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Fix candidate passed pawn definition

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A pawn is candidate to be passed if doesn't have enemy pawns
in just front of him, not also behind !

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-04-18 10:09:12 +01:00
parent a9fa1fc7f7
commit c23cd4d90a
1 changed files with 3 additions and 2 deletions
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5
src/pawns.cpp
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@ -183,7 +183,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
Square s;
File f;
Rank r;
bool passed, isolated, doubled, chain, backward, candidate;
bool passed, isolated, doubled, opposed, chain, backward, candidate;
int bonus;
Score value = make_score(0, 0);
const Square* ptr = pos.piece_list_begin(Us, PAWN);
@ -209,6 +209,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
passed = !(theirPawns & passed_pawn_mask(Us, s));
isolated = !(ourPawns & neighboring_files_bb(s));
doubled = ourPawns & squares_behind(Us, s);
opposed = theirPawns & squares_in_front_of(Us, s);
// We calculate kingside and queenside pawn storm
// scores for both colors. These are used when evaluating
@ -299,7 +300,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
// Test for candidate passed pawn
candidate = !passed
&& !(theirPawns & file_bb(f))
&& !opposed
&& ( count_1s_max_15(neighboring_files_bb(f) & (behind_bb(Us, r) | rank_bb(r)) & ourPawns)
- count_1s_max_15(neighboring_files_bb(f) & in_front_bb(Us, r) & theirPawns)
>= 0);