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Assign negative stat bonuses for quiet moves at Pv nodes

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This patch assigns negative stat bonuses for quiet moves
at pv nodes which are searched at depth greater than
this node assumes, so are extended.

Passed STC:
https://tests.stockfishchess.org/tests/view/6426198bdb43ab2ba6f9cfa2
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 548944 W: 147287 L: 146254 D: 255403
Ptnml(0-2): 1662, 59772, 150671, 60605, 1762

Passed LTC:
https://tests.stockfishchess.org/tests/view/642be4f177ff3301150d892d
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 93352 W: 25400 L: 24994 D: 42958
Ptnml(0-2): 44, 8817, 28547, 9225, 43

closes https://github.com/official-stockfish/Stockfish/pull/4495

bench 5044536
This commit is contained in:
Michael Chaly 2023-04-05 05:48:34 +03:00 • committed by Joost VandeVondele
parent a2737d8bb5
commit 510aca1ef6
1 changed files with 4 additions and 1 deletions
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5
src/search.cpp
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@ -290,7 +290,7 @@ void Thread::search() {
bestValue = delta = alpha = -VALUE_INFINITE;
beta = VALUE_INFINITE;
optimism[us] = optimism[~us] = VALUE_ZERO;
optimism[WHITE] = optimism[BLACK] = VALUE_ZERO;
if (mainThread)
{
@ -1257,6 +1257,9 @@ moves_loop: // When in check, search starts here
(ss+1)->pv[0] = MOVE_NONE;
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, false);
if (moveCount > 1 && newDepth >= depth && !capture)
update_continuation_histories(ss, movedPiece, to_sq(move), -stat_bonus(newDepth));
}
// Step 19. Undo move