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Simplify Killer Move Penalty

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STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20816 W: 4525 L: 4402 D: 11889
http://tests.stockfishchess.org/tests/view/5c017cb90ebc5902bcede5b4

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 39287 W: 6401 L: 6309 D: 26577
http://tests.stockfishchess.org/tests/view/5c01825e0ebc5902bcede686

Bench: 3773021
This commit is contained in:
VoyagerOne 2018-12-06 14:39:41 +01:00 • committed by Stéphane Nicolet
parent b19ad4977c
commit 7b4f9c37cb
1 changed files with 5 additions and 8 deletions
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13
src/search.cpp
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@ -1185,15 +1185,12 @@ moves_loop: // When in check, search starts from here
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 or main killer move in previous ply when it gets refuted
if ((ss-1)->moveCount == 1 && !pos.captured_piece()) if ( (ss-1)->moveCount == 1
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth + ONE_PLY)); || ((ss-1)->currentMove == (ss-1)->killers[0] && (ss-1)->killers[0]))
if (!pos.captured_piece())
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth + ONE_PLY));
// Extra penalty for killer move in previous ply when it gets refuted
else if ( (ss-1)->killers[0]
&& (ss-1)->currentMove == (ss-1)->killers[0]
&& !pos.captured_piece())
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth));
} }
// Bonus for prior countermove that caused the fail low // Bonus for prior countermove that caused the fail low
else if ( (depth >= 3 * ONE_PLY || PvNode) else if ( (depth >= 3 * ONE_PLY || PvNode)