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Code Issues Releases Wiki Activity

Do Capture History Updates In Probcut

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This patch introduces history updates to probcut. Standard depth - 3 bonus and
maluses are given to the capture that caused fail high and previously searched
captures, respectively. Similar to #5243, a negative history fill is applied to
compensate for an increase in capture history average, thus improving the
scaling of this patch.

Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 84832 W: 21941 L: 21556 D: 41335
Ptnml(0-2): 226, 9927, 21688, 10386, 189
https://tests.stockfishchess.org/tests/view/6682fab9389b9ee542b1d029

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 104298 W: 26469 L: 26011 D: 51818
Ptnml(0-2): 43, 11458, 28677, 11940, 31
https://tests.stockfishchess.org/tests/view/6682ff06389b9ee542b1d0a0

closes https://github.com/official-stockfish/Stockfish/pull/5428

bench 1281351
This commit is contained in:
Shawn Xu 2024-06-30 22:04:51 -07:00 • committed by Joost VandeVondele
parent 6138a0fd0e
commit 69ad4667fb
1 changed files with 24 additions and 1 deletions
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25
src/search.cpp
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@ -502,7 +502,7 @@ void Search::Worker::iterative_deepening() {
void Search::Worker::clear() {
counterMoves.fill(Move::none());
mainHistory.fill(0);
captureHistory.fill(0);
captureHistory.fill(-700);
pawnHistory.fill(-1193);
correctionHistory.fill(0);
@ -862,12 +862,19 @@ Value Search::Worker::search(
assert(probCutBeta < VALUE_INFINITE && probCutBeta > beta);
MovePicker mp(pos, ttData.move, probCutBeta - ss->staticEval, &thisThread->captureHistory);
Move probcutCapturesSearched[32];
int probcutCaptureCount = 0;
Piece captured;
while ((move = mp.next_move()) != Move::none())
if (move != excludedMove && pos.legal(move))
{
assert(pos.capture_stage(move));
movedPiece = pos.moved_piece(move);
captured = pos.piece_on(move.to_sq());
// Prefetch the TT entry for the resulting position
prefetch(tt.first_entry(pos.key_after(move)));
@ -891,12 +898,28 @@ Value Search::Worker::search(
if (value >= probCutBeta)
{
thisThread->captureHistory[movedPiece][move.to_sq()][type_of(captured)]
<< stat_bonus(depth - 2);
for (int i = 0; i < probcutCaptureCount; i++)
{
movedPiece = pos.moved_piece(probcutCapturesSearched[i]);
captured = pos.piece_on(probcutCapturesSearched[i].to_sq());
thisThread->captureHistory[movedPiece][probcutCapturesSearched[i].to_sq()]
[type_of(captured)]
<< -stat_malus(depth - 3);
}
// Save ProbCut data into transposition table
ttWriter.write(posKey, value_to_tt(value, ss->ply), ss->ttPv, BOUND_LOWER,
depth - 3, move, unadjustedStaticEval, tt.generation());
return std::abs(value) < VALUE_TB_WIN_IN_MAX_PLY ? value - (probCutBeta - beta)
: value;
}
if (probcutCaptureCount < 32)
probcutCapturesSearched[probcutCaptureCount++] = move;
}
Eval::NNUE::hint_common_parent_position(pos, networks[numaAccessToken], refreshTable);