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Created page with "'''Home * Engines * CPW-Engine * Attacks''' This page holds the functions responsible for detecting if a given square is attacked by a given player. =i..."
'''[[Main Page|Home]] * [[Engines]] * [[CPW-Engine]] * Attacks'''
This page holds the functions responsible for detecting if a given square is attacked by a given player.
=isAttacked=
<pre>
#include "stdafx.h"
#include "0x88_math.h"
int isAttacked( char byColor, S8 sq ) {
/* pawns */
if ( byColor == WHITE ) {
if ( IS_SQ( sq + SE ) &&
isPiece( WHITE, PAWN, sq + SE )
)
return 1;
if ( IS_SQ( sq + SW ) &&
isPiece( WHITE, PAWN, sq + SW )
)
return 1;
}
else {
if ( IS_SQ( sq + NE ) &&
isPiece( BLACK, PAWN, sq + NE )
)
return 1;
if ( IS_SQ( sq + NW ) &&
isPiece( BLACK, PAWN, sq + NW )
)
return 1;
}
/* knights */
if ( leaperAttack( byColor, sq, KNIGHT ) )
return 1;
/* kings */
if ( leaperAttack( byColor, sq, KING ) )
return 1;
/* straight line sliders */
if ( straightAttack( byColor, sq, NORTH ) ||
straightAttack( byColor, sq, SOUTH ) ||
straightAttack( byColor, sq, EAST ) ||
straightAttack( byColor, sq, WEST )
)
return 1;
/* diagonal sliders */
if ( diagAttack( byColor, sq, NE ) ||
diagAttack( byColor, sq, SE ) ||
diagAttack( byColor, sq, NW ) ||
diagAttack( byColor, sq, SW )
)
return 1;
return 0;
}
</pre>
=leaperAttack=
<pre>
int leaperAttack( char byColor, S8 sq, char byPiece ) {
S8 nextSq;
for ( int dir = 0; dir < 8; dir++ ) {
nextSq = sq + vector[byPiece][dir];
if ( IS_SQ(nextSq) &&
isPiece( byColor, byPiece, nextSq )
)
return 1;
}
return 0;
}
</pre>
=straightAttack=
<pre>
int straightAttack(char byColor, S8 sq, int vect) {
int nextSq = sq + vect;
while ( IS_SQ(nextSq) ) {
if (b.color[nextSq] != COLOR_EMPTY ) {
if ( ( b.color[nextSq] == byColor ) &&
( b.pieces[nextSq] == ROOK || b.pieces[nextSq] == QUEEN )
)
return 1;
return 0;
}
nextSq = nextSq + vect;
}
return 0;
}
</pre>
=diagAttack=
<pre>
int diagAttack(int byColor, S8 sq, int vect) {
int nextSq = sq + vect;
while ( IS_SQ( nextSq ) ) {
if (b.color[ nextSq ] != COLOR_EMPTY ) {
if ( ( b.color[nextSq] == byColor ) &&
( b.pieces[nextSq] == BISHOP || b.pieces[nextSq] == QUEEN )
)
return 1;
return 0;
}
nextSq = nextSq + vect;
}
return 0;
}
</pre>
'''[[CPW-Engine|Up one Level]]'''
This page holds the functions responsible for detecting if a given square is attacked by a given player.
=isAttacked=
<pre>
#include "stdafx.h"
#include "0x88_math.h"
int isAttacked( char byColor, S8 sq ) {
/* pawns */
if ( byColor == WHITE ) {
if ( IS_SQ( sq + SE ) &&
isPiece( WHITE, PAWN, sq + SE )
)
return 1;
if ( IS_SQ( sq + SW ) &&
isPiece( WHITE, PAWN, sq + SW )
)
return 1;
}
else {
if ( IS_SQ( sq + NE ) &&
isPiece( BLACK, PAWN, sq + NE )
)
return 1;
if ( IS_SQ( sq + NW ) &&
isPiece( BLACK, PAWN, sq + NW )
)
return 1;
}
/* knights */
if ( leaperAttack( byColor, sq, KNIGHT ) )
return 1;
/* kings */
if ( leaperAttack( byColor, sq, KING ) )
return 1;
/* straight line sliders */
if ( straightAttack( byColor, sq, NORTH ) ||
straightAttack( byColor, sq, SOUTH ) ||
straightAttack( byColor, sq, EAST ) ||
straightAttack( byColor, sq, WEST )
)
return 1;
/* diagonal sliders */
if ( diagAttack( byColor, sq, NE ) ||
diagAttack( byColor, sq, SE ) ||
diagAttack( byColor, sq, NW ) ||
diagAttack( byColor, sq, SW )
)
return 1;
return 0;
}
</pre>
=leaperAttack=
<pre>
int leaperAttack( char byColor, S8 sq, char byPiece ) {
S8 nextSq;
for ( int dir = 0; dir < 8; dir++ ) {
nextSq = sq + vector[byPiece][dir];
if ( IS_SQ(nextSq) &&
isPiece( byColor, byPiece, nextSq )
)
return 1;
}
return 0;
}
</pre>
=straightAttack=
<pre>
int straightAttack(char byColor, S8 sq, int vect) {
int nextSq = sq + vect;
while ( IS_SQ(nextSq) ) {
if (b.color[nextSq] != COLOR_EMPTY ) {
if ( ( b.color[nextSq] == byColor ) &&
( b.pieces[nextSq] == ROOK || b.pieces[nextSq] == QUEEN )
)
return 1;
return 0;
}
nextSq = nextSq + vect;
}
return 0;
}
</pre>
=diagAttack=
<pre>
int diagAttack(int byColor, S8 sq, int vect) {
int nextSq = sq + vect;
while ( IS_SQ( nextSq ) ) {
if (b.color[ nextSq ] != COLOR_EMPTY ) {
if ( ( b.color[nextSq] == byColor ) &&
( b.pieces[nextSq] == BISHOP || b.pieces[nextSq] == QUEEN )
)
return 1;
return 0;
}
nextSq = nextSq + vect;
}
return 0;
}
</pre>
'''[[CPW-Engine|Up one Level]]'''
