Partials/Opening ASW

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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 Kai Ni D 85 97 102
Libeccio Kai 60 65 70 75 80 90 95 99 104 119 124
Satsuki Kai Ni 75 78 82 90 94 98 101 113 117
Asashimo Kai 66 70 75 79 84 93 97 102 106 120 124
Ushio Kai Ni 74 79 83 88 93 102 106 111 116 129 134
Верный 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
Shigure Kai Ni 83 87 92 97 102 112 116 121 126 141 145
Yuudachi Kai Ni
Murakumo Kai Ni
Hatsushimo Kai Ni
Mutsuki Kai Ni
87 92 97 102 107 116 121 126 131 145 150
Hatsuharu Kai Ni 87 92 97 102 107 117 122 127 132 148 153
Kisaragi Kai Ni 88 92 97 102 107 116 121 125 130 144 149
Fubuki Kai Ni 90 95 99 104 109 118 123 128 132 147 151
Kasumi Kai Ni 90 95 99 104 109 119 124 129 134 149 154
Akatsuki Kai Ni 94 99 105 110 115 126 131 136 141 N/A N/A
Ooshio Kai Ni 99 105 110 115 120 131 136 141 146 N/A N/A
Ayanami Kai Ni
Kawakaze Kai Ni
102 107 113 118 123 133 139 144 149 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 Kai Ni 75 80 86 91 108 113
Naka Kai Ni 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 Kai Ni 75 82 88 94 99 117 123
Kiso Kai Ni 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 Kai Ni 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 Kai Ni
Ooi Kai Ni
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 Kai Ni 72 77 83 88 94 105 110 116 121 138 143
Tenryuu Kai
Tatsuta Kai
88 93 97 102 106 115 119 124 129 141 146
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/A N/A N/A N/A