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===Fleet Anti-Air Defense (new formula)===
'''Note: The formula for this section is for the player's side. The formula for abyssal ships is strongly suggested to be different.'''
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.
*Fighters {{GreenPlane}} are not subject to AA fire from ships.
*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.
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''.
*Both shootdowns have 50% chance to succeed; failing means no planes are shot down for that part of the calculation.
*Percentage shootdown will be done prior to anti-air cut-in and fixed shootdown calculation.
*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)
''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>
Fleet Anti-Air Bonus is currently suggested to only apply to ''fixed shootdown'' calculation.
For each ship, the formula for its weighted anti-air value is calculated as follows:
<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>
</center>
where equipment multiplier is shown in the table below:
{| class="wikitable"
|-
! scope="col" style="text-align:center;" |Equipment Type
! scope="col" style="text-align:center;" |Equipment Modifier
|-
| High-Angle Gun Mount {{GreenGunDP}}<br>(Both Main and secondary)
| style="text-align:center;" |x4
|-
| Autocannon {{GreenGunMG}}
| style="text-align:center;" |x6
|-
| Anti-Air RADAR {{Radar}}
| style="text-align:center;" |x3
|-
| Anti-Aircraft Fire Director {{AntiAircraftFireDirector}}
| style="text-align:center;" |x4
|}
Multipliers for equipment not listed are not confirmed at this time.
<math>\text {Percentage Shootdown (in percent)} = \text {Weighted Anti-Air Value} \div 400</math><br>
*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)
<math>\text {Fixed Shootdown (in # of planes)} = \text {Floor(Weighted Anti-Air Value} \div 10 \text{)}</math>
====Example of shootdown calculation====
[[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>
<math>\text {Akizuki's Weighted AA Value} = 116 + 4 \times (10 + 0.7 \times \sqrt(6) ) \times 2 + 3 \times 4 = 221</math><br>
Thus, the values for the shootdown are calculated as follows:<br>
<math>\text {Akizuki's percentage shootdown} = 221 \div 400 = 0.55 = 55 \%</math><br>
<math>\text {Akizuki's fixed shootdown} = \text{Floor(} 221 \div 10 \text{)} = 22</math><br>
The shootdown takes place in the order of percentage, then fixed, then guaranteed, so there are 4 possible outcomes:
{| class="wikitable"
|-
! scope="col" style="text-align:center;" |Which Shootdown successful?
! scope="col" style="text-align:center;" |Shootdown calculation
! scope="col" style="text-align:center;" |Aircraft Carrier Princess's<br>Remaining Torpedo Bombers
|-
| Both Percentage and Fixed Shootdown
| style="text-align:center;" |56x50% (percentage) + 22 (fixed) + 1 (guaranteed)<br>= 30 + 22 + 1 = 53
| style="text-align:center;" |3
|-
| Percentage Shootdown Only
| style="text-align:center;" |56x50% (percentage) + 1 (guaranteed)<br>= 30 + 1 = 31
| style="text-align:center;" |25
|-
| Fixed Shootdown Only
| style="text-align:center;" |22 (fixed) + 1 (guaranteed) = 23
| style="text-align:center;" |33
|-
| Neither
| style="text-align:center;" |1 (guaranteed)
| style="text-align:center;" |55
|}
[[Category:Game Mechanics]]
[[Category:Game Mechanics]]