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simplify some extension conditions #340

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Merged
ProgramciDusunur merged 1 commit into from
Jul 2, 2025
Merged

simplify some extension conditions #340

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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 @@ -1176,7 +1176,7 @@ int negamax(int alpha, int beta, int depth, board* pos, time* time, bool cutNode
}

// Triple Extension
if (!getMoveCapture(currentMove) && singularScore + TRIPLE_EXTENSION_MARGIN < singularBeta) {
if (singularScore + TRIPLE_EXTENSION_MARGIN < singularBeta) {
extensions++;
}
// ╔═══════════════════════════╗
Expand Down Expand Up @@ -1205,8 +1205,7 @@ int negamax(int alpha, int beta, int depth, board* pos, time* time, bool cutNode

// Negative Extensions
else if (tt_score >= beta) {
extensions -= 1 + !pvNode;
cutNode = tt_score >= beta + DOUBLE_NEGATIVE_EXTENSION_MARGIN / 3;
extensions -= 1 + !pvNode;
// Double Negative Extension
if (!pvNode && tt_score >= beta + DOUBLE_NEGATIVE_EXTENSION_MARGIN) {
extensions -= 1;
Expand All @@ -1224,7 +1223,7 @@ int negamax(int alpha, int beta, int depth, board* pos, time* time, bool cutNode

// Cut Node Extension
else if (cutNode) {
extensions -= myMIN(depth / (SE_DEPTH * 2), 3);
extensions -= 2;
}
}

Expand Down