Add extra bonuses to some moves that forced a fail low

The previous patch on this idea was giving bonuses to this moves if best value of search is far below current static evaluation.
This patch does similar thing but adds extra bonus when best value of search is far below static evaluation before previous move.

Passed STC:
https://tests.stockfishchess.org/tests/view/66355fc819566d64b481d6a4
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 454144 W: 116575 L: 115656 D: 221913
Ptnml(0-2): 1060, 53410, 117215, 54325, 1062

Passed LTC:
https://tests.stockfishchess.org/tests/view/6635c61a73559a8aa858012d
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 136578 W: 34858 L: 34335 D: 67385

closes https://github.com/official-stockfish/Stockfish/pull/5209

Bench: 1614825
This commit is contained in:
Michael Chaly
2024-05-04 10:33:26 +03:00
committed by Joost VandeVondele
parent 8ee9905d8b
commit 351a2e22dd

View File

@@ -1335,8 +1335,8 @@ moves_loop: // When in check, search starts here
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonus = (depth > 5) + (PvNode || cutNode) + ((ss - 1)->statScore < -14761)
+ ((ss - 1)->moveCount > 11)
+ (!ss->inCheck && bestValue <= ss->staticEval - 142);
+ ((ss - 1)->moveCount > 11) + (!ss->inCheck && bestValue <= ss->staticEval - 142)
+ (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 77);
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
stat_bonus(depth) * bonus);
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()]