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Code Issues Releases Wiki Activity

Remove Killer Heuristic In Move Ordering

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Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80480 W: 20979 L: 20802 D: 38699
Ptnml(0-2): 279, 9610, 20337, 9683, 331
https://tests.stockfishchess.org/tests/view/669c12c14ff211be9d4ec69b

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77988 W: 19788 L: 19624 D: 38576
Ptnml(0-2): 66, 8605, 21481, 8783, 59
https://tests.stockfishchess.org/tests/view/669d628a4ff211be9d4ec7a8

closes https://github.com/official-stockfish/Stockfish/pull/5511

bench 1367740
This commit is contained in:
Shawn Xu 2024-07-20 12:40:16 -07:00 • committed by Joost VandeVondele
parent 1e2f051103
commit 985b9fd7b0
3 changed files with 4 additions and 9 deletions
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6
src/movepick.cpp
View file

@ -86,15 +86,13 @@ MovePicker::MovePicker(const Position& p,
const ButterflyHistory* mh,
const CapturePieceToHistory* cph,
const PieceToHistory** ch,
const PawnHistory* ph,
Move km) :
const PawnHistory* ph) :
pos(p),
mainHistory(mh),
captureHistory(cph),
continuationHistory(ch),
pawnHistory(ph),
ttMove(ttm),
killer(km),
depth(d) {
if (pos.checkers())
@ -164,8 +162,6 @@ void MovePicker::score() {
m.value += (*continuationHistory[3])[pc][to];
m.value += (*continuationHistory[5])[pc][to];
m.value += (m == killer) * 65536;
// bonus for checks
m.value += bool(pos.check_squares(pt) & to) * 16384;

5
src/movepick.h
View file

@ -159,8 +159,7 @@ class MovePicker {
const ButterflyHistory*,
const CapturePieceToHistory*,
const PieceToHistory**,
const PawnHistory*,
Move killer = Move::none());
const PawnHistory*);
MovePicker(const Position&, Move, int, const CapturePieceToHistory*);
Move next_move(bool skipQuiets = false);
@ -177,7 +176,7 @@ class MovePicker {
const CapturePieceToHistory* captureHistory;
const PieceToHistory** continuationHistory;
const PawnHistory* pawnHistory;
Move ttMove, killer;
Move ttMove;
ExtMove * cur, *endMoves, *endBadCaptures, *beginBadQuiets, *endBadQuiets;
int stage;
int threshold;

2
src/search.cpp
View file

@ -907,7 +907,7 @@ moves_loop: // When in check, search starts here
MovePicker mp(pos, ttData.move, depth, &thisThread->mainHistory, &thisThread->captureHistory,
contHist, &thisThread->pawnHistory, ss->killer);
contHist, &thisThread->pawnHistory);
value = bestValue;