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Tweak main killer penalty 

Apply refuted main killer penalty also on early TT cut-offs. This
makes penalty logic more consistent with the logic at normal search.

Failed STC:
http://tests.stockfishchess.org/tests/view/5c121e730ebc5902ba11aad8
LLR: -2.95 (-2.94,2.94) [0.00,5.00]
Total: 72193 W: 15848 L: 15625 D: 40720 Elo +1.07

Passed LTC:
http://tests.stockfishchess.org/tests/view/5c17b1b10ebc5902ba123c24
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 35073 W: 5886 L: 5625 D: 23562 Elo +2.59

Closes https://github.com/official-stockfish/Stockfish/pull/1878

bench: 3393939
pull/1881/head
Guenther Demetz 2018-12-18 08:05:09 +01:00 committed by Stéphane Nicolet
parent 67ae53b020
commit 0f2df4e4af
1 changed files with 5 additions and 3 deletions
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8
src/search.cpp
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@ -656,9 +656,11 @@ namespace {
if (!pos.capture_or_promotion(ttMove))
update_quiet_stats(pos, ss, ttMove, nullptr, 0, stat_bonus(depth));
// Extra penalty for a quiet TT move in previous ply when it gets refuted
if ((ss-1)->moveCount == 1 && !pos.captured_piece())
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth + ONE_PLY));
// Extra penalty for a quiet TT or main killer move in previous ply when it gets refuted
if ( (ss-1)->moveCount == 1
|| ((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));
}
// Penalty for a quiet ttMove that fails low
else if (!pos.capture_or_promotion(ttMove))