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Reduce When TTValue is Above Alpha
Passed STC: LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 53376 W: 13818 L: 13476 D: 26082 Ptnml(0-2): 156, 6212, 13626, 6522, 172 https://tests.stockfishchess.org/tests/view/664aa261830eb9f8866145e5 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 393444 W: 100096 L: 99042 D: 194306 Ptnml(0-2): 191, 43516, 108248, 44582, 185 https://tests.stockfishchess.org/tests/view/664ab54f830eb9f88661463c closes https://github.com/official-stockfish/Stockfish/pull/5276 Bench: 1024562
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@ -42,6 +42,7 @@
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#include "thread.h"
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#include "timeman.h"
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#include "tt.h"
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#include "types.h"
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#include "uci.h"
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#include "ucioption.h"
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@ -833,9 +834,12 @@ Value Search::Worker::search(
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if (PvNode && !ttMove)
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depth -= 3;
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if (!PvNode && ss->ttHit && (tte->bound() & BOUND_UPPER) && ttValue > alpha + 5 * depth)
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depth--;
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// Use qsearch if depth <= 0.
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if (depth <= 0)
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return qsearch<PV>(pos, ss, alpha, beta);
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return qsearch < PvNode ? PV : NonPV > (pos, ss, alpha, beta);
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// For cutNodes without a ttMove, we decrease depth by 2 if depth is high enough.
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if (cutNode && depth >= 8 && (!ttMove || tte->bound() == BOUND_UPPER))
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