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Don't direct prune a move if it's a retake

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STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 36304 W: 9499 L: 9226 D: 17579
Ptnml(0-2): 96, 4102, 9508, 4325, 121
https://tests.stockfishchess.org/tests/view/61c7069ae68b2a714b6dca27

LTC:
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 93824 W: 24478 L: 24068 D: 45278
Ptnml(0-2): 70, 9644, 27082, 10038, 78
https://tests.stockfishchess.org/tests/view/61c725fee68b2a714b6dcfa2

closes https://github.com/official-stockfish/Stockfish/pull/3871

Bench: 4106806
This commit is contained in:
bmc4 2021-12-25 08:54:16 -03:00 • committed by Joost VandeVondele
parent 7d82f0d1f4
commit 93b14a17d1
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@ -1503,10 +1503,11 @@ moves_loop: // When in check, search starts here
// to search the moves. Because the depth is <= 0 here, only captures,
// queen promotions, and other checks (only if depth >= DEPTH_QS_CHECKS)
// will be generated.
Square prevSq = to_sq((ss-1)->currentMove);
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->captureHistory,
contHist,
to_sq((ss-1)->currentMove));
prevSq);
// Loop through the moves until no moves remain or a beta cutoff occurs
while ((move = mp.next_move()) != MOVE_NONE)
@ -1525,6 +1526,7 @@ moves_loop: // When in check, search starts here
// Futility pruning and moveCount pruning (~5 Elo)
if ( bestValue > VALUE_TB_LOSS_IN_MAX_PLY
&& !givesCheck
&& to_sq(move) != prevSq
&& futilityBase > -VALUE_KNOWN_WIN
&& type_of(move) != PROMOTION)
{