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Simplify capture bonus

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Simplify capture bonus by simply adding ONE_DEPTH instead of being
dependent on BestValue.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 24419 W: 4939 L: 4824 D: 14656
http://tests.stockfishchess.org/tests/view/5b16b2040ebc5963ba37e2a5

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 44560 W: 6524 L: 6438 D: 31598
http://tests.stockfishchess.org/tests/view/5b16ccc00ebc59214346d403

Closes https://github.com/official-stockfish/Stockfish/pull/1640

Bench: 4782637
This commit is contained in:
VoyagerOne 2018-06-05 20:43:33 -04:00 • committed by Stéphane Nicolet
parent e4f8a4fa7f
commit 231103d2cf
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -1166,8 +1166,7 @@ moves_loop: // When in check, search starts from here
if (!pos.capture_or_promotion(bestMove))
update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount, stat_bonus(depth));
else
update_capture_stats(pos, bestMove, capturesSearched, captureCount,
stat_bonus(depth + (bestValue > beta + KnightValueMg ? ONE_PLY : DEPTH_ZERO)));
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
if ((ss-1)->moveCount == 1 && !pos.captured_piece())