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===Fleet Anti-Air Defense (new formula)===
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'''Note: The formula for this section is for the player's side. The formula for abyssal ships is strongly suggested to be different.'''
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After plane loss from fighter combat is calculated, for each enemy bomber slot ({{Seaplane}} / {{RedPlane}} / {{BluePlane}}), a random ship (''defending ship'') is assigned to defend against that slot via AA fire.
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*Fighters {{GreenPlane}} are not subject to AA fire from ships.
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*The ship performing AA fire is not necessarily the same ship that the bomber will attack; the ship performing AA fire may not even be a surface ship.
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The defending ship's '''weighted anti-air value''' will be used in calculations for two types of anti-air shootdowns: ''percentage shootdown'' and ''fixed shootdown''.
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*Both shootdowns have 50% chance to succeed; failing means no planes are shot down for that part of the calculation.
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*Percentage shootdown will be done prior to anti-air cut-in and fixed shootdown calculation.
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*Friendly units additionally get a guaranteed shootdown of 1 plane (per slot) after the percentage/fixed shootdowns; this applies even if both percentage shootdown and fixed shootdown fail. (Enemy fleet does not get this 1-plane guarantee)
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''There was a bug causing the formation anti-air modifier and fleet anti-air bonus to not function; this was fixed on June 26, 2015.''<br>
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Fleet Anti-Air Bonus is currently suggested to only apply to ''fixed shootdown'' calculation.
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For each ship, the formula for its weighted anti-air value is calculated as follows:
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<center><math>\text {Weighted Anti-Air Value} = \text{Ship's Innate Anti-Air Value} + \sum^\text{All equipment slots in fleet} \text{[ Equipment Multiplier} \times { \text {Equipment's Anti-Air Value} + 0.7 \times \sqrt{\text{Equipment's Improvement Level}} } \text{ ]}</math>
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</center>
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where equipment multiplier is shown in the table below:
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{| class="wikitable"
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|-
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! scope="col" style="text-align:center;" |Equipment Type
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! scope="col" style="text-align:center;" |Equipment Modifier
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|-
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| High-Angle Gun Mount {{GreenGunDP}}<br>(Both Main and secondary)
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| style="text-align:center;" |x4
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|-
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| Autocannon {{GreenGunMG}}
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| style="text-align:center;" |x6
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|-
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| Anti-Air RADAR {{Radar}}
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| style="text-align:center;" |x3
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|-
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| Anti-Aircraft Fire Director {{AntiAircraftFireDirector}}
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| style="text-align:center;" |x4
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|}
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Multipliers for equipment not listed are not confirmed at this time.
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<math>\text {Percentage Shootdown (in percent)} = \text {Weighted Anti-Air Value} \div 400</math><br>
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*Alternative suggestion of <math>\text {Percentage Shootdown (in # of planes)} = \text{Floor(Weighted Anti-Air Value} \times 0.9 \text{)} \div 360 \times \text{Number of Planes in Slot}</math> exists)
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<math>\text {Fixed Shootdown (in # of planes)} = \text {Floor(Weighted Anti-Air Value} \div 10 \text{)}</math>
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====Example of shootdown calculation====
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[[Akizuki]] (Innate AA value of 116, equipped with two [[10cm Twin High-angle Mount + Anti-Aircraft Fire Director|10cm HA+FD *+6]] and an [[Type 13 Air RADAR Kai]]) is defending against [[Aircraft Carrier Princess]]'s torpedo bomber slot (with 56 planes). Ignoring all other contributing factors such as Anti-Air Cut-In, fighter combat, and bonus from other members in fleet,<br>
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<math>\text {Akizuki's Weighted AA Value} = 116 + 4 \times (10 + 0.7 \times \sqrt(6) ) \times 2 + 3 \times 4 = 221</math><br>
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Thus, the values for the shootdown are calculated as follows:<br>
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<math>\text {Akizuki's percentage shootdown} = 221 \div 400 = 0.55 = 55 \%</math><br>
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<math>\text {Akizuki's fixed shootdown} = \text{Floor(} 221 \div 10 \text{)} = 22</math><br>
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The shootdown takes place in the order of percentage, then fixed, then guaranteed, so there are 4 possible outcomes:
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{| class="wikitable"
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|-
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! scope="col" style="text-align:center;" |Which Shootdown successful?
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! scope="col" style="text-align:center;" |Shootdown calculation
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! scope="col" style="text-align:center;" |Aircraft Carrier Princess's<br>Remaining Torpedo Bombers
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|-
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| Both Percentage and Fixed Shootdown
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| style="text-align:center;" |56x50% (percentage) + 22 (fixed) + 1 (guaranteed)<br>= 30 + 22 + 1 = 53
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| style="text-align:center;" |3
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|-
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| Percentage Shootdown Only
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| style="text-align:center;" |56x50% (percentage) + 1 (guaranteed)<br>= 30 + 1 = 31
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| style="text-align:center;" |25
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|-
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| Fixed Shootdown Only
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| style="text-align:center;" |22 (fixed) + 1 (guaranteed) = 23
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| style="text-align:center;" |33
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|-
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| Neither
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| style="text-align:center;" |1 (guaranteed)
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| style="text-align:center;" |55
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|}
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[[Category:Game Mechanics]]
 
[[Category:Game Mechanics]]
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