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Simplify late countermove bonus condition

Browse source 
STC: https://tests.stockfishchess.org/tests/view/63d53ac6a67dd929a555e1e2
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 216096 W: 56862 L: 56839 D: 102395
Ptnml(0-2): 648, 24033, 58650, 24082, 635

LTC: https://tests.stockfishchess.org/tests/view/63d7f9a6a67dd929a5565991
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 808512 W: 214060 L: 214610 D: 379842
Ptnml(0-2): 301, 79448, 245293, 78928, 286

closes https://github.com/official-stockfish/Stockfish/pull/4392

Bench: 4283297
This commit is contained in:
Dubslow 2023-01-22 19:45:46 -06:00 • committed by Joost VandeVondele
parent 29c1e072b6
commit 085cace457
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -1371,11 +1371,10 @@ moves_loop: // When in check, search starts here
quietsSearched, quietCount, capturesSearched, captureCount, depth);
// Bonus for prior countermove that caused the fail low
else if ( (depth >= 5 || PvNode || bestValue < alpha - 65 * depth)
&& !priorCapture)
else if (!priorCapture)
{
// Extra bonuses for PV/Cut nodes or bad fail lows
int bonus = 1 + (PvNode || cutNode) + (bestValue < alpha - 88 * depth);
int bonus = (depth > 4) + (PvNode || cutNode) + (bestValue < alpha - 88 * depth);
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, stat_bonus(depth) * bonus);
}