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Simplify ttmove reduction

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Remove condition that clamps reductions for tt move.

Passed STC:
https://tests.stockfishchess.org/tests/view/66d5f1239de3e7f9b33d14b0
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 91136 W: 23805 L: 23646 D: 43685
Ptnml(0-2): 334, 10328, 24066, 10525, 315

Passed LTC:
https://tests.stockfishchess.org/tests/view/66d7c5889de3e7f9b33d1721
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 139242 W: 35130 L: 35030 D: 69082
Ptnml(0-2): 78, 15200, 38986, 15258, 99

closes https://github.com/official-stockfish/Stockfish/pull/5574

Bench: 1268715
This commit is contained in:
Michael Chaly 2024-09-07 18:46:09 +03:00 • committed by Disservin
parent d7e3a708d4
commit a8cb002038
1 changed files with 2 additions and 3 deletions
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5
src/search.cpp
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@ -1148,10 +1148,9 @@ moves_loop: // When in check, search starts here
if ((ss + 1)->cutoffCnt > 3) if ((ss + 1)->cutoffCnt > 3)
r += 1 + allNode; r += 1 + allNode;
// For first picked move (ttMove) reduce reduction, but never allow // For first picked move (ttMove) reduce reduction (~3 Elo)
// reduction to go below 0 (~3 Elo)
else if (move == ttData.move) else if (move == ttData.move)
r = std::max(0, r - 2); r -= 2;
ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()] ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
+ (*contHist[0])[movedPiece][move.to_sq()] + (*contHist[0])[movedPiece][move.to_sq()]