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Doubled and supported pawns

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Do not give the doubled pawn penalty when the frontmost pawn is
supported, for instance f2-g2-g3

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 55927 W: 10418 L: 10052 D: 35457
http://tests.stockfishchess.org/tests/view/58eb9fc20ebc59035df33858

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 32078 W: 4257 L: 4035 D: 23786
http://tests.stockfishchess.org/tests/view/58ec48420ebc59035df3388b

Bench: 5995472

Closes #1062
This commit is contained in:
Stéphane Nicolet
2017-04-11 19:50:24 +02:00
committed by Joona Kiiski
parent b258b4fee7
commit 1454831220
1 changed files with 3 additions and 3 deletions
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4
src/pawns.cpp
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@@ -131,7 +131,7 @@ namespace {
stoppers = theirPawns & passed_pawn_mask(Us, s); stoppers = theirPawns & passed_pawn_mask(Us, s);
lever = theirPawns & pawnAttacksBB[s]; lever = theirPawns & pawnAttacksBB[s];
leverPush = theirPawns & pawnAttacksBB[s + Up]; leverPush = theirPawns & pawnAttacksBB[s + Up];
doubled = ourPawns & (s + Up); doubled = ourPawns & (s - Up);
neighbours = ourPawns & adjacent_files_bb(f); neighbours = ourPawns & adjacent_files_bb(f);
phalanx = neighbours & rank_bb(s); phalanx = neighbours & rank_bb(s);
supported = neighbours & rank_bb(s - Up); supported = neighbours & rank_bb(s - Up);
@@ -177,7 +177,7 @@ namespace {
if (connected) if (connected)
score += Connected[opposed][!!phalanx][more_than_one(supported)][relative_rank(Us, s)]; score += Connected[opposed][!!phalanx][more_than_one(supported)][relative_rank(Us, s)];
if (doubled) if (doubled && !supported)
score -= Doubled; score -= Doubled;
if (lever) if (lever)