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Simplify usage of LMR for captures

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This patch simplifies a lot of "enablers" for LMR when move is a capture or promotion.
After it we will have only 2 conditions - if node is a cutNode
or if it's an allNode that was not in PV,
so all captures or promotions wouldn't go thru LMR at any PVnodes.

passed STC
https://tests.stockfishchess.org/tests/view/60a40117ce8ea25a3ef03ca7
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 58976 W: 4875 L: 4807 D: 49294
Ptnml(0-2): 176, 3897, 21270, 3973, 172

passed LTC
https://tests.stockfishchess.org/tests/view/60a43ff8ce8ea25a3ef03d18
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 65272 W: 2203 L: 2165 D: 60904
Ptnml(0-2): 28, 1936, 28668, 1978, 26

closes https://github.com/official-stockfish/Stockfish/pull/3480

bench 4110764
This commit is contained in:
Vizvezdenec 2021-05-19 20:57:04 +03:00 • committed by Joost VandeVondele
parent 6b9a70ace8
commit 2c3f7619f9
1 changed files with 1 additions and 4 deletions
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5
src/search.cpp
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@ -1121,11 +1121,8 @@ moves_loop: // When in check, search starts from here
if ( depth >= 3 if ( depth >= 3
&& moveCount > 1 + 2 * rootNode && moveCount > 1 + 2 * rootNode
&& ( !captureOrPromotion && ( !captureOrPromotion
|| moveCountPruning
|| ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
|| cutNode || cutNode
|| (!PvNode && !formerPv && captureHistory[movedPiece][to_sq(move)][type_of(pos.captured_piece())] < 3678) || (!PvNode && !formerPv))
|| thisThread->ttHitAverage < 432 * TtHitAverageResolution * TtHitAverageWindow / 1024)
&& (!PvNode || ss->ply > 1 || thisThread->id() % 4 != 3)) && (!PvNode || ss->ply > 1 || thisThread->id() % 4 != 3))
{ {
Depth r = reduction(improving, depth, moveCount); Depth r = reduction(improving, depth, moveCount);