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Fix two bugs in ok_to_prune() (2)

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-12 22:27:43 +01:00
parent 07b45151d2
commit 8ee3124487
1 changed files with 17 additions and 14 deletions
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31
src/search.cpp
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@ -2158,31 +2158,34 @@ namespace {
tto = move_to(threat); tto = move_to(threat);
// Case 1: Castling moves are never pruned. // Case 1: Castling moves are never pruned.
if(move_is_castle(m)) if (move_is_castle(m))
return false; return false;
// Case 2: Don't prune moves which move the threatened piece // Case 2: Don't prune moves which move the threatened piece
if(!PruneEscapeMoves && threat != MOVE_NONE && mfrom == tto) if (!PruneEscapeMoves && threat != MOVE_NONE && mfrom == tto)
return false; return false;
// Case 3: If the threatened piece has value less than or equal to the // Case 3: If the threatened piece has value less than or equal to the
// value of the threatening piece, don't prune move which defend it. // value of the threatening piece, don't prune move which defend it.
if(!PruneDefendingMoves && threat != MOVE_NONE if ( !PruneDefendingMoves
&& (piece_value_midgame(pos.piece_on(tfrom)) && threat != MOVE_NONE
>= piece_value_midgame(pos.piece_on(tto))) && pos.type_of_piece_on(tto) != NO_PIECE_TYPE
&& pos.move_attacks_square(m, tto)) && ( pos.midgame_value_of_piece_on(tfrom) >= pos.midgame_value_of_piece_on(tto)
|| pos.type_of_piece_on(tfrom) == KING)
&& pos.move_attacks_square(m, tto))
return false; return false;
// Case 4: Don't prune moves with good history. // Case 4: Don't prune moves with good history.
if(!H.ok_to_prune(pos.piece_on(move_from(m)), m, d)) if (!H.ok_to_prune(pos.piece_on(move_from(m)), m, d))
return false; return false;
// Case 5: If the moving piece in the threatened move is a slider, don't // Case 5: If the moving piece in the threatened move is a slider, don't
// prune safe moves which block its ray. // prune safe moves which block its ray.
if(!PruneBlockingMoves && threat != MOVE_NONE if ( !PruneBlockingMoves
&& piece_is_slider(pos.piece_on(tfrom)) && threat != MOVE_NONE
&& bit_is_set(squares_between(tfrom, tto), mto) && pos.see(m) >= 0) && piece_is_slider(pos.piece_on(tfrom))
return false; && bit_is_set(squares_between(tfrom, tto), mto) && pos.see(m) >= 0)
return false;
return true; return true;
} }