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utils.c
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/*
Sjeng - a chess variants playing program
Copyright (C) 2000-2001 Gian-Carlo Pascutto
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
File: utils.c
Purpose: misc. functions used throughout the program
*/
#include "config.h"
#include "sjeng.h"
#include "extvars.h"
#include "protos.h"
#include "limits.h"
#ifdef HAVE_SELECT
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
fd_set read_fds;
struct timeval timeout = { 0, 0 };
#else
#ifdef _WIN32
#undef frame
#include <windows.h>
#include <time.h>
#define frame 0
#endif
#endif
/* Random number generator stuff */
#define N (624)
#define M (397)
#define K (0x9908B0DFU)
#define hiBit(u) ((u) & 0x80000000U)
#define loBit(u) ((u) & 0x00000001U)
#define loBits(u) ((u) & 0x7FFFFFFFU)
#define mixBits(u, v) (hiBit(u)|loBits(v))
static unsigned long state[N+1];
static unsigned long *next;
int left = -1;
long int allocate_time (void) {
/* calculate the ammount of time the program can use in its search, measured
in centi-seconds (calculate everything in float for more accuracy as
we go, and return the result as a long int) */
float allocated_time = 0.0, move_speed = 20.0;
/* sudden death time allocation: */
if (!moves_to_tc) {
/* calculate move speed. The idea is that if we are behind, we move
faster, and if we have < 1 min left and a small increment, we REALLY
need to start moving fast. Also, if we aren't in a super fast
game, don't worry about being behind on the clock at the beginning,
because some players will make instant moves in the opening, and Sjeng
will play poorly if it tries to do the same. */
/* check to see if we're behind on time and need to speed up: */
if ((min_per_game < 6 && !inc)
|| time_left < (((min_per_game*6000) + (sec_per_game*100))*4.0/5.0))
{
if ((opp_time-time_left) > (opp_time/5.0) && xb_mode)
move_speed = 40.0;
else if ((opp_time-time_left) > (opp_time/10.0) && xb_mode)
move_speed = 30.0;
else if ((opp_time-time_left) > (opp_time/20.0) && xb_mode)
move_speed = 25.0;
}
if ((Variant != Suicide) && (Variant != Losers))
{
if ((time_left-opp_time) > (time_left/5.0) && xb_mode)
move_speed -= 10;
else if ((time_left-opp_time) > (time_left/10.0) && xb_mode)
move_speed -= 5;
}
else if (Variant == Suicide)
{
move_speed -= 10;
}
else if (Variant == Losers)
{
move_speed -= 5;
}
/* allocate our base time: */
allocated_time = time_left/move_speed;
/* add our increment if applicable: */
if (inc) {
if (time_left-allocated_time-inc > 500) {
allocated_time += inc;
}
else if (time_left-allocated_time-(inc*2.0/3.0) > 100) {
allocated_time += inc*2.0/3.0;
}
}
}
/* conventional clock time allocation: */
else {
allocated_time = (((float)min_per_game * 6000.
+ (float)sec_per_game * 100.)/(float)moves_to_tc) - 100.;
/* if we've got extra time, use some of it: */
if (time_cushion) {
allocated_time += time_cushion*2.1/3.0;
time_cushion -= time_cushion*2.1/3.0;
}
}
if (Variant == Bughouse)
{
allocated_time *= 1./4.;
if ((opp_time > time_left) || (opp_time < 1500))
{
/* behind on time or blitzing out */
allocated_time *= 1./2.;
}
}
return ((long int) allocated_time);
}
void comp_to_san (move_s move, char str[])
{
move_s moves[MOVE_BUFF];
move_s evade_moves[MOVE_BUFF];
char type_to_char[] = { 'F', 'P', 'P', 'N', 'N', 'K', 'K', 'R', 'R', 'Q', 'Q', 'B', 'B', 'E' };
int i, num_moves, evasions, ambig, mate;
int f_rank, t_rank, converter;
char f_file, t_file;
int ic;
//eps = ep_square;
f_rank = rank (move.from);
t_rank = rank (move.target);
converter = (int) 'a';
f_file = file (move.from)+converter-1;
t_file = file (move.target)+converter-1;
if (move.from == 0)
{
sprintf (str, "%c@%c%d", type_to_char[move.promoted], t_file, t_rank);
}
else if ((board[move.from] == wpawn) || (board[move.from] == bpawn))
{
if (board[move.target] == npiece && !move.ep)
{
if(!move.promoted)
{
sprintf (str, "%c%d", t_file, t_rank);
}
else
{
sprintf (str, "%c%d=%c", t_file, t_rank, type_to_char[move.promoted]);
}
}
else
{
if (!move.promoted)
{
sprintf (str, "%cx%c%d", f_file, t_file, t_rank);
}
else
{
sprintf (str, "%cx%c%d=%c", f_file, t_file, t_rank,
type_to_char[move.promoted]);
}
}
}
else if (move.castled != no_castle)
{
if (move.castled == wck || move.castled == bck)
{
sprintf (str, "O-O");
}
else
{
sprintf(str, "O-O-O");
}
}
else
{
ambig = -1;
num_moves = 0;
gen(&moves[0]);
num_moves = numb_moves;
ic = in_check();
/* check whether there is another, identical piece that
could also move to this square */
for(i = 0; i < num_moves; i++)
{
if ((moves[i].target == move.target) &&
(board[moves[i].from] == board[move.from]) &&
(moves[i].from != move.from))
{
/* would it be a legal move ? */
make(&moves[0], i);
if (check_legal(&moves[0], i, ic))
{
unmake(&moves[0], i);
ambig = i;
break;
}
unmake(&moves[0], i);
}
}
if (ambig != -1)
{
if (board[move.target] == npiece)
{
if (file(moves[ambig].from) != file(move.from))
sprintf(str, "%c%c%c%d", type_to_char[board[move.from]],
f_file, t_file, t_rank);
else
sprintf(str, "%c%d%c%d", type_to_char[board[move.from]],
f_rank, t_file, t_rank);
}
else
{
if (file(moves[ambig].from) != file(move.from))
sprintf(str, "%c%cx%c%d", type_to_char[board[move.from]],
f_file, t_file, t_rank);
else
sprintf(str, "%c%dx%c%d", type_to_char[board[move.from]],
f_rank, t_file, t_rank);
}
}
else
{
if (board[move.target] == npiece)
{
sprintf(str, "%c%c%d", type_to_char[board[move.from]],
t_file, t_rank);
}
else
{
sprintf(str, "%cx%c%d", type_to_char[board[move.from]],
t_file, t_rank);
}
}
}
//ep_square = eps;
make(&move, 0);
if (!check_legal(&move, 0, 1))
{
strcpy(str, "illg");
unmake(&move, 0);
return;
}
if (in_check())
{
mate = TRUE;
evasions = 0;
gen(&evade_moves[0]);
evasions = numb_moves;
for (i = 0; i < evasions; i++)
{
make(&evade_moves[0], i);
if (check_legal(&evade_moves[0], i, TRUE))
{
mate = FALSE;
unmake(&evade_moves[0], i);
break;
}
unmake(&evade_moves[0], i);
}
if (mate == TRUE)
strcat(str, "#");
else
strcat(str, "+");
}
unmake(&move, 0);
}
void comp_to_coord (move_s move, char str[]) {
/* convert a move_s internal format move to coordinate notation: */
int prom, from, target, f_rank, t_rank, converter;
char f_file, t_file;
char type_to_char[] = { 'F', 'P', 'P', 'N', 'N', 'K', 'K', 'R', 'R', 'Q', 'Q', 'B', 'B', 'E' };
prom = move.promoted;
from = move.from;
target = move.target;
f_rank = rank (from);
t_rank = rank (target);
converter = (int) 'a';
f_file = file (from)+converter-1;
t_file = file (target)+converter-1;
if (from == 0)
{
sprintf (str, "%c@%c%d", type_to_char[prom], t_file, t_rank);
}
else
{
/* "normal" move: */
if (!prom) {
sprintf (str, "%c%d%c%d", f_file, f_rank, t_file, t_rank);
}
/* promotion move: */
else {
if (prom == wknight || prom == bknight) {
sprintf (str, "%c%d%c%dn", f_file, f_rank, t_file, t_rank);
}
else if (prom == wrook || prom == brook) {
sprintf (str, "%c%d%c%dr", f_file, f_rank, t_file, t_rank);
}
else if (prom == wbishop || prom == bbishop) {
sprintf (str, "%c%d%c%db", f_file, f_rank, t_file, t_rank);
}
else if (prom == wking || prom == bking)
{
sprintf (str, "%c%d%c%dk", f_file, f_rank, t_file, t_rank);
}
else
{
sprintf (str, "%c%d%c%dq", f_file, f_rank, t_file, t_rank);
}
}
}
}
void display_board (FILE *stream, int color) {
/* prints a text-based representation of the board: */
char *line_sep = "+----+----+----+----+----+----+----+----+";
char *piece_rep[14] = {"!!", " P", "*P", " N", "*N", " K", "*K", " R",
"*R", " Q", "*Q", " B", "*B", " "};
int a,b,c;
if (color % 2) {
fprintf (stream, " %s\n", line_sep);
for (a = 1; a <= 8; a++) {
fprintf (stream, "%d |", 9 - a);
for (b = 0; b <= 11; b++) {
c = 120 - a*12 + b;
if (board[c] != 0)
fprintf (stream, " %s |", piece_rep[board[c]]);
}
fprintf (stream, "\n %s\n", line_sep);
}
fprintf (stream, "\n a b c d e f g h\n\n");
}
else {
fprintf (stream, " %s\n", line_sep);
for (a = 1; a <= 8; a++) {
fprintf (stream, "%d |", a);
for (b = 0; b <= 11; b++) {
c = 24 + a*12 -b;
if (board[c] != 0)
fprintf (stream, " %s |", piece_rep[board[c]]);
}
fprintf (stream, "\n %s\n", line_sep);
}
fprintf (stream, "\n h g f e d c b a\n\n");
}
}
void init_game (void) {
/* set up a new game: */
int init_board[144] = {
0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,
0,0,7,3,11,9,5,11,3,7,0,0,
0,0,1,1,1,1,1,1,1,1,0,0,
0,0,13,13,13,13,13,13,13,13,0,0,
0,0,13,13,13,13,13,13,13,13,0,0,
0,0,13,13,13,13,13,13,13,13,0,0,
0,0,13,13,13,13,13,13,13,13,0,0,
0,0,2,2,2,2,2,2,2,2,0,0,
0,0,8,4,12,10,6,12,4,8,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0
};
memcpy (board, init_board, sizeof (init_board));
memset (moved, 0, sizeof(moved));
white_to_move = 1;
ep_square = 0;
wking_loc = 30;
bking_loc = 114;
white_castled = no_castle;
black_castled = no_castle;
result = no_result;
captures = FALSE;
/* reset_piece_square fills these in */
piece_count = 0;
Material = 0;
memset(pieces, 0, sizeof(pieces));
memset(is_promoted, 0, sizeof(is_promoted));
memset(holding, 0, sizeof(holding));
white_hand_eval = 0;
black_hand_eval = 0;
reset_piece_square ();
bookidx = 0;
book_ply = 0;
fifty = 0;
ply = 0;
phase = Opening;
}
bool is_move (char str[]) {
/* check to see if the input string is a move or not. Returns true if it
is in a move format supported by Sjeng. */
if (isalpha (str[0]) && isdigit (str[1]) && isalpha (str[2])
&& isdigit (str[3])) {
return TRUE;
}
else if (isalpha(str[0]) && str[1] == '@' && isalpha(str[2]) && isdigit(str[3]))
{
return TRUE;
}
else {
return FALSE;
}
}
void perft_debug (void) {
/* A function to debug the move gen by doing perft's, showing the board, and
accepting move input */
char input[STR_BUFF], *p;
move_s move;
int depth;
init_game ();
/* go into a loop of doing a perft(), then making the moves the user inputs
until the user enters "exit" or "quit" */
while (TRUE) {
/* get the desired depth to generate to: */
printf ("\n\nPlease enter the desired depth for perft():\n");
rinput (input, STR_BUFF, stdin);
depth = atoi (input);
/* print out the number of raw nodes for this depth: */
raw_nodes = 0;
perft (depth);
printf ("\n\nRaw nodes for depth %d: %ld\n\n", depth, raw_nodes);
/* print out the board: */
display_board (stdout, 1);
printf ("\nPlease input a move/command:\n");
rinput (input, STR_BUFF, stdin);
/* check to see if we have an exit/quit: */
for (p = input; *p; p++) *p = tolower (*p);
if (!strcmp (input, "exit") || !strcmp (input, "quit")) {
exit (EXIT_SUCCESS);
}
if (!verify_coord (input, &move)) {
/* loop until we get a legal move or an exit/quit: */
do {
printf ("\nIllegal move/command! Please input a new move/command:\n");
rinput (input, STR_BUFF, stdin);
/* check to see if we have an exit/quit: */
for (p = input; *p; p++) *p = tolower (*p);
if (!strcmp (input, "exit") || !strcmp (input, "quit")) {
exit (EXIT_SUCCESS);
}
} while (!verify_coord (input, &move));
}
make (&move, 0);
}
}
void hash_extract_pv(int level, char str[])
{
int dummy, bm;
move_s moves[MOVE_BUFF];
int num_moves;
char output[STR_BUFF];
/* avoid loop on repetitions */
level--;
if (!level) return;
if(ProbeTT(&dummy, 0, 0, &bm, &dummy, &dummy, 0) != HMISS)
{
gen(&moves[0]);
num_moves = numb_moves;
if ((bm >= 0) && (bm < num_moves))
{
comp_to_san(moves[bm], output);
make(&moves[0], bm);
if (check_legal(&moves[0], bm, 1))
{
/* only print move AFTER legal check is done */
strcat(str, "<");
strcat(str, output);
strcat(str, "> ");
hash_extract_pv(level, str);
}
unmake(&moves[0], bm);
}
}
}
void stringize_pv (char str[])
{
char output[STR_BUFF];
int i;
memset(str, 0, STR_BUFF);
for (i = 1; i < pv_length[1]; i++)
{
comp_to_san (pv[1][i], output);
make(&pv[1][i], 0);
strcat (str, output);
strcat (str, " ");
}
hash_extract_pv(7, str);
for (i = (pv_length[1]-1); i > 0; i--)
{
unmake(&pv[1][i], 0);
}
}
void post_thinking (long int score) {
/* post our thinking output: */
int i, remake = 0;
long int elapsed;
char output[STR_BUFF];
char hashpv[STR_BUFF];
/* in xboard mode, follow xboard conventions for thinking output, otherwise
output the iterative depth, human readable score, and the pv */
/* if (xb_mode) {*/
elapsed = rdifftime (rtime (), start_time);
printf ("%2d %7ld %5ld %8ld ", i_depth, score, elapsed, nodes);
/* if root move is already/still played, back it up */
/* 25-06-2000 our en passant info is unrecoverable here
so we cannot gen.... */
if (((pv[1][1].from != 0) && (board[pv[1][1].from] == npiece))
|| ((pv[1][1].from == 0) && (board[pv[1][1].target] != npiece)))
{
unmake(&pv[1][1], 0);
remake = 1;
}
for (i = 1; i < pv_length[1]; i++) {
comp_to_san (pv[1][i], output);
make(&pv[1][i], 0);
printf ("%s ", output);
}
memset(hashpv, 0, sizeof(hashpv));
hash_extract_pv(7, hashpv);
printf("%s", hashpv);
for (i = (pv_length[1]-1); i > 0; i--)
{
unmake(&pv[1][i], 0);
}
if (remake)
make(&pv[1][1], 0);
printf ("\n");
}
void post_fail_thinking(long int score, move_s *failmove)
{
/* post our thinking output: */
long int elapsed;
char output[STR_BUFF];
/* in xboard mode, follow xboard conventions for thinking output, otherwise
output the iterative depth, human readable score, and the pv */
elapsed = rdifftime (rtime (), start_time);
printf ("%2d %7ld %5ld %8ld ", i_depth, score, elapsed, nodes);
unmake(failmove, 0);
comp_to_san (*failmove, output);
make(failmove, 0);
printf ("%s !", output);
printf ("\n");
}
void post_fh_thinking(long int score, move_s *failmove)
{
/* post our thinking output: */
long int elapsed;
char output[STR_BUFF];
/* in xboard mode, follow xboard conventions for thinking output, otherwise
output the iterative depth, human readable score, and the pv */
elapsed = rdifftime (rtime (), start_time);
printf ("%2d %7ld %5ld %8ld ", i_depth, score, elapsed, nodes);
unmake(failmove, 0);
comp_to_san (*failmove, output);
make(failmove, 0);
printf ("%s !!", output);
printf ("\n");
}
void post_fl_thinking(long int score, move_s *failmove)
{
/* post our thinking output: */
long int elapsed;
char output[STR_BUFF];
/* in xboard mode, follow xboard conventions for thinking output, otherwise
output the iterative depth, human readable score, and the pv */
elapsed = rdifftime (rtime (), start_time);
printf ("%2d %7ld %5ld %8ld ", i_depth, score, elapsed, nodes);
unmake(failmove, 0);
comp_to_san (*failmove, output);
make(failmove, 0);
printf ("%s ??", output);
printf ("\n");
}
void post_stat_thinking(void)
{
/* post our thinking output: */
long int elapsed;
elapsed = rdifftime (rtime (), start_time);
if (xb_mode == 1)
{
printf ("stat01: %ld %ld %d %d %d\n", elapsed, nodes, i_depth, moveleft, movetotal);
}
else if (xb_mode == 2)
{
printf ("stat01: %ld %ld %d %d %d %s\n", elapsed, nodes, i_depth, moveleft, movetotal, searching_move);
}
}
void print_move (move_s moves[], int m, FILE *stream) {
/* print out a move */
char move[STR_BUFF];
comp_to_san (moves[m], move);
fprintf (stream, "%s", move);
}
void rdelay (int time_in_s) {
/* My delay function to cause a delay of time_in_s seconds */
rtime_t time1, time2;
long int timer = 0;
time1 = rtime ();
while (timer/100 < time_in_s) {
time2 = rtime ();
timer = rdifftime (time2, time1);
}
}
long int rdifftime (rtime_t end, rtime_t start) {
/* determine the time taken between start and the current time in
centi-seconds */
/* using ftime(): */
#if defined(HAVE_SYS_TIMEB_H) && (defined(HAVE_FTIME) || defined(HAVE_GETTIMEOFDAY))
return ((end.time-start.time)*100 + (end.millitm-start.millitm)/10);
/* -------------------------------------------------- */
/* using time(): */
#else
return (100*(long int) difftime (end, start));
#endif
}
void check_piece_square (void)
{
int i;
for (i = 1; i <= piece_count; i++)
{
if (squares[pieces[i]] != i && pieces[i] != 0)
{
printf("Piece->square->piece inconsistency\n");
display_board(stdout, 0);
DIE;
}
if (board[pieces[i]] == npiece && pieces[i] != 0)
{
printf("Board/Piece->square inconsistency\n");
display_board(stdout, 0);
DIE;
}
if (pieces[i] == 0 && squares[pieces[i]] != 0)
{
printf("Zero-ed piece inconsistency\n");
display_board(stdout, 0);
DIE;
}
}
for (i = 0; i < 144; i++)
{
if ((board[i] == npiece || board[i] == frame) && squares[i] != 0)
{
printf("Empty square has piece pointer\n");
display_board(stdout, 0);
DIE;
}
if (board[i] != npiece && board[i] != frame && squares[i] == 0)
{
printf("Filled square %d has no piece pointer\n", i);
display_board(stdout, 0);
DIE;
}
if (pieces[squares[i]] != i && squares[i] != 0)
{
printf("Square->piece->square inconsistency\n");
display_board(stdout, 0);
DIE;
}
}
}
void reset_piece_square (void) {
/* we use piece number 0 to show a piece taken off the board, so don't
use that piece number for other things: */
/* reset the piece / square tables: */
int i, j, promoted_board[144];
memset(promoted_board, 0, sizeof(promoted_board));
/* save our promoted info as we cant determine it from the board */
for (i = 1, j = 1; j <= piece_count; i++) {
if(is_promoted[i]) {
promoted_board[pieces[i]] = 1;
}
if (pieces[i] != 0) j++;
}
Material = 0;
piece_count = 0;
memset(pieces, 0, sizeof(pieces));
memset(is_promoted, 0, sizeof(is_promoted));
pieces[0] = 0;
for (i = 26; i < 118; i++)
if (board[i] && (board[i] < npiece)) {
AddMaterial(board[i]);
piece_count += 1;
pieces[piece_count] = i;
squares[i] = piece_count;
/* restored promoted info */
if (promoted_board[i])
is_promoted[piece_count] = 1;
}
else
squares[i] = 0;
}
void rinput (char str[], int n, FILE *stream) {
/* My input function - reads in up to n-1 characters from stream, or until
we encounter a \n or an EOF. Appends a null character at the end of the
string, and stores the string in str[] */
int ch, i = 0;
while ((ch = getc (stream)) != (int) '\n' && ch != EOF) {
if (i < n-1) {
str[i++] = ch;
}
}
str [i] = '\0';
}
rtime_t rtime (void) {
/* using ftime(): */
#if defined(HAVE_FTIME) && defined(HAVE_SYS_TIMEB_H)
rtime_t temp;
ftime(&temp);
return (temp);
/* -------------------------------------------------- */
/* gettimeofday replacement by Daniel Clausen */
#else
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_SYS_TIMEB_H)
rtime_t temp;
struct timeval tmp;
gettimeofday(&tmp, NULL);
temp.time = tmp.tv_sec;
temp.millitm = tmp.tv_usec / 1000;
temp.timezone = 0;
temp.dstflag = 0;
return (temp);
#else
return (time (0));
#endif
#endif
}
void start_up (void) {
/* things to do on start up of the program */
printf("\nSjeng version " VERSION ", Copyright (C) 2000-2001 Gian-Carlo Pascutto\n\n"
"Sjeng comes with ABSOLUTELY NO WARRANTY; for details type 'warranty'\n"
"This is free software, and you are welcome to redistribute it\n"
"under certain conditions; type 'distribution'\n\n");
}
void toggle_bool (bool *var) {
/* toggle FALSE -> TRUE, TRUE -> FALSE */
if (*var) {
*var = FALSE;
}
else {
*var = TRUE;
}
}
void tree_debug (void) {
/* A function to make a tree of output at a certain depth and print out
the number of nodes: */
char input[STR_BUFF];
FILE *stream;
int depth;
init_game ();
/* get the desired depth to generate to: */
printf ("\nPlease enter the desired depth:\n");
rinput (input, STR_BUFF, stdin);
depth = atoi (input);
/* does the user want to output tree () ? */
printf ("\nDo you want tree () output? (y/n)\n");
rinput (input, STR_BUFF, stdin);
if (input[0] == 'y') {
/* get our output file: */
printf ("\nPlease enter the name of the output file for tree ():\n");
rinput (input, STR_BUFF, stdin);
if ((stream = fopen (input, "w")) == NULL) {
fprintf (stderr, "Couldn't open file %s\n", input);
}
/* does the user want to output diagrams? */
printf ("\nDo you want to output diagrams? (y/n)\n");
rinput (input, STR_BUFF, stdin);
tree (depth, 0, stream, input);
}
/* print out the number of raw nodes for this depth: */
raw_nodes = 0;
perft (depth);
printf ("\n\n%s\nRaw nodes for depth %d: %ld\n%s\n\n", divider,
depth, raw_nodes, divider);
}
bool verify_coord (char input[], move_s *move) {
/* checks to see if the move the user entered was legal or not, returns
true if the move was legal, and stores the legal move inside move */
move_s moves[MOVE_BUFF];
int num_moves, i;
char comp_move[6];
bool legal = FALSE;
bool mate;
if (Variant == Losers)
{
captures = TRUE;
num_moves = 0;
gen (&moves[0]);
num_moves = numb_moves;
captures = FALSE;
mate = TRUE;
for (i = 0; i < num_moves; i++)
{
make (&moves[0], i);
/* check to see if our move is legal: */
if (check_legal (&moves[0], i, TRUE))
{
mate = FALSE;
unmake(&moves[0], i);