opelly/Stockfish
1
0
Fork 0
mirror of https://github.com/opelly27/Stockfish.git synced 2026-05-20 15:37:47 +00:00
Code Issues Packages Projects Releases Wiki Activity

Bitwise operator overloads between Bitboard and Square

Browse Source 
Yes, we try to be fancy here ;-)

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-01-29 09:54:17 +01:00
parent 875a8079bc
commit a492a9dd07
9 changed files with 98 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+9 -12
View File
@@ -1363,8 +1363,7 @@ split_point_start: // At split points actual search starts from here
return true;
// Rule 2. Queen contact check is very dangerous
if ( type_of(pc) == QUEEN
&& bit_is_set(kingAtt, to))
if (type_of(pc) == QUEEN && (kingAtt & to))
return true;
// Rule 3. Creating new double threats with checks
@@ -1419,23 +1418,21 @@ split_point_start: // At split points actual search starts from here
// Case 3: Moving through the vacated square
p2 = pos.piece_on(f2);
if ( piece_is_slider(p2)
&& bit_is_set(squares_between(f2, t2), f1))
if (piece_is_slider(p2) && (squares_between(f2, t2) & f1))
return true;
// Case 4: The destination square for m2 is defended by the moving piece in m1
p1 = pos.piece_on(t1);
if (bit_is_set(pos.attacks_from(p1, t1), t2))
if (pos.attacks_from(p1, t1) & t2)
return true;
// Case 5: Discovered check, checking piece is the piece moved in m1
ksq = pos.king_square(pos.side_to_move());
if ( piece_is_slider(p1)
&& bit_is_set(squares_between(t1, ksq), f2))
if (piece_is_slider(p1) && (squares_between(t1, ksq) & f2))
{
Bitboard occ = pos.occupied_squares();
xor_bit(&occ, f2);
if (bit_is_set(pos.attacks_from(p1, t1, occ), ksq))
occ ^= f2;
if (pos.attacks_from(p1, t1, occ) & ksq)
return true;
}
return false;
@@ -1505,9 +1502,9 @@ split_point_start: // At split points actual search starts from here
// Case 3: If the moving piece in the threatened move is a slider, don't
// prune safe moves which block its ray.
if ( piece_is_slider(pos.piece_on(tfrom))
&& bit_is_set(squares_between(tfrom, tto), mto)
&& pos.see_sign(m) >= 0)
if ( piece_is_slider(pos.piece_on(tfrom))
&& (squares_between(tfrom, tto) & mto)
&& pos.see_sign(m) >= 0)
return true;
return false;