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Simplify Away Countermove Heuristic

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Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 977824 W: 252072 L: 252888 D: 472864
Ptnml(0-2): 2518, 117120, 250560, 116088, 2626
https://tests.stockfishchess.org/tests/view/6683452d95b0d1e881e81541

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 81048 W: 20630 L: 20470 D: 39948
Ptnml(0-2): 36, 8915, 22464, 9071, 38
https://tests.stockfishchess.org/tests/view/66886b7b0c9d7c1ab33ed281

closes https://github.com/official-stockfish/Stockfish/pull/5441

bench 1276784
This commit is contained in:
Shawn Xu
2024-07-01 17:08:22 -07:00
committed by Joost VandeVondele
parent daa9e217ab
commit a45c2bc34a
4 changed files with 5 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/search.cpp
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@@ -125,7 +125,7 @@ Value value_to_tt(Value v, int ply);
Value value_from_tt(Value v, int ply, int r50c);
void update_pv(Move* pv, Move move, const Move* childPv);
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus);
void update_refutations(const Position& pos, Stack* ss, Search::Worker& workerThread, Move move);
void update_refutations(Stack* ss, Move move);
void update_quiet_histories(
const Position& pos, Stack* ss, Search::Worker& workerThread, Move move, int bonus);
void update_quiet_stats(
@@ -510,7 +510,6 @@ void Search::Worker::iterative_deepening() {
}
void Search::Worker::clear() {
counterMoves.fill(Move::none());
mainHistory.fill(0);
captureHistory.fill(-700);
pawnHistory.fill(-1188);
@@ -950,11 +949,9 @@ moves_loop: // When in check, search starts here
nullptr,
(ss - 6)->continuationHistory};
Move countermove =
prevSq != SQ_NONE ? thisThread->counterMoves[pos.piece_on(prevSq)][prevSq] : Move::none();
MovePicker mp(pos, ttData.move, depth, &thisThread->mainHistory, &thisThread->captureHistory,
contHist, &thisThread->pawnHistory, countermove, ss->killers);
contHist, &thisThread->pawnHistory, ss->killers);
value = bestValue;
moveCountPruning = false;
@@ -1860,7 +1857,7 @@ void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
}
// Updates move sorting heuristics
void update_refutations(const Position& pos, Stack* ss, Search::Worker& workerThread, Move move) {
void update_refutations(Stack* ss, Move move) {
// Update killers
if (ss->killers[0] != move)
@@ -1868,13 +1865,6 @@ void update_refutations(const Position& pos, Stack* ss, Search::Worker& workerTh
ss->killers[1] = ss->killers[0];
ss->killers[0] = move;
}
// Update countermove history
if (((ss - 1)->currentMove).is_ok())
{
Square prevSq = ((ss - 1)->currentMove).to_sq();
workerThread.counterMoves[pos.piece_on(prevSq)][prevSq] = move;
}
}
void update_quiet_histories(
@@ -1893,7 +1883,7 @@ void update_quiet_histories(
void update_quiet_stats(
const Position& pos, Stack* ss, Search::Worker& workerThread, Move move, int bonus) {
update_refutations(pos, ss, workerThread, move);
update_refutations(ss, move);
update_quiet_histories(pos, ss, workerThread, move, bonus);
}