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+ 30 #include "rules.h"
+ 31 #include "chess.h"
+ 32 #include <string.h>
+ 33 #include <stdlib.h>
+ 34 #include <sys/time.h>
+ 35
+ 36 static GameState gamestate_copy_sim(GameState *gamestate) {
+ 37 GameState simulation = *gamestate;
+ 38 if (simulation.lastmove) {
+ 39 MoveList *lastmovecopy = malloc(sizeof(MoveList));
+ 40 *lastmovecopy = *(simulation.lastmove);
+ 41 simulation.movelist = simulation.lastmove = lastmovecopy;
+ 42 }
+ 43
+ 44 return simulation;
+ 45 }
+ 46
+ 47 void gamestate_init(GameState *gamestate) {
+ 48 memset(gamestate, 0, sizeof(GameState));
+ 49
+ 50 Board initboard = {
+ 51 {WROOK, WKNIGHT, WBISHOP, WQUEEN, WKING, WBISHOP, WKNIGHT, WROOK},
+ 52 {WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN, WPAWN},
+ 53 {0, 0, 0, 0, 0, 0, 0, 0},
+ 54 {0, 0, 0, 0, 0, 0, 0, 0},
+ 55 {0, 0, 0, 0, 0, 0, 0, 0},
+ 56 {0, 0, 0, 0, 0, 0, 0, 0},
+ 57 {BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN, BPAWN},
+ 58 {BROOK, BKNIGHT, BBISHOP, BQUEEN, BKING, BBISHOP, BKNIGHT, BROOK}
+ 59 };
+ 60 memcpy(gamestate->board, initboard, sizeof(Board));
+ 61 }
+ 62
+ 63 void gamestate_cleanup(GameState *gamestate) {
+ 64 MoveList *elem;
+ 65 elem = gamestate->movelist;
+ 66 while (elem) {
+ 67 MoveList *cur = elem;
+ 68 elem = elem->next;
+ 69 free(cur);
+ 70 };
+ 71 }
+ 72
+ 73
+ 74 static void format_move(GameState *gamestate, Move *move) {
+ 75 char *string = move->string;
+ 76
+ 77
+ 78 memset(string, 0, 8);
+ 79
+ 80
+ 81 if ((move->piece&PIECE_MASK) == KING &&
+ 82 abs(move->tofile-move->fromfile) == 2) {
+ 83 if (move->tofile==fileidx('c')) {
+ 84 memcpy(string, "O-O-O", 5);
+ 85 } else {
+ 86 memcpy(string, "O-O", 3);
+ 87 }
+ 88 }
+ 89
+ 90
+ 91 string[0] = getpiecechr(move->piece);
+ 92 int idx = string[0] ? 1 : 0;
+ 93
+ 94
+ 95 uint8_t piece = move->piece & PIECE_MASK;
+ 96 if (piece == PAWN) {
+ 97 if (move->capture) {
+ 98 string[idx++] = filechr(move->fromfile);
+ 99 }
+100 } else if (piece != KING) {
+101 Move threats[16];
+102 uint8_t threatcount;
+103 get_real_threats(gamestate, move->torow, move->tofile,
+104 move->piece&COLOR_MASK, threats, &threatcount);
+105 if (threatcount > 1) {
+106 int ambrows = 0, ambfiles = 0;
+107 for (uint8_t i = 0 ; i < threatcount ; i++) {
+108 if (threats[i].fromrow == move->fromrow) {
+109 ambrows++;
+110 }
+111 if (threats[i].fromfile == move->fromfile) {
+112 ambfiles++;
+113 }
+114 }
+115
+116 if (ambrows > 1) {
+117 string[idx++] = filechr(move->fromfile);
+118 }
+119
+120 if (ambfiles > 1) {
+121 string[idx++] = filechr(move->fromrow);
+122 }
+123 }
+124 }
+125
+126
+127 if (move->capture) {
+128 string[idx++] = 'x';
+129 }
+130
+131
+132 string[idx++] = filechr(move->tofile);
+133 string[idx++] = rowchr(move->torow);
+134
+135
+136 if (move->promotion) {
+137 string[idx++] = '=';
+138 string[idx++] = getpiecechr(move->promotion);
+139 }
+140
+141
+142 if (move->check) {
+143
+144 string[idx++] = gamestate->checkmate?'#':'+';
+145 }
+146 }
+147
+148 static void addmove(GameState* gamestate, Move *move) {
+149 MoveList *elem = malloc(sizeof(MoveList));
+150 elem->next = NULL;
+151 elem->move = *move;
+152
+153 struct timeval curtimestamp;
+154 gettimeofday(&curtimestamp, NULL);
+155 elem->move.timestamp.tv_sec = curtimestamp.tv_sec;
+156 elem->move.timestamp.tv_usec = curtimestamp.tv_usec;
+157
+158 if (gamestate->lastmove) {
+159 struct movetimeval *lasttstamp = &(gamestate->lastmove->move.timestamp);
+160 uint64_t sec = curtimestamp.tv_sec - lasttstamp->tv_sec;
+161 suseconds_t micros;
+162 if (curtimestamp.tv_usec < lasttstamp->tv_usec) {
+163 micros = 1e6L-(lasttstamp->tv_usec - curtimestamp.tv_usec);
+164 sec--;
+165 } else {
+166 micros = curtimestamp.tv_usec - lasttstamp->tv_usec;
+167 }
+168
+169 elem->move.movetime.tv_sec = sec;
+170 elem->move.movetime.tv_usec = micros;
+171
+172 gamestate->lastmove->next = elem;
+173 gamestate->lastmove = elem;
+174 } else {
+175 elem->move.movetime.tv_usec = 0;
+176 elem->move.movetime.tv_sec = 0;
+177 gamestate->movelist = gamestate->lastmove = elem;
+178 }
+179 }
+180
+181 char getpiecechr(uint8_t piece) {
+182 switch (piece & PIECE_MASK) {
+183 case ROOK: return 'R';
+184 case KNIGHT: return 'N';
+185 case BISHOP: return 'B';
+186 case QUEEN: return 'Q';
+187 case KING: return 'K';
+188 default: return '\0';
+189 }
+190 }
+191
+192 uint8_t getpiece(char c) {
+193 switch (c) {
+194 case 'R': return ROOK;
+195 case 'N': return KNIGHT;
+196 case 'B': return BISHOP;
+197 case 'Q': return QUEEN;
+198 case 'K': return KING;
+199 default: return 0;
+200 }
+201 }
+202
+203 static void apply_move_impl(GameState *gamestate, Move *move, _Bool simulate) {
+204 uint8_t piece = move->piece & PIECE_MASK;
+205 uint8_t color = move->piece & COLOR_MASK;
+206
+207
+208 if (move->capture && piece == PAWN &&
+209 mdst(gamestate->board, move) == 0) {
+210 gamestate->board[move->fromrow][move->tofile] = 0;
+211 }
+212
+213
+214 for (uint8_t file = 0 ; file < 8 ; file++) {
+215 gamestate->board[3][file] &= ~ENPASSANT_THREAT;
+216 gamestate->board[4][file] &= ~ENPASSANT_THREAT;
+217 }
+218
+219
+220 if (piece == PAWN && (
+221 (move->fromrow == 1 && move->torow == 3) ||
+222 (move->fromrow == 6 && move->torow == 4))) {
+223 move->piece |= ENPASSANT_THREAT;
+224 }
+225
+226
+227 msrc(gamestate->board, move) = 0;
+228 if (move->promotion) {
+229 mdst(gamestate->board, move) = move->promotion;
+230 } else {
+231 mdst(gamestate->board, move) = move->piece;
+232 }
+233
+234
+235 if (piece == KING && move->fromfile == fileidx('e')) {
+236
+237 if (move->tofile == fileidx('g')) {
+238 gamestate->board[move->torow][fileidx('h')] = 0;
+239 gamestate->board[move->torow][fileidx('f')] = color|ROOK;
+240 } else if (move->tofile == fileidx('c')) {
+241 gamestate->board[move->torow][fileidx('a')] = 0;
+242 gamestate->board[move->torow][fileidx('d')] = color|ROOK;
+243 }
+244 }
+245
+246 if (!simulate) {
+247 if (!move->string[0]) {
+248 format_move(gamestate, move);
+249 }
+250 }
+251
+252 addmove(gamestate, move);
+253 }
+254
+255 void apply_move(GameState *gamestate, Move *move) {
+256 apply_move_impl(gamestate, move, 0);
+257 }
+258
+259 static int validate_move_rules(GameState *gamestate, Move *move) {
+260
+261 if (!chkidx(move)) {
+262 return INVALID_POSITION;
+263 }
+264
+265
+266 if (move->fromfile == move->tofile && move->fromrow == move->torow) {
+267 return INVALID_MOVE_SYNTAX;
+268 }
+269
+270
+271 if ((msrc(gamestate->board, move)&(PIECE_MASK|COLOR_MASK))
+272 != (move->piece&(PIECE_MASK|COLOR_MASK))) {
+273 return INVALID_POSITION;
+274 }
+275
+276
+277 if ((mdst(gamestate->board, move) & COLOR_MASK)
+278 == (move->piece & COLOR_MASK)) {
+279 return RULES_VIOLATED;
+280 }
+281
+282
+283 if ((mdst(gamestate->board, move) == 0 && move->capture) ||
+284 (mdst(gamestate->board, move) != 0 && !move->capture)) {
+285 return INVALID_MOVE_SYNTAX;
+286 }
+287
+288
+289 _Bool chkrules;
+290 switch (move->piece & PIECE_MASK) {
+291 case PAWN:
+292 chkrules = pawn_chkrules(gamestate, move) &&
+293 !pawn_isblocked(gamestate, move);
+294 break;
+295 case ROOK:
+296 chkrules = rook_chkrules(move) &&
+297 !rook_isblocked(gamestate, move);
+298 break;
+299 case KNIGHT:
+300 chkrules = knight_chkrules(move);
+301 break;
+302 case BISHOP:
+303 chkrules = bishop_chkrules(move) &&
+304 !bishop_isblocked(gamestate, move);
+305 break;
+306 case QUEEN:
+307 chkrules = queen_chkrules(move) &&
+308 !queen_isblocked(gamestate, move);
+309 break;
+310 case KING:
+311 chkrules = king_chkrules(gamestate, move) &&
+312 !king_isblocked(gamestate, move);
+313 break;
+314 default:
+315 return INVALID_MOVE_SYNTAX;
+316 }
+317
+318 return chkrules ? VALID_MOVE_SEMANTICS : RULES_VIOLATED;
+319 }
+320
+321 int validate_move(GameState *gamestate, Move *move) {
+322
+323 int result = validate_move_rules(gamestate, move);
+324
+325
+326 if (result != VALID_MOVE_SEMANTICS) {
+327 return result;
+328 }
+329
+330
+331 uint8_t piececolor = (move->piece & COLOR_MASK);
+332
+333 uint8_t mykingfile = 0, mykingrow = 0, opkingfile = 0, opkingrow = 0;
+334 for (uint8_t row = 0 ; row < 8 ; row++) {
+335 for (uint8_t file = 0 ; file < 8 ; file++) {
+336 if (gamestate->board[row][file] ==
+337 (piececolor == WHITE?WKING:BKING)) {
+338 mykingfile = file;
+339 mykingrow = row;
+340 } else if (gamestate->board[row][file] ==
+341 (piececolor == WHITE?BKING:WKING)) {
+342 opkingfile = file;
+343 opkingrow = row;
+344 }
+345 }
+346 }
+347
+348
+349 GameState simulation = gamestate_copy_sim(gamestate);
+350 Move simmove = *move;
+351 apply_move_impl(&simulation, &simmove, 1);
+352
+353
+354 if (is_covered(&simulation, mykingrow, mykingfile,
+355 opponent_color(piececolor))) {
+356
+357 gamestate_cleanup(&simulation);
+358 if ((move->piece & PIECE_MASK) == KING) {
+359 return KING_MOVES_INTO_CHECK;
+360 } else {
+361
+362 return gamestate->lastmove->move.check ?
+363 KING_IN_CHECK : PIECE_PINNED;
+364 }
+365 }
+366
+367
+368 Move threats[16];
+369 uint8_t threatcount;
+370 move->check = get_threats(&simulation, opkingrow, opkingfile,
+371 piececolor, threats, &threatcount);
+372
+373 if (move->check) {
+374
+375 _Bool canescape = 0;
+376 for (int dr = -1 ; dr <= 1 && !canescape ; dr++) {
+377 for (int df = -1 ; df <= 1 && !canescape ; df++) {
+378 if (!(dr == 0 && df == 0) &&
+379 isidx(opkingrow + dr) && isidx(opkingfile + df)) {
+380
+381
+382 if ((simulation.board[opkingrow + dr][opkingfile + df]
+383 & COLOR_MASK) != opponent_color(piececolor)) {
+384 canescape |= !is_covered(&simulation,
+385 opkingrow + dr, opkingfile + df, piececolor);
+386 }
+387 }
+388 }
+389 }
+390
+391 if (!canescape && threatcount == 1) {
+392 canescape = is_attacked(&simulation, threats[0].fromrow,
+393 threats[0].fromfile, opponent_color(piececolor));
+394 }
+395
+396
+397 if (!canescape && threatcount == 1) {
+398 Move *threat = &(threats[0]);
+399 uint8_t threatpiece = threat->piece & PIECE_MASK;
+400
+401
+402 if (threatpiece == BISHOP || threatpiece == ROOK
+403 || threatpiece == QUEEN) {
+404 if (threat->fromrow == threat->torow) {
+405
+406 int d = threat->tofile > threat->fromfile ? 1 : -1;
+407 uint8_t file = threat->fromfile;
+408 while (!canescape && file != threat->tofile - d) {
+409 file += d;
+410 canescape |= is_protected(&simulation,
+411 threat->torow, file, opponent_color(piececolor));
+412 }
+413 } else if (threat->fromfile == threat->tofile) {
+414
+415 int d = threat->torow > threat->fromrow ? 1 : -1;
+416 uint8_t row = threat->fromrow;
+417 while (!canescape && row != threat->torow - d) {
+418 row += d;
+419 canescape |= is_protected(&simulation,
+420 row, threat->tofile, opponent_color(piececolor));
+421 }
+422 } else {
+423
+424 int dr = threat->torow > threat->fromrow ? 1 : -1;
+425 int df = threat->tofile > threat->fromfile ? 1 : -1;
+426
+427 uint8_t row = threat->fromrow;
+428 uint8_t file = threat->fromfile;
+429 while (!canescape && file != threat->tofile - df
+430 && row != threat->torow - dr) {
+431 row += dr;
+432 file += df;
+433 canescape |= is_protected(&simulation, row, file,
+434 opponent_color(piececolor));
+435 }
+436 }
+437 }
+438 }
+439
+440 if (!canescape) {
+441 gamestate->checkmate = 1;
+442 }
+443 }
+444
+445 gamestate_cleanup(&simulation);
+446
+447 return VALID_MOVE_SEMANTICS;
+448 }
+449
+450 _Bool get_threats(GameState *gamestate, uint8_t row, uint8_t file,
+451 uint8_t color, Move *threats, uint8_t *threatcount) {
+452 Move candidates[32];
+453 int candidatecount = 0;
+454 for (uint8_t r = 0 ; r < 8 ; r++) {
+455 for (uint8_t f = 0 ; f < 8 ; f++) {
+456 if ((gamestate->board[r][f] & COLOR_MASK) == color) {
+457
+458 memset(&(candidates[candidatecount]), 0, sizeof(Move));
+459 candidates[candidatecount].piece = gamestate->board[r][f];
+460 candidates[candidatecount].fromrow = r;
+461 candidates[candidatecount].fromfile = f;
+462 candidates[candidatecount].torow = row;
+463 candidates[candidatecount].tofile = file;
+464 candidatecount++;
+465
+466
+467 memcpy(&(candidates[candidatecount]),
+468 &(candidates[candidatecount-1]), sizeof(Move));
+469 candidates[candidatecount].capture = 1;
+470 candidatecount++;
+471 }
+472 }
+473 }
+474
+475 if (threatcount) {
+476 *threatcount = 0;
+477 }
+478
+479
+480 _Bool result = 0;
+481
+482 for (int i = 0 ; i < candidatecount ; i++) {
+483 if (validate_move_rules(gamestate, &(candidates[i]))
+484 == VALID_MOVE_SEMANTICS) {
+485 result = 1;
+486 if (threats && threatcount) {
+487 threats[(*threatcount)++] = candidates[i];
+488 }
+489 }
+490 }
+491
+492 return result;
+493 }
+494
+495 _Bool is_pinned(GameState *gamestate, Move *move) {
+496 uint8_t color = move->piece & COLOR_MASK;
+497
+498 uint8_t kingfile = 0, kingrow = 0;
+499 for (uint8_t row = 0 ; row < 8 ; row++) {
+500 for (uint8_t file = 0 ; file < 8 ; file++) {
+501 if (gamestate->board[row][file] == (color|KING)) {
+502 kingfile = file;
+503 kingrow = row;
+504 }
+505 }
+506 }
+507
+508 GameState simulation = gamestate_copy_sim(gamestate);
+509 Move simmove = *move;
+510 apply_move(&simulation, &simmove);
+511 _Bool covered = is_covered(&simulation,
+512 kingrow, kingfile, opponent_color(color));
+513 gamestate_cleanup(&simulation);
+514
+515 return covered;
+516 }
+517
+518 _Bool get_real_threats(GameState *gamestate, uint8_t row, uint8_t file,
+519 uint8_t color, Move *threats, uint8_t *threatcount) {
+520
+521 if (threatcount) {
+522 *threatcount = 0;
+523 }
+524
+525 Move candidates[16];
+526 uint8_t candidatecount;
+527 if (get_threats(gamestate, row, file, color, candidates, &candidatecount)) {
+528
+529 _Bool result = 0;
+530 uint8_t kingfile = 0, kingrow = 0;
+531 for (uint8_t row = 0 ; row < 8 ; row++) {
+532 for (uint8_t file = 0 ; file < 8 ; file++) {
+533 if (gamestate->board[row][file] == (color|KING)) {
+534 kingfile = file;
+535 kingrow = row;
+536 }
+537 }
+538 }
+539
+540 for (uint8_t i = 0 ; i < candidatecount ; i++) {
+541 GameState simulation = gamestate_copy_sim(gamestate);
+542 Move simmove = candidates[i];
+543 apply_move(&simulation, &simmove);
+544 if (!is_covered(&simulation, kingrow, kingfile,
+545 opponent_color(color))) {
+546 result = 1;
+547 if (threats && threatcount) {
+548 threats[(*threatcount)++] = candidates[i];
+549 }
+550 }
+551 }
+552
+553 return result;
+554 } else {
+555 return 0;
+556 }
+557 }
+558
+559 static int getlocation(GameState *gamestate, Move *move) {
+560
+561 uint8_t color = move->piece & COLOR_MASK;
+562 _Bool incheck = gamestate->lastmove?gamestate->lastmove->move.check:0;
+563
+564 Move threats[16], *threat = NULL;
+565 uint8_t threatcount;
+566
+567 if (get_threats(gamestate, move->torow, move->tofile, color,
+568 threats, &threatcount)) {
+569
+570 int reason = INVALID_POSITION;
+571
+572
+573 for (uint8_t i = 0 ; i < threatcount ; i++) {
+574 if ((threats[i].piece & (PIECE_MASK | COLOR_MASK))
+575 == move->piece &&
+576 (move->fromrow == POS_UNSPECIFIED ||
+577 move->fromrow == threats[i].fromrow) &&
+578 (move->fromfile == POS_UNSPECIFIED ||
+579 move->fromfile == threats[i].fromfile)) {
+580
+581 if (threat) {
+582 return AMBIGUOUS_MOVE;
+583 } else {
+584
+585 if (is_pinned(gamestate, &(threats[i]))) {
+586 reason = incheck?KING_IN_CHECK:PIECE_PINNED;
+587 } else {
+588 threat = &(threats[i]);
+589 }
+590 }
+591 }
+592 }
+593
+594
+595 if (!threat) {
+596 return reason;
+597 }
+598
+599 memcpy(move, threat, sizeof(Move));
+600 return VALID_MOVE_SYNTAX;
+601 } else {
+602 return INVALID_POSITION;
+603 }
+604 }
+605
+606 int eval_move(GameState *gamestate, char *mstr, Move *move, uint8_t color) {
+607 memset(move, 0, sizeof(Move));
+608 move->fromfile = POS_UNSPECIFIED;
+609 move->fromrow = POS_UNSPECIFIED;
+610
+611 size_t len = strlen(mstr);
+612 if (len < 1 || len > 6) {
+613 return INVALID_MOVE_SYNTAX;
+614 }
+615
+616
+617 if (mstr[len-1] == '+') {
+618 len--; mstr[len] = '\0';
+619 move->check = 1;
+620 } else if (mstr[len-1] == '#') {
+621 len--; mstr[len] = '\0';
+622
+623 }
+624
+625
+626 if (len > 3 && mstr[len-2] == '=') {
+627 move->promotion = getpiece(mstr[len-1]);
+628 if (!move->promotion) {
+629 return INVALID_MOVE_SYNTAX;
+630 } else {
+631 move->promotion |= color;
+632 len -= 2;
+633 mstr[len] = 0;
+634 }
+635 }
+636
+637 if (len == 2) {
+638
+639 move->piece = PAWN;
+640 move->tofile = fileidx(mstr[0]);
+641 move->torow = rowidx(mstr[1]);
+642 } else if (len == 3) {
+643 if (strcmp(mstr, "O-O") == 0) {
+644
+645 move->piece = KING;
+646 move->fromfile = fileidx('e');
+647 move->tofile = fileidx('g');
+648 move->fromrow = move->torow = color == WHITE ? 0 : 7;
+649 } else {
+650
+651 move->piece = getpiece(mstr[0]);
+652 move->tofile = fileidx(mstr[1]);
+653 move->torow = rowidx(mstr[2]);
+654 }
+655 } else if (len == 4) {
+656 move->piece = getpiece(mstr[0]);
+657 if (!move->piece) {
+658 move->piece = PAWN;
+659 move->fromfile = fileidx(mstr[0]);
+660 }
+661 if (mstr[1] == 'x') {
+662
+663 move->capture = 1;
+664 } else {
+665
+666 if (isfile(mstr[1])) {
+667 move->fromfile = fileidx(mstr[1]);
+668 if (move->piece == PAWN) {
+669 move->piece = 0;
+670 }
+671 } else {
+672 move->fromrow = rowidx(mstr[1]);
+673 }
+674 }
+675 move->tofile = fileidx(mstr[2]);
+676 move->torow = rowidx(mstr[3]);
+677 } else if (len == 5) {
+678 if (strcmp(mstr, "O-O-O") == 0) {
+679
+680 move->piece = KING;
+681 move->fromfile = fileidx('e');
+682 move->tofile = fileidx('c');
+683 move->fromrow = move->torow = color == WHITE ? 0 : 7;
+684 } else {
+685 move->piece = getpiece(mstr[0]);
+686 if (mstr[2] == 'x') {
+687 move->capture = 1;
+688 if (move->piece) {
+689
+690 move->fromfile = fileidx(mstr[1]);
+691 } else {
+692
+693 move->piece = PAWN;
+694 move->fromfile = fileidx(mstr[0]);
+695 move->fromrow = rowidx(mstr[1]);
+696 }
+697 } else {
+698
+699 move->fromfile = fileidx(mstr[1]);
+700 move->fromrow = rowidx(mstr[2]);
+701 }
+702 move->tofile = fileidx(mstr[3]);
+703 move->torow = rowidx(mstr[4]);
+704 }
+705 } else if (len == 6) {
+706
+707 if (mstr[3] == 'x') {
+708 move->capture = 1;
+709 move->piece = getpiece(mstr[0]);
+710 move->fromfile = fileidx(mstr[1]);
+711 move->fromrow = rowidx(mstr[2]);
+712 move->tofile = fileidx(mstr[4]);
+713 move->torow = rowidx(mstr[5]);
+714 }
+715 }
+716
+717
+718 if (move->piece) {
+719 if (move->piece == PAWN
+720 && move->torow == (color==WHITE?7:0)
+721 && !move->promotion) {
+722 return NEED_PROMOTION;
+723 }
+724
+725 move->piece |= color;
+726 if (move->fromfile == POS_UNSPECIFIED
+727 || move->fromrow == POS_UNSPECIFIED) {
+728 return getlocation(gamestate, move);
+729 } else {
+730 return chkidx(move) ? VALID_MOVE_SYNTAX : INVALID_POSITION;
+731 }
+732 } else {
+733 return INVALID_MOVE_SYNTAX;
+734 }
+735 }
+736
+737 _Bool is_protected(GameState *gamestate, uint8_t row, uint8_t file,
+738 uint8_t color) {
+739
+740 Move threats[16];
+741 uint8_t threatcount;
+742 if (get_real_threats(gamestate, row, file, color, threats, &threatcount)) {
+743 for (int i = 0 ; i < threatcount ; i++) {
+744 if (threats[i].piece != (color|KING)) {
+745 return 1;
+746 }
+747 }
+748 return 0;
+749 } else {
+750 return 0;
+751 }
+752 }
+753
+754 uint16_t remaining_movetime(GameInfo *gameinfo, GameState *gamestate,
+755 uint8_t color) {
+756 if (!gameinfo->timecontrol) {
+757 return 0;
+758 }
+759
+760 if (gamestate->movelist) {
+761 uint16_t time = gameinfo->time;
+762 suseconds_t micros = 0;
+763
+764 MoveList *movelist = color == WHITE ?
+765 gamestate->movelist : gamestate->movelist->next;
+766
+767 while (movelist) {
+768 time += gameinfo->addtime;
+769
+770 struct movetimeval *movetime = &(movelist->move.movetime);
+771 if (movetime->tv_sec >= time) {
+772 return 0;
+773 }
+774
+775 time -= movetime->tv_sec;
+776 micros += movetime->tv_usec;
+777
+778 movelist = movelist->next ? movelist->next->next : NULL;
+779 }
+780
+781 time_t sec;
+782 movelist = gamestate->lastmove;
+783 if ((movelist->move.piece & COLOR_MASK) != color) {
+784 struct movetimeval *lastmovetstamp = &(movelist->move.timestamp);
+785 struct timeval currenttstamp;
+786 gettimeofday(¤ttstamp, NULL);
+787 micros += currenttstamp.tv_usec - lastmovetstamp->tv_usec;
+788 sec = currenttstamp.tv_sec - lastmovetstamp->tv_sec;
+789 if (sec >= time) {
+790 return 0;
+791 }
+792
+793 time -= sec;
+794 }
+795
+796 sec = micros / 1e6L;
+797
+798 if (sec >= time) {
+799 return 0;
+800 }
+801
+802 time -= sec;
+803
+804 return time;
+805 } else {
+806 return gameinfo->time;
+807 }
+808 }
+
+
+
+