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Don't attempt probcut if ttMove is not good enough.

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This idea is loosely based on xoroshiro idea about raisedBeta and ttmoves.
If our ttmove have low enough ttvalue and is deep enough (deeper than our probcut depth) it makes little sense to try probcut moves, since the ttMove already more or less failed to produce one according to transposition table.

passed STC
https://tests.stockfishchess.org/tests/view/5e9673ddc2718dee3c822920
LLR: 2.95 (-2.94,2.94) {-0.50,1.50}
Total: 72148 W: 14038 L: 13741 D: 44369
Ptnml(0-2): 1274, 8326, 16615, 8547, 1312

passed LTC
https://tests.stockfishchess.org/tests/view/5e96b378c2718dee3c8229bf
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 89054 W: 11418 L: 10996 D: 66640
Ptnml(0-2): 623, 8113, 26643, 8515, 633

closes https://github.com/official-stockfish/Stockfish/pull/2632

bench 4952731
This commit is contained in:
Vizvezdenec 2020-04-15 18:22:02 +03:00 • committed by Joost VandeVondele
parent ca4e399ea6
commit 0e51ff1074
1 changed files with 6 additions and 2 deletions
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8
src/search.cpp
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@ -906,8 +906,12 @@ namespace {
MovePicker mp(pos, ttMove, raisedBeta - ss->staticEval, &captureHistory);
int probCutCount = 0;
while ( (move = mp.next_move()) != MOVE_NONE
&& probCutCount < 2 + 2 * cutNode)
while ( (move = mp.next_move()) != MOVE_NONE
&& probCutCount < 2 + 2 * cutNode
&& !( move == ttMove
&& (tte->bound() & BOUND_LOWER)
&& tte->depth() >= depth - 4
&& ttValue < raisedBeta))
if (move != excludedMove && pos.legal(move))
{
assert(pos.capture_or_promotion(move));