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Two small fixes in passed pawns evaluation

Browse source 
The one in evaluate_passed_pawns() is just a micro
optimization, the other in evaluate_unstoppable_pawns()
is indeed a fix, although almost unmeasurable in real
games.

Bugs report and fixes by Marek Kwiatkowski

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-07-26 06:07:34 +01:00
parent 5ee7dfebf7
commit 935fc09fd4
1 changed files with 2 additions and 2 deletions
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4
src/evaluate.cpp
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@ -821,7 +821,7 @@ namespace {
// add all X-ray attacks by the rook or queen. Otherwise consider only // add all X-ray attacks by the rook or queen. Otherwise consider only
// the squares in the pawn's path attacked or occupied by the enemy. // the squares in the pawn's path attacked or occupied by the enemy.
if ( (squares_behind(Us, s) & pos.pieces(ROOK, QUEEN, Them)) if ( (squares_behind(Us, s) & pos.pieces(ROOK, QUEEN, Them))
&& (squares_behind(Us, s) & pos.pieces(ROOK, QUEEN, Them) & pos.attacks_from<QUEEN>(s))) && (squares_behind(Us, s) & pos.pieces(ROOK, QUEEN, Them) & pos.attacks_from<ROOK>(s)))
unsafeSquares = squaresToQueen; unsafeSquares = squaresToQueen;
else else
unsafeSquares = squaresToQueen & (ei.attacked_by(Them) | pos.pieces_of_color(Them)); unsafeSquares = squaresToQueen & (ei.attacked_by(Them) | pos.pieces_of_color(Them));
@ -902,7 +902,7 @@ namespace {
if (d < 0 || pathDefended) if (d < 0 || pathDefended)
{ {
int mtg = RANK_8 - relative_rank(c, s); int mtg = RANK_8 - relative_rank(c, s) - int(relative_rank(c, s) == RANK_2);
int blockerCount = count_1s_max_15(squares_in_front_of(c, s) & pos.occupied_squares()); int blockerCount = count_1s_max_15(squares_in_front_of(c, s) & pos.occupied_squares());
mtg += blockerCount; mtg += blockerCount;
d += blockerCount; d += blockerCount;