 76	T4/T3 22 + 78	T4/DC 20 + 80	T3/DC 18 + 82	T4 12 + 88	T3 10 + 90
Kinu K2	75						80	86	91	108	113
Naka K2	48	50	55	61	66	77	83	88	94	110	116
Sakawa Kai	63	66	70	74	77	85	88	92	96	107	110
Abukuma K2	75					82	88	94	99	117	123
Kiso K2	65	68	72	76	80	88	92	96	99	111	115
Agano Kai Noshiro Kai Yahagi Kai	68	71	75	78	82	89	92	96	99	110	114
Jintsuu K2	60	65	70	75	80	90	95	99	104	119	124
Yura Kai	52	58	64	71	77	90	96	103	109	128	135
Kitakami K2 Ooi K2	71	75	79	82	86	94	98	101	105	117	120
Kuma Kai Tama Kai Natori Kai	72	76	80	83	87	94	98	101	105	116	119
Sendai K2	72	77	83	88	94	105	110	116	121	138	143
Tenryuu Kai Tatsuta Kai	88	93	97	102	106	115	119	12|} tout mw-collapsible " style="width:100%;text-align:center;" 4 Slots CL/CT Ship 4 Slots T4/T4/T4/T4 48 + 52 T4/T4/T4/T3 46 + 54 T4/T4/T4/DC 44 + 56 T4/T4/T3/DC 42 + 58 T4/T3/T3/DC 40 + 60 T3/T3/T3/DC 38 + 62 Yuubari Kai Kashima Kai 62 66 71 75 80 84 Katori Kai 75 80 85 90 95 99 Ooyodo Kai 132 138 143 148 153 N/A Ship 3 Slots T4/T4/T4 36 + 64 T4/T4/T3 34 + 66 T4/T4/DC 32 + 68 T4/T3/DC 30 + 70 T3/T3/DC 28 + 72 Yuubari Kai Kashima Kai 88 93 97 102 106 Katori Kai 104 109 114 119 124 Ooyodo Kai N/A N/A N/A N/A N/A Ship 2 Slots 1 Slot T4/T4 24 + 76 T4/T3 22 + 78 T4/DC 20 + 80 T3/DC 18 + 82 T4 12 + 88 T3 10 + 90 Yuubari Kai Kashima Kai 115 119 124 129 141 146 Katori Kai 134 139 144 149 N/A N/A Ooyodo Kai N/A N/A N/|}