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Reduce penalty for doubled pawns further away from each other

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Passed both STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 38339 W: 6849 L: 6649 D: 24841

and LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 22693 W: 3455 L: 3256 D: 15982

bench: 7508468
This commit is contained in:
Gary Linscott 2014-04-11 11:04:48 -04:00 • committed by Marco Costalba
parent ce6b7a1b85
commit 4597324572
1 changed files with 3 additions and 3 deletions
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6
src/pawns.cpp
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@ -89,10 +89,10 @@ namespace {
const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW); const Square Right = (Us == WHITE ? DELTA_NE : DELTA_SW);
const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE); const Square Left = (Us == WHITE ? DELTA_NW : DELTA_SE);
Bitboard b, p; Bitboard b, p, doubled;
Square s; Square s;
File f; File f;
bool passed, isolated, doubled, opposed, connected, backward, candidate, unsupported; bool passed, isolated, opposed, connected, backward, candidate, unsupported;
Score value = SCORE_ZERO; Score value = SCORE_ZERO;
const Square* pl = pos.list<PAWN>(Us); const Square* pl = pos.list<PAWN>(Us);
@ -177,7 +177,7 @@ namespace {
value -= UnsupportedPawnPenalty; value -= UnsupportedPawnPenalty;
if (doubled) if (doubled)
value -= Doubled[f]; value -= Doubled[f] / rank_distance(s, lsb(doubled));
if (backward) if (backward)
value -= Backward[opposed][f]; value -= Backward[opposed][f];