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Code Issues Releases Wiki Activity

Do more full window searches

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Remove the value < beta condition for doing full window searches.
As an added bonus the condition for full-window search is now much
more similar to other fail-soft engines.

Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 244608 W: 62286 L: 62294 D: 120028
Ptnml(0-2): 758, 28772, 63214, 28840, 720
https://tests.stockfishchess.org/tests/view/64d72d365b17f7c21c0e6675

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 311460 W: 78909 L: 78985 D: 153566
Ptnml(0-2): 129, 33959, 87656, 33831, 155
https://tests.stockfishchess.org/tests/view/64dca2265b17f7c21c0ee06c

closes https://github.com/official-stockfish/Stockfish/pull/4755

Bench: 1624221
This commit is contained in:
cj5716 2023-08-12 14:56:23 +08:00 • committed by Stéphane Nicolet
parent c6f62363a6
commit 030b87182a
1 changed files with 3 additions and 4 deletions
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7
src/search.cpp
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@ -1211,10 +1211,9 @@ moves_loop: // When in check, search starts here
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth - (r > 3), !cutNode); value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth - (r > 3), !cutNode);
} }
// For PV nodes only, do a full PV search on the first move or after a fail // For PV nodes only, do a full PV search on the first move or after a fail high,
// high (in the latter case search only if value < beta), otherwise let the // otherwise let the parent node fail low with value <= alpha and try another move.
// parent node fail low with value <= alpha and try another move. if (PvNode && (moveCount == 1 || value > alpha))
if (PvNode && (moveCount == 1 || (value > alpha && (rootNode || value < beta))))
{ {
(ss+1)->pv = pv; (ss+1)->pv = pv;
(ss+1)->pv[0] = MOVE_NONE; (ss+1)->pv[0] = MOVE_NONE;