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Simplify Fail Low Bonus Formula

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Tested against PR #5299

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 76352 W: 19797 L: 19619 D: 36936
Ptnml(0-2): 236, 9017, 19509, 9161, 253
https://tests.stockfishchess.org/tests/view/66564f60a86388d5e27dd307

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 114624 W: 28946 L: 28821 D: 56857
Ptnml(0-2): 59, 12675, 31714, 12810, 54
https://tests.stockfishchess.org/tests/view/6656543da86388d5e27dd329

closes https://github.com/official-stockfish/Stockfish/pull/5301

Bench: 1212167
This commit is contained in:
Shawn Xu 2024-05-28 14:31:56 -07:00 • committed by Disservin
parent a2f4e988aa
commit ae7eef51fd
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1341,7 +1341,7 @@ moves_loop: // When in check, search starts here
// Bonus for prior countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonus = (54 * (depth > 4) + 62 * (depth > 5) + 115 * (PvNode || cutNode)
int bonus = (116 * (depth > 5) + 115 * (PvNode || cutNode)
+ 186 * ((ss - 1)->statScore < -14144) + 121 * ((ss - 1)->moveCount > 9)
+ 64 * (!ss->inCheck && bestValue <= ss->staticEval - 115)
+ 137 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 81));