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Capture Stat Tweak

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Penalize capture moves that fail to create a cutoff even at quiet move cutoff.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 19004 W: 4284 L: 4059 D: 10661
http://tests.stockfishchess.org/tests/view/5b3a7d4d0ebc5902b9ffb6ea

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 23100 W: 3981 L: 3765 D: 15354
http://tests.stockfishchess.org/tests/view/5b3aa4550ebc5902b9ffb8cf

Closes https://github.com/official-stockfish/Stockfish/pull/1664

Bench: 5232010
This commit is contained in:
VoyagerOne 2018-07-04 01:11:54 +02:00 • committed by Stéphane Nicolet
parent e7cfa5d020
commit 3279655f12
1 changed files with 5 additions and 3 deletions
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4
src/search.cpp
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@ -1155,7 +1155,7 @@ moves_loop: // When in check, search starts from here
if (!pos.capture_or_promotion(bestMove)) if (!pos.capture_or_promotion(bestMove))
update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount, update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount,
stat_bonus(depth + (bestValue > beta + PawnValueMg ? ONE_PLY : DEPTH_ZERO))); stat_bonus(depth + (bestValue > beta + PawnValueMg ? ONE_PLY : DEPTH_ZERO)));
else
update_capture_stats(pos, bestMove, capturesSearched, captureCount, stat_bonus(depth + ONE_PLY)); update_capture_stats(pos, bestMove, capturesSearched, captureCount, stat_bonus(depth + ONE_PLY));
// Extra penalty for a quiet TT move in previous ply when it gets refuted // Extra penalty for a quiet TT move in previous ply when it gets refuted
@ -1448,6 +1448,8 @@ moves_loop: // When in check, search starts from here
CapturePieceToHistory& captureHistory = pos.this_thread()->captureHistory; CapturePieceToHistory& captureHistory = pos.this_thread()->captureHistory;
Piece moved_piece = pos.moved_piece(move); Piece moved_piece = pos.moved_piece(move);
PieceType captured = type_of(pos.piece_on(to_sq(move))); PieceType captured = type_of(pos.piece_on(to_sq(move)));
if (pos.capture_or_promotion(move))
captureHistory[moved_piece][to_sq(move)][captured] << bonus; captureHistory[moved_piece][to_sq(move)][captured] << bonus;
// Decrease all the other played capture moves // Decrease all the other played capture moves