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Board.c
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/* Travis Wolfe
* December 2009
*/
#include "Board.h"
#include "Util.h"
#define VERBOSE 0
#define INITIAL_FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
unsigned long *rank_attacks;
unsigned long *file_attacks;
unsigned long *tl_br_attacks;
unsigned long *bl_tr_attacks;
unsigned long *king_attacks;
unsigned long *knight_attacks;
/* these are defined in Util.h */
extern int *tlbr_to_rf;
extern int *bltr_to_rf;
extern int *rf_to_tlbr;
extern int *rf_to_bltr;
extern int *rf_to_tlbr_width;
extern int *rf_to_bltr_width;
void initf(Board *board, char *fen) {
int rank, file, i;
long r_sq, f_sq, tl_br_sq, bl_tr_sq;
char c;
/* === List of Things in FEN ========
* pieces (white is in capitals)
* color to play
* castling ability
* en pessant
* halfmove clock
* fullmove number
* ================================== */
/* set the intial maps to 0 */
for(i=0; i<14; i++) {
board->rank_positions[i] = 0L;
board->file_positions[i] = 0L;
board->tl_br_positions[i] = 0L;
board->bl_tr_positions[i] = 0L;
}
/* set the pieces */
rank = 7, file = 0, i = 0;
c = 'x';
while(c != ' ') {
c = fen[i++];
/* find the rank and file sq number */
r_sq = SQUARE(rank*8 + file);
f_sq = SQUARE(file*8 + rank);
tl_br_sq = SQUARE(rf_to_tlbr[rank*8 + file]);
bl_tr_sq = SQUARE(rf_to_bltr[rank*8 + file]);
switch(c) {
case 'K':
board->rank_positions[WHITE*7 + KING] |= r_sq;
board->file_positions[WHITE*7 + KING] |= f_sq;
board->tl_br_positions[WHITE*7 + KING] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + KING] |= bl_tr_sq;
break;
case 'Q':
board->rank_positions[WHITE*7 + QUEEN] |= r_sq;
board->file_positions[WHITE*7 + QUEEN] |= f_sq;
board->tl_br_positions[WHITE*7 + QUEEN] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + QUEEN] |= bl_tr_sq;
break;
case 'R':
board->rank_positions[WHITE*7 + ROOK] |= r_sq;
board->file_positions[WHITE*7 + ROOK] |= f_sq;
board->tl_br_positions[WHITE*7 + ROOK] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + ROOK] |= bl_tr_sq;
break;
case 'B':
board->rank_positions[WHITE*7 + BISHOP] |= r_sq;
board->file_positions[WHITE*7 + BISHOP] |= f_sq;
board->tl_br_positions[WHITE*7 + BISHOP] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + BISHOP] |= bl_tr_sq;
break;
case 'N':
board->rank_positions[WHITE*7 + KNIGHT] |= r_sq;
board->file_positions[WHITE*7 + KNIGHT] |= f_sq;
board->tl_br_positions[WHITE*7 + KNIGHT] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + KNIGHT] |= bl_tr_sq;
break;
case 'P':
board->rank_positions[WHITE*7 + PAWN] |= r_sq;
board->file_positions[WHITE*7 + PAWN] |= f_sq;
board->tl_br_positions[WHITE*7 + PAWN] |= tl_br_sq;
board->bl_tr_positions[WHITE*7 + PAWN] |= bl_tr_sq;
break;
case 'k':
board->rank_positions[BLACK*7 + KING] |= r_sq;
board->file_positions[BLACK*7 + KING] |= f_sq;
board->tl_br_positions[BLACK*7 + KING] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + KING] |= bl_tr_sq;
break;
case 'q':
board->rank_positions[BLACK*7 + QUEEN] |= r_sq;
board->file_positions[BLACK*7 + QUEEN] |= f_sq;
board->tl_br_positions[BLACK*7 + QUEEN] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + QUEEN] |= bl_tr_sq;
break;
case 'r':
board->rank_positions[BLACK*7 + ROOK] |= r_sq;
board->file_positions[BLACK*7 + ROOK] |= f_sq;
board->tl_br_positions[BLACK*7 + ROOK] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + ROOK] |= bl_tr_sq;
break;
case 'b':
board->rank_positions[BLACK*7 + BISHOP] |= r_sq;
board->file_positions[BLACK*7 + BISHOP] |= f_sq;
board->tl_br_positions[BLACK*7 + BISHOP] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + BISHOP] |= bl_tr_sq;
break;
case 'n':
board->rank_positions[BLACK*7 + KNIGHT] |= r_sq;
board->file_positions[BLACK*7 + KNIGHT] |= f_sq;
board->tl_br_positions[BLACK*7 + KNIGHT] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + KNIGHT] |= bl_tr_sq;
break;
case 'p':
board->rank_positions[BLACK*7 + PAWN] |= r_sq;
board->file_positions[BLACK*7 + PAWN] |= f_sq;
board->tl_br_positions[BLACK*7 + PAWN] |= tl_br_sq;
board->bl_tr_positions[BLACK*7 + PAWN] |= bl_tr_sq;
break;
/* new rank */
case '/':
rank--;
file = -1; /* will be incremented to 0 outside swtich */
break;
/* its a number (advance by X files... he-he) */
default:
file += (c - 48);
file--; /* to counter the normal increment */
break;
}
file++;
}
/* set to color to play */
if(fen[i] == 'w' || fen[i] == 'W')
set_play(board, WHITE);
else set_play(board, BLACK);
/* set castling ability */
/* TODO */
/* set en pessant */
/* TODO */
/* set the halfmove clock */
/* TODO */
/* set fullmove number */
/* TODO */
/* set the ALL positions array */
board->rank_positions[WHITE*7 + ALL] = board->rank_positions[WHITE*7 + KING]
| board->rank_positions[WHITE*7 + QUEEN]
| board->rank_positions[WHITE*7 + ROOK]
| board->rank_positions[WHITE*7 + BISHOP]
| board->rank_positions[WHITE*7 + KNIGHT]
| board->rank_positions[WHITE*7 + PAWN];
board->rank_positions[BLACK*7 + ALL] = board->rank_positions[BLACK*7 + KING]
| board->rank_positions[BLACK*7 + QUEEN]
| board->rank_positions[BLACK*7 + ROOK]
| board->rank_positions[BLACK*7 + BISHOP]
| board->rank_positions[BLACK*7 + KNIGHT]
| board->rank_positions[BLACK*7 + PAWN];
board->file_positions[WHITE*7 + ALL] = board->file_positions[WHITE*7 + KING]
| board->file_positions[WHITE*7 + QUEEN]
| board->file_positions[WHITE*7 + ROOK]
| board->file_positions[WHITE*7 + BISHOP]
| board->file_positions[WHITE*7 + KNIGHT]
| board->file_positions[WHITE*7 + PAWN];
board->file_positions[BLACK*7 + ALL] = board->file_positions[BLACK*7 + KING]
| board->file_positions[BLACK*7 + QUEEN]
| board->file_positions[BLACK*7 + ROOK]
| board->file_positions[BLACK*7 + BISHOP]
| board->file_positions[BLACK*7 + KNIGHT]
| board->file_positions[BLACK*7 + PAWN];
board->tl_br_positions[WHITE*7 + ALL] = board->tl_br_positions[WHITE*7 + KING]
| board->tl_br_positions[WHITE*7 + QUEEN]
| board->tl_br_positions[WHITE*7 + ROOK]
| board->tl_br_positions[WHITE*7 + BISHOP]
| board->tl_br_positions[WHITE*7 + KNIGHT]
| board->tl_br_positions[WHITE*7 + PAWN];
board->tl_br_positions[BLACK*7 + ALL] = board->tl_br_positions[BLACK*7 + KING]
| board->tl_br_positions[BLACK*7 + QUEEN]
| board->tl_br_positions[BLACK*7 + ROOK]
| board->tl_br_positions[BLACK*7 + BISHOP]
| board->tl_br_positions[BLACK*7 + KNIGHT]
| board->tl_br_positions[BLACK*7 + PAWN];
board->bl_tr_positions[WHITE*7 + ALL] = board->bl_tr_positions[WHITE*7 + KING]
| board->bl_tr_positions[WHITE*7 + QUEEN]
| board->bl_tr_positions[WHITE*7 + ROOK]
| board->bl_tr_positions[WHITE*7 + BISHOP]
| board->bl_tr_positions[WHITE*7 + KNIGHT]
| board->bl_tr_positions[WHITE*7 + PAWN];
board->bl_tr_positions[BLACK*7 + ALL] = board->bl_tr_positions[BLACK*7 + KING]
| board->bl_tr_positions[BLACK*7 + QUEEN]
| board->bl_tr_positions[BLACK*7 + ROOK]
| board->bl_tr_positions[BLACK*7 + BISHOP]
| board->bl_tr_positions[BLACK*7 + KNIGHT]
| board->bl_tr_positions[BLACK*7 + PAWN];
}
void printb(Board *board) {
long sq;
int rank, file;
char b[8][8];
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
sq = SQUARE(rank*8+file);
if(board->rank_positions[WHITE*7+QUEEN] & sq)
b[rank][file] = 'Q';
else if(board->rank_positions[WHITE*7+KING] & sq)
b[rank][file] = 'K';
else if(board->rank_positions[WHITE*7+ROOK] & sq)
b[rank][file] = 'R';
else if(board->rank_positions[WHITE*7+BISHOP] & sq)
b[rank][file] = 'B';
else if(board->rank_positions[WHITE*7+KNIGHT] & sq)
b[rank][file] = 'N';
else if(board->rank_positions[WHITE*7+PAWN] & sq)
b[rank][file] = 'P';
else if(board->rank_positions[BLACK*7+QUEEN] & sq)
b[rank][file] = 'q';
else if(board->rank_positions[BLACK*7+KING] & sq)
b[rank][file] = 'k';
else if(board->rank_positions[BLACK*7+ROOK] & sq)
b[rank][file] = 'r';
else if(board->rank_positions[BLACK*7+BISHOP] & sq)
b[rank][file] = 'b';
else if(board->rank_positions[BLACK*7+KNIGHT] & sq)
b[rank][file] = 'n';
else if(board->rank_positions[BLACK*7+PAWN] & sq)
b[rank][file] = 'p';
else b[rank][file] = '-';
}
}
printf(" A B C D E F G H\n");
printf(" ------------------------\n");
for(rank=7; rank>=0; rank--) {
printf("%d |", rank+1);
for(file=0; file<8; file++) {
printf(" %c ", b[rank][file]);
}
printf("| %d\n", rank+1);
}
printf(" ------------------------\n");
printf(" A B C D E F G H\n");
}
void setup(Board *board) {
if(VERBOSE)
printf("[Board.init]\tinitializing the board\n");
set_play(board, WHITE);
set_ply(board, 0);
initf(board, INITIAL_FEN);
}
int ply(Board *board) {
return (board->ply_and_play & 0xFFFF);
}
void set_ply(Board *board, int ply) {
board->ply_and_play &= ~0xFFFF;
board->ply_and_play |= ply;
}
int to_play(Board *board) {
int offset = sizeof(int) - 1;
if((board->ply_and_play >> offset) ^ WHITE)
return BLACK;
return WHITE;
}
void set_play(Board *board, int color) {
int offset = sizeof(int) - 1;
board->ply_and_play = color << offset;
}
unsigned long* make_file_attacks(void) {
/* note: the size of this lookup table can
* be cut by 75% by removing the 2 bits that
* signify the ends of the board. you can always
* move to them whether there is a piece there
* or not.
*/
int rank, file, i, j, k;
unsigned long* r = (unsigned long*) malloc(64*256*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
/* either this or make_rank_attacks needs
* to index differently
*/
k = rank*8 + file;
for(i=0; i<256; i++) {
r[k*256 + i] = 0L;
j = rank-1;
while(j >= 0 && ( (i & (1<<j)) == 0 )) {
r[k*256 + i] |= SQUARE(j*8 + file);
j--;
}
if(j >= 0)
r[k*256 + i] |= SQUARE(j*8 + file);
j = rank+1;
while(j < 8 && ( (i & (1<<j)) == 0 )) {
r[k*256 + i] |= SQUARE(j*8 + file);
j++;
}
if(j < 8)
r[k*256 + i] |= SQUARE(j*8 + file);
}
}
}
return r;
}
unsigned long* make_rank_attacks(void) {
/* note: the size of this lookup table can
* be cut by 75% by removing the 2 bits that
* signify the ends of the board. you can always
* move to them whether there is a piece there
* or not.
*/
int rank, file, i, j, k;
unsigned long* r = (unsigned long*) malloc(64*256*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
/* either this or make_file_attacks needs
* to index differently
*/
k = rank*8 + file;
for(i=0; i<256; i++) {
r[k*256 + i] = 0L;
j = file-1;
while(j >= 0 && ( (i & (1<<j)) == 0 )) {
r[k*256 + i] |= SQUARE(rank*8 + j);
j--;
}
if(j >= 0)
r[k*256 + i] |= SQUARE(rank*8 + j);
j = file+1;
while(j < 8 && ( (i & (1<<j)) == 0 )) {
r[k*256 + i] |= SQUARE(rank*8 + j);
j++;
}
if(j < 8)
r[k*256 + i] |= SQUARE(rank*8 + j);
}
}
}
return r;
}
unsigned long* make_tl_br_attacks(void) {
int rank, file, width, i, j, sq, tlbr;
unsigned long *r = (unsigned long*) malloc(64*256*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
/* for this rank, file the length of
* the diagnol is:
*/
if(rank >= file) {
width = (7-rank) + file + 1;
tlbr = width*(width-1)/2;
}
else {
width = rank + (7-file) + 1;
tlbr = 64 - (width*(width-1)/2 + width);
}
/* how you index is pretty much arbitrary
* since i have allocated a full 256 possiblities
* for each square. it would matter if i only used
* the space needed, but that is slightly more
* comlicated (maybe something for later versions)
*
* so for convenience, i am going to use standard
* square indexing
*/
sq = rank*8 + file;
/* make a set of bit masks for the
* 2^width configurations
*/
for(i = (1<<width) - 1; i>=0; i--) {
/* this addressing system will work,
* but wont be space efficient
*/
r[sq*256 + i] = 0L;
/* in configuration i, sq is at place file */
j = (rf_to_tlbr[sq]-tlbr) - 1;
while(j >= 0 && ( (i & (1<<j)) == 0) ) {
r[sq*256 + i] |= SQUARE(tlbr + j);
j--;
}
if(j >= 0) {
r[sq*256 + i] |= SQUARE(tlbr + j);
}
j = (rf_to_tlbr[sq]-tlbr) + 1;
while(j < width && ( (i & (1<<j)) == 0) ) {
r[sq*256 + i] |= SQUARE(tlbr + j);
j++;
}
if(j < width) {
r[sq*256 + i] |= SQUARE(tlbr + j);
}
}
}
}
return r;
}
unsigned long* make_bl_tr_attacks(void) {
int rank, file, width, i, j, sq, bltr;
unsigned long *r = (unsigned long*) malloc(64*256*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
width = rf_to_bltr_width[rank*8 + file];
bltr = rf_to_bltr_start[rank*8 + file];
/* how you index is pretty much arbitrary
* since i have allocated a full 256 possiblities
* for each square. it would matter if i only used
* the space needed, but that is slightly more
* comlicated (maybe something for later versions)
*
* so for convenience, i am going to use standard
* square indexing
*/
sq = rank*8 + file;
/* make a set of bit masks for the
* 2^width configurations
*/
for(i = (1<<width) - 1; i>=0; i--) {
/* this addressing system will work,
* but wont be space efficient
*/
r[sq*256 + i] = 0L;
/* in configuration i, sq is at place file */
j = (rf_to_bltr[sq]-bltr) - 1;
while(j >= 0 && ( (i & (1<<j)) == 0) ) {
r[sq*256 + i] |= SQUARE(bltr + j);
j--;
}
if(j >= 0) {
r[sq*256 + i] |= SQUARE(bltr + j);
}
j = (rf_to_bltr[sq]-bltr) + 1;
while(j < width && ( (i & (1<<j)) == 0) ) {
r[sq*256 + i] |= SQUARE(bltr + j);
j++;
}
if(j < width) {
r[sq*256 + i] |= SQUARE(bltr + j);
}
}
}
}
return r;
}
unsigned long* make_knight_attacks(void) {
int rank, file, sq;
unsigned long *r = (unsigned long*) malloc(64*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
sq = rank*8 + file;
r[sq] = 0L;
/* up, right */
if(rank < 6 && file < 7) {
r[sq] |= SQUARE(sq + 2*UP + RIGHT);
}
/* up, left */
if(rank < 6 && file > 0) {
r[sq] |= SQUARE(sq + 2*UP + LEFT);
}
/* right, up */
if(rank < 7 && file < 6) {
r[sq] |= SQUARE(sq + 2*RIGHT + UP);
}
/* right, down */
if(rank > 0 && file < 6) {
r[sq] |= SQUARE(sq + 2*RIGHT + DOWN);
}
/* down, right */
if(rank > 1 && file < 7) {
r[sq] |= SQUARE(sq + 2*DOWN + RIGHT);
}
/* down, left */
if(rank > 1 && file > 0) {
r[sq] |= SQUARE(sq + 2*DOWN + LEFT);
}
/* left, down */
if(rank > 0 && file > 1) {
r[sq] |= SQUARE(sq + 2*LEFT + DOWN);
}
/* left, up */
if(rank < 7 && file > 1) {
r[sq] |= SQUARE(sq + 2*LEFT + UP);
}
}
}
return r;
}
unsigned long* make_king_attacks(void) {
int rank, file, sq;
unsigned long *r = (unsigned long*) malloc(64*sizeof(unsigned long));
for(rank=0; rank<8; rank++) {
for(file=0; file<8; file++) {
sq = rank*8 + file;
r[sq] = 0L;
/* up, right */
if(rank < 7 && file < 7) {
r[sq] |= SQUARE(sq + UP + RIGHT);
}
/* up, left */
if(rank < 7 && file > 0) {
r[sq] |= SQUARE(sq + UP + LEFT);
}
/* right, up */
if(rank < 7 && file < 7) {
r[sq] |= SQUARE(sq + RIGHT + UP);
}
/* right, down */
if(rank > 0 && file < 7) {
r[sq] |= SQUARE(sq + RIGHT + DOWN);
}
/* down, right */
if(rank > 0 && file < 7) {
r[sq] |= SQUARE(sq + DOWN + RIGHT);
}
/* down, left */
if(rank > 0 && file > 0) {
r[sq] |= SQUARE(sq + DOWN + LEFT);
}
/* left, down */
if(rank > 0 && file > 0) {
r[sq] |= SQUARE(sq + LEFT + DOWN);
}
/* left, up */
if(rank < 7 && file > 0) {
r[sq] |= SQUARE(sq + LEFT + UP);
}
}
}
return r;
}
Move* gen_moves(Board *board, int *number) {
Move *moves;
unsigned long mask;
int from, to, me, you, capt, flip, temp, width;
unsigned char push, file, rank, diag;
moves = (Move*) malloc(MAX_MOVES*sizeof(Move));
*number = 0;
capt = NA;
me = to_play(board);
you = 1 - me;
if(me == WHITE) flip = 1;
else flip = -1;
/* go through each piece and generate moves for it */
from = MSB(board->rank_positions[me*7 + ALL], 0);
while(from >= 0) {
/* KNIGHT MOVES */
if(board->rank_positions[me*7 + KNIGHT] & SQUARE(from)) {
mask = knight_attacks[from] & ~(board->rank_positions[me*7 + ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
}
else capt = NA;
move_set(&moves[(*number)++], from, to, KNIGHT, capt);
to = MSB(mask, 64-to);
}
}
/* BISHOP MOVES */
else if(board->rank_positions[me*7 + BISHOP] & SQUARE(from)) {
/* tl_br moves */
mask = board->tl_br_positions[me*7 + ALL] | board->tl_br_positions[you*7 + ALL];
width = rf_to_tlbr_width[from];
diag = (unsigned char) (mask >> rf_to_tlbr_start[from]) & ((1<<width) - 1);
mask = tl_br_attacks[from*256 + diag] & ~(board->tl_br_positions[me*7+ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->tl_br_positions[you*7 + ALL] & SQUARE(to)) {
if(board->tl_br_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->tl_br_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->tl_br_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->tl_br_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->tl_br_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->tl_br_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves1]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
/* need to convert to: tl_br => rank*8+file */
/* note: from is already in rank*8+file */
temp = tlbr_to_rf[to];
move_set(&moves[(*number)++], from, temp, BISHOP, capt);
to = MSB(mask, 64-to);
}
/* bl_tr moves */
mask = board->bl_tr_positions[me*7 + ALL] | board->bl_tr_positions[you*7 + ALL];
width = rf_to_bltr_width[from];
diag = (unsigned char) (mask >> rf_to_bltr_start[from]) & ((1<<width) - 1);
mask = bl_tr_attacks[from*256 + diag] & ~(board->bl_tr_positions[me*7+ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->bl_tr_positions[you*7 + ALL] & SQUARE(to)) {
if(board->bl_tr_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->bl_tr_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->bl_tr_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->bl_tr_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->bl_tr_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->bl_tr_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves2]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
/* need to convert to: tl_br => rank*8+file */
/* note: from is already in rank*8+file */
temp = bltr_to_rf[to];
move_set(&moves[(*number)++], from, temp, BISHOP, capt);
to = MSB(mask, 64-to);
}
}
/* QUEEN MOVES */
else if(board->rank_positions[me*7 + QUEEN] & SQUARE(from)) {
/* tl_br moves */
mask = board->tl_br_positions[me*7 + ALL] | board->tl_br_positions[you*7 + ALL];
width = rf_to_tlbr_width[from];
diag = (unsigned char) (mask >> rf_to_tlbr_start[from]) & ((1<<width) - 1);
mask = tl_br_attacks[from*256 + diag] & ~(board->tl_br_positions[me*7+ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->tl_br_positions[you*7 + ALL] & SQUARE(to)) {
if(board->tl_br_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->tl_br_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->tl_br_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->tl_br_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->tl_br_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->tl_br_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves3]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
/* need to convert to: tl_br => rank*8+file */
/* note: from is already in rank*8+file */
temp = tlbr_to_rf[to];
move_set(&moves[(*number)++], from, temp, QUEEN, capt);
to = MSB(mask, 64-to);
}
/* bl_tr moves */
mask = board->bl_tr_positions[me*7 + ALL] | board->bl_tr_positions[you*7 + ALL];
width = rf_to_bltr_width[from];
diag = (unsigned char) (mask >> rf_to_bltr_start[from]) & ((1<<width) - 1);
mask = bl_tr_attacks[from*256 + diag] & ~(board->bl_tr_positions[me*7+ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->bl_tr_positions[you*7 + ALL] & SQUARE(to)) {
if(board->bl_tr_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->bl_tr_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->bl_tr_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->bl_tr_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->bl_tr_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->bl_tr_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves4]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
/* need to convert to: tl_br => rank*8+file */
/* note: from is already in rank*8+file */
temp = bltr_to_rf[to];
move_set(&moves[(*number)++], from, temp, QUEEN, capt);
to = MSB(mask, 64-to);
}
/* rank moves */
mask = board->rank_positions[me*7 + ALL] | board->rank_positions[you*7 + ALL];
rank = (unsigned char) (mask >> (RANK(from)*8));
mask = rank_attacks[from*256 + rank] & ~(board->rank_positions[me*7 + ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves5]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
move_set(&moves[(*number)++], from, to, QUEEN, capt);
to = MSB(mask, 64-to);
}
/* file moves */
mask = board->file_positions[me*7 + ALL] | board->file_positions[you*7 + ALL];
file = (unsigned char) (mask >> (FILE(from)*8));
mask = file_attacks[from*256 + file] & ~(board->rank_positions[me*7 + ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves6]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
move_set(&moves[(*number)++], from, to, QUEEN, capt);
to = MSB(mask, 64-to);
}
}
/* PAWN MOVES */
else if(board->rank_positions[me*7 + PAWN] & SQUARE(from)) {
/* check captures */
if((me == WHITE && RANK(from) < 7) || (me == BLACK && RANK(from) > 0)) {
/* forward, left */
to = from + UP*flip + LEFT;
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
move_set(&moves[(*number)++], from, to, PAWN, capt);
}
/* forward, right */
to = from + UP*flip + RIGHT;
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
move_set(&moves[(*number)++], from, to, PAWN, capt);
}
}
/* check single push */
push = 0;
to = from + UP*flip;
if(to < 64 && to >= 0 &&
!(board->rank_positions[you*7 + ALL] & SQUARE(to)) &&
!(board->rank_positions[me*7 + ALL] & SQUARE(to))) {
if((me == WHITE && RANK(from) == 1) || (me == BLACK && RANK(from) == 6))
push = 1;
move_set(&moves[(*number)++], from, to, PAWN, NA);
}
/* check double push */
to = from + 2*UP*flip;
if(push > 0 && to < 64 && to >= 0 &&
!(board->rank_positions[you*7 + ALL] & SQUARE(to)) &&
!(board->rank_positions[me*7 + ALL] & SQUARE(to))) {
move_set(&moves[(*number)++], from, to, PAWN, NA);
}
}
/* ROOK MOVES */
else if(board->rank_positions[me*7 + ROOK] & SQUARE(from)) {
/* get the rank moves */
mask = board->rank_positions[me*7 + ALL] | board->rank_positions[you*7 + ALL];
rank = (unsigned char) (mask >> (RANK(from)*8));
mask = rank_attacks[from*256 + rank] & ~(board->rank_positions[me*7 + ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves7]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
move_set(&moves[(*number)++], from, to, ROOK, capt);
to = MSB(mask, 64-to);
}
/* get the file moves */
mask = board->file_positions[me*7 + ALL] | board->file_positions[you*7 + ALL];
file = (unsigned char) (mask >> (FILE(from)*8));
mask = file_attacks[from*256 + file] & ~(board->rank_positions[me*7 + ALL]);
to = MSB(mask, 0);
while(to >= 0) {
if(board->rank_positions[you*7 + ALL] & SQUARE(to)) {
if(board->rank_positions[you*7 + QUEEN] & SQUARE(to))
capt = QUEEN;
else if(board->rank_positions[you*7 + KING] & SQUARE(to))
capt = KING;
else if(board->rank_positions[you*7 + ROOK] & SQUARE(to))
capt = ROOK;
else if(board->rank_positions[you*7 + BISHOP] & SQUARE(to))
capt = BISHOP;
else if(board->rank_positions[you*7 + KNIGHT] & SQUARE(to))
capt = KNIGHT;
else if(board->rank_positions[you*7 + PAWN] & SQUARE(to))
capt = PAWN;
else printf("\n[gen_moves8]\nFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\tFAIL!\n\n");
}
else capt = NA;
move_set(&moves[(*number)++], from, to, ROOK, capt);
to = MSB(mask, 64-to);
}
}