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Penalize refuted killers in continuation history

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Currently we apply a penalty in continuation history for refuted TT moves.
We can use the same idea to also penalize refuted killer moves in continuation
history.

STC:
http://tests.stockfishchess.org/tests/view/5c00ccbd0ebc5902bcedd768
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 54366 W: 12086 L: 11687 D: 30593

LTC:
http://tests.stockfishchess.org/tests/view/5c0107880ebc5902bceddc9c
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 25457 W: 4302 L: 4078 D: 17077

Bench: 3419069
This commit is contained in:
Miguel Lahoz 2018-11-30 13:35:47 +08:00 • committed by Stéphane Nicolet
parent 79e3710fd2
commit 982fd9c8bc
1 changed files with 6 additions and 0 deletions
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6
src/search.cpp
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@ -1190,6 +1190,12 @@ moves_loop: // When in check, search starts from here
// 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
if ((ss-1)->moveCount == 1 && !pos.captured_piece()) if ((ss-1)->moveCount == 1 && !pos.captured_piece())
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth + ONE_PLY)); 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)