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Weight Tweak Correction History, STC pass! #278

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Merged
ProgramciDusunur merged 2 commits into from
Mar 18, 2025
Merged

Weight Tweak Correction History, STC pass! #278

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f214823
an idea from Perseus engine
ProgramciDusunur Mar 17, 2025
8a1bf82
bench: 5216084
ProgramciDusunur Mar 17, 2025
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7 changes: 3 additions & 4 deletions src/search.c
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Original file line number Diff line number Diff line change
Expand Up @@ -264,7 +264,6 @@ void printMove(int move) {
}
}


int getLmrReduction(int depth, int moveNumber, bool isQuiet) {
return lmrTable[isQuiet][myMIN(63, depth)][myMIN(63, moveNumber)];
}
Expand All @@ -285,7 +284,7 @@ void updatePawnCorrectionHistory(board *position, const int depth, const int dif
int entry = pawnCorrectionHistory[position->side][pawnKey % CORRHIST_SIZE];

const int scaledDiff = diff * CORRHIST_GRAIN;
const int newWeight = myMIN(depth + 1, 16);
const int newWeight = 2 * myMIN(depth + 1, 16);

entry = (entry * (CORRHIST_WEIGHT_SCALE - newWeight) + scaledDiff * newWeight) / CORRHIST_WEIGHT_SCALE;
entry = clamp(entry, -CORRHIST_MAX, CORRHIST_MAX);
Expand All @@ -299,7 +298,7 @@ void updateMinorCorrectionHistory(board *position, const int depth, const int di
int entry = minorCorrectionHistory[position->side][minorKey % CORRHIST_SIZE];

const int scaledDiff = diff * CORRHIST_GRAIN;
const int newWeight = myMIN(depth + 1, 16);
const int newWeight = 2 * myMIN(depth + 1, 16);

entry = (entry * (CORRHIST_WEIGHT_SCALE - newWeight) + scaledDiff * newWeight) / CORRHIST_WEIGHT_SCALE;
entry = clamp(entry, -CORRHIST_MAX, CORRHIST_MAX);
Expand All @@ -312,7 +311,7 @@ void update_non_pawn_corrhist(board *position, const int depth, const int diff)
U64 blackKey = position->blackNonPawnKey;

const int scaledDiff = diff * CORRHIST_GRAIN;
const int newWeight = myMIN(depth + 1, 16);
const int newWeight = 2 * myMIN(depth + 1, 16);

int whiteEntry = nonPawnCorrectionHistory[white][position->side][whiteKey % CORRHIST_SIZE];

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