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Update search.cpp

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At PvNodes allow bonus for prior counter move that caused a fail low
for depth 1 and 2. Note : I did a speculative LTC on yellow STC patch
since history stats tend to be highly TC sensitive

STC (Yellow):
LLR: -2.96 (-2.94,2.94) [0.00,5.00]
Total: 64295 W: 13042 L: 12873 D: 38380
http://tests.stockfishchess.org/tests/view/5af507c80ebc5968e6524153

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 22407 W: 3413 L: 3211 D: 15783
http://tests.stockfishchess.org/tests/view/5af85dd40ebc591fdf408b87

Also use local variable excludedMove in NMP (marotear)

Bench:  5294316
This commit is contained in:
VoyagerOne 2018-05-14 06:52:16 +02:00 • committed by Stéphane Nicolet
parent bf01bd0755
commit aacee91a5a
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -737,7 +737,7 @@ namespace {
&& (ss-1)->statScore < 22500
&& eval >= beta
&& ss->staticEval >= beta - 36 * depth / ONE_PLY + 225
&& !ss->excludedMove
&& !excludedMove
&& pos.non_pawn_material(pos.side_to_move())
&& (ss->ply >= thisThread->nmp_ply || ss->ply % 2 != thisThread->nmp_odd))
{
@ -1153,7 +1153,7 @@ moves_loop: // When in check, search starts from here
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, -stat_bonus(depth + ONE_PLY));
}
// Bonus for prior countermove that caused the fail low
else if ( depth >= 3 * ONE_PLY
else if ( (depth >= 3 * ONE_PLY || PvNode)
&& !pos.captured_piece()
&& is_ok((ss-1)->currentMove))
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, stat_bonus(depth));