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Simplify doubled pawn

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Only use doubled pawn malus when the doubled pawns are on consecutive squares.

Passed STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7678 W: 1469 L: 1325 D: 4884

And LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 26739 W: 3562 L: 3449 D: 19728

Bench: 8211685
This commit is contained in:
Stéphane Nicolet
2016-05-24 08:09:13 +02:00
committed by Marco Costalba
parent 71bfbb22fc
commit ab0f4c0353
1 changed files with 3 additions and 3 deletions
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6
src/pawns.cpp
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@@ -124,7 +124,7 @@ namespace {
opposed = theirPawns & forward_bb(Us, s);
stoppers = theirPawns & passed_pawn_mask(Us, s);
lever = theirPawns & pawnAttacksBB[s];
doubled = ourPawns & forward_bb(Us, s);
doubled = ourPawns & (s + Up);
neighbours = ourPawns & adjacent_files_bb(f);
phalanx = neighbours & rank_bb(s);
supported = neighbours & rank_bb(s - Up);
@@ -150,7 +150,7 @@ namespace {
// Passed pawns will be properly scored in evaluation because we need
// full attack info to evaluate them. Only the frontmost passed
// pawn on each file is considered a true passed pawn.
if (!(stoppers | doubled))
if (!(stoppers | doubled)) // FIXME this is just doubled by adjacent pawn
e->passedPawns[Us] |= s;
// Score this pawn
@@ -167,7 +167,7 @@ namespace {
score += Connected[opposed][!!phalanx][more_than_one(supported)][relative_rank(Us, s)];
if (doubled)
score -= Doubled / distance<Rank>(s, frontmost_sq(Us, doubled));
score -= Doubled;
if (lever)
score += Lever[relative_rank(Us, s)];