fairymax.c

   1 /***************************************************************************/\r
   2 /*                               fairy-Max,                                */\r
   3 /* Version of the sub-2KB (source) micro-Max Chess program, fused to a     */\r
   4 /* generic WinBoard interface, loading its move-generator tables from file */\r
   5 /***************************************************************************/\r
   6 \r
   7      /*****************************************************************/\r
   8      /*                      LICENCE NOTIFICATION                     */\r
   9      /* Fairy-Max 4.8 is free software, and you have my permission do */\r
  10      /* with it whatever you want, whether it is commercial or not.   */\r
  11      /* Note, however, that Fairy-Max can easily be configured through*/\r
  12      /* its fmax.ini file to play Chess variants that are legally pro-*/\r
  13      /* tected by patents, and that to do so would also require per-  */\r
  14      /* mission of the holders of such patents. No guarantees are     */\r
  15      /* given that Fairy-Max does anything in particular, or that it  */\r
  16      /* would not wreck the hardware it runs on, and running it is    */\r
  17      /* entirely for your own risk.  H.G,Muller, author of Fairy-Max  */\r
  18      /*****************************************************************/\r
  19 \r
  20 #define MULTIPATH\r
  21 #define VERSION "4.8S"\r
  22 \r
  23 #include <stdio.h>\r
  24 #include <stdlib.h>\r
  25 #include <string.h>\r
  26 #include <signal.h>\r
  27 #include <time.h>\r
  28 \r
  29 #ifndef INI_FILE \r
  30 #define INI_FILE "fmax.ini"\r
  31 #endif\r
  32 \r
  33 #ifdef WIN32 \r
  34 #    include <windows.h>\r
  35 #    define CPUtime 1000.*clock\r
  36 #else\r
  37 #    include <sys/time.h>\r
  38 #    include <sys/times.h>\r
  39 #    include <unistd.h>\r
  40      int GetTickCount() // with thanks to Tord\r
  41      {  struct timeval t;\r
  42         gettimeofday(&t, NULL);\r
  43         return t.tv_sec*1000 + t.tv_usec/1000;\r
  44      }\r
  45      double CPUtime()\r
  46      {  // get CPU time used by process, converted to 'MILLICLOCKS'\r
  47         struct tms cpuTimes;\r
  48         static int cps = 0;\r
  49         if(!cps) cps = sysconf(_SC_CLK_TCK);\r
  50         times(&cpuTimes);\r
  51         return ((double)(cpuTimes.tms_utime + cpuTimes.tms_stime) * CLOCKS_PER_SEC * 1000)/cps;\r
  52      }\r
  53 #endif\r
  54 \r
  55 int StartKey;\r
  56 \r
  57 #define EMPTY -1\r
  58 #define WHITE 0\r
  59 #define BLACK 16\r
  60 \r
  61 #define STATE 128\r
  62 \r
  63 /* The following macros indicate the differences between Fairy-Max and its */\r
  64 /* dedicated Shatranj derivative ShaMax so that these can now be compiled  */\r
  65 /* from the same unified source file.                                      */\r
  66 /* Compile with gcc option -DSHATRANJ to build ShaMax.                     */\r
  67 #ifdef SHATRANJ\r
  68 #    define FAC 175\r
  69 #    define EG  13\r
  70 #    define NAME "ShaMax"\r
  71 #    define SHAMAX(x) x\r
  72 #    define FMAX(x)\r
  73 #else\r
  74 #    define FAC 128\r
  75 #    define EG  10\r
  76 #    define NAME "Pair-o-Max"\r
  77 #    define SHAMAX(x)\r
  78 #    define FMAX(x) x\r
  79 #endif\r
  80 \r
  81 /* make unique integer from engine move representation */\r
  82 #define PACK_MOVE 256*K + L + (PromPiece << 16) + (GT<<24);\r
  83 \r
  84 /* convert intger argument back to engine move representation */\r
  85 #define UNPACK_MOVE(A) K = (A)>>8 & 255; L = (A) & 255; PromPiece = (A)>>16 & 255; GT = (A)>>24 & 255;\r
  86 \r
  87 /* Global variables visible to engine. Normally they */\r
  88 /* would be replaced by the names under which these  */\r
  89 /* are known to your engine, so that they can be     */\r
  90 /* manipulated directly by the interface.            */\r
  91 \r
  92 int Side;\r
  93 int Move;\r
  94 int PromPiece;\r
  95 int Result;\r
  96 int TimeLeft;\r
  97 int MovesLeft;\r
  98 int MaxDepth;\r
  99 int Post;\r
 100 int Fifty;\r
 101 int GameNr;\r
 102 int Resign;\r
 103 int Cambodian;\r
 104 int Threshold = 800;\r
 105 int Score;\r
 106 int makruk;\r
 107 int prom, pm, gating, succession;\r
 108 char piecename[32], piecetype[32], blacktype[32];\r
 109 char selectedFairy[80];\r
 110 char *inifile = INI_FILE;\r
 111 \r
 112 int Ticks, tlim, Setup, SetupQ;\r
 113 \r
 114 int GameHistory[1024];\r
 115 char HistoryBoards[1024][STATE], setupPosition[162];\r
 116 int GamePtr, HistPtr;\r
 117 \r
 118 #define W while\r
 119 #define K(A,B) *(int*)(T+A+S*(B&31))\r
 120 #define J(A) K(y+A,b[y])-K(x+A,u)-K(H+A,t)\r
 121 \r
 122 int U=(1<<23)-1;\r
 123 struct _ {int K,V;char X,Y,D,F;} *A;           /* hash table, 16M+8 entries*/\r
 124 \r
 125 int M=136,S=128,I=8e3,Q,O,K,N,j,R,J,Z,LL,GT,   /* M=0x88                   */\r
 126 BW,BH,sh,\r
 127 w[16]={0,2,2,-1,7,8,12,23,7,5},                /* relative piece values    */\r
 128 o[256],\r
 129 oo[32],                                        /* initial piece setup      */\r
 130 of[256],\r
 131 od[16];                                        /* 1st dir. in o[] per piece*/\r
 132 \r
 133 signed char L,pl[32],pb[32],\r
 134 b[513],                                        /* board: 16x8+dummy, + PST */\r
 135 T[4104],                                       /* hash translation table   */\r
 136 centr[32],\r
 137 n[]=".*XKNBRQEWFMACHG?x+knbrqewfmachg";        /* piece symbols on printout*/\r
 138 \r
 139 int pv[10000],*sp=pv; // triangular array\r
 140 int margin;\r
 141 \r
 142 void pboard()\r
 143 {int i;\r
 144  i=-1;W(++i<128)printf(" %c",(i&15)==BW&&(i+=15-BW)?10:n[b[i]&31]);\r
 145 }\r
 146          \r
 147 \r
 148 D(k,q,l,e,E,z,n)        /* recursive minimax search, k=moving side, n=depth*/\r
 149 int k,q,l,e,E,z,n;      /* (q,l)=window, e=current eval. score, E=e.p. sqr.*/\r
 150 {                       /* e=score, z=prev.dest; J,Z=hashkeys; return score*/\r
 151  int j,r,m,v,d,h,i,F,G,P,V,f=J,g=Z,C,s,flag,FF,*ps=sp,kk=S;\r
 152  signed char t,p,u,x,y,X,Y,H,B,gt;\r
 153  struct _*a=A+(J+(k+S)*E&U);                   /* lookup pos. in hash table*/\r
 154  *sp++=0;\r
 155  q-=q<e;l-=l<=e;                               /* adj. window: delay bonus */\r
 156  d=a->D;m=a->V;X=a->F;Y=a->Y;                  /* resume at stored depth   */\r
 157  if(a->K-Z|z&S  |                              /* miss: other pos. or empty*/\r
 158   !(m<=q|X&8&&m>=l|X&S))                       /*   or window incompatible */\r
 159   d=Y=0;                                       /* start iter. from scratch */\r
 160  X=a->X;                                       /* start at best-move hint  */\r
 161  W(d++<n||d<3||              /*** min depth = 2   iterative deepening loop */\r
 162    z&S&&K==I&&(GetTickCount()-Ticks<tlim&d<=MaxDepth|| /* root: deepen upto time   */\r
 163    (K=X,L=Y&~S,Score=m,d=3)))                  /* time's up: go do best    */\r
 164  {x=B=X;                                       /* start scan at prev. best */\r
 165   h=Y&S;                                       /* request try noncastl. 1st*/\r
 166   P=d>2&&l+I?D(16-k,-l,1-l,-e,2*S,2*S,d-3):I;  /* search null move         */\r
 167   m=-P<l|R<5?d-2?-I:e:-P;   /*** prune if > beta  unconsidered:static eval */\r
 168   SHAMAX( if(pl[k]<=1&pl[16-k]>1)m=I-1; )      /* bare king loses          */\r
 169   N++;                                         /* node count (for timing)  */\r
 170   do{u=b[x];                                   /* scan board looking for   */\r
 171    if(u&&(u&16)==k)                            /*  own piece (inefficient!)*/\r
 172    {r=p=u&15;                                  /* p = piece type (set r>0) */\r
 173     j=od[p];                                   /* first step vector f.piece*/\r
 174     W(r=o[++j])                                /* loop over directions o[] */\r
 175     {A:                                        /* resume normal after best */\r
 176      flag=h?3:of[j];                           /* move modes (for fairies) */\r
 177      y=x;F=FF=G=S;                             /* (x,y)=move, (F,G)=castl.R*/\r
 178      do{                                       /* y traverses ray, or:     */\r
 179       H=y=h?Y^h:y+r;                           /* sneak in prev. best move */\r
 180       if(flag&1<<8)H=y=(y&15)>13?y+BW:(y&15)>=BW?y-BW:y; /* cylinder board */\r
 181       if(y&S|(y&15)>=BW)break;                 /* board edge hit           */\r
 182 #ifdef MULTIPATH\r
 183       if(flag&1<<9)                            /* if multipath move        */\r
 184       {t=flag>>12;                             /* get dir. stepped twice   */\r
 185        if(b[x+t]){if(b[y-2*t]|b[y-t])break;}else \r
 186        if(b[x+2*t]&&b[y-t])break;              /* test if empty path exists*/\r
 187       }\r
 188 #endif\r
 189       m=E<16|(E^112)<16&&flag&1&y-E<2&E-y<2?I:m;      /* bad castling  */\r
 190       if(p<3&y==E&flag)H=z&127;                /* shift capt.sqr. H if e.p.*/\r
 191       t=b[H];\r
 192       if(flag&1+!t)                            /* mode (capt/nonc) allowed?*/\r
 193       {if(t&&(t&16)==k)break;                  /* capture own              */\r
 194        i=w[t&15]+((t&192)>>sh);                /* value of capt. piece t   */\r
 195        if(i<0&&(pl[t&31]<2||                   /* K capture, (of last K),  */\r
 196         t>>3&kk!=H&kk!=S||(kk=H,i=-i,0)))m=I,d=98;/* or duple check: cutoff*/\r
 197        if(m>=l&d>1)goto C;                     /* abort on fail high       */\r
 198        v=d-1?e:i-p;                            /*** MVV/LVA scoring if d=1**/\r
 199        if(d-!t>1)                              /*** all captures if d=2  ***/\r
 200        {v=gt=0;G:                              /* retry move with gating   */\r
 201         v+=centr[p]?b[x+257]-b[y+257]:0;       /* center positional pts.   */\r
 202         if(!(G&S))b[FF]=b[G],v+=50;            /* castling: put R & score  */\r
 203         b[G]=b[H]=0;b[x]=gt;b[y]=u|32;         /* do move, set non-virgin  */\r
 204         i+=-((pl[t&31]-=!!t)&1)&pb[t&31];/* update piece count, pair bonus */\r
 205         v-=w[p]>0|R<EG?0:20;                   /*** freeze K in mid-game ***/\r
 206         if(p<3)                                /* pawns:                   */\r
 207         {v-=9*((x-2&M||b[x-2]-u)+              /* structure, undefended    */\r
 208                (x+2&M||b[x+2]-u)               /*        squares plus bias */\r
 209               +(w[b[x^16]&15]<0))              /*** cling to magnetic K ***/\r
 210               +(R-76>>2);                      /* end-game Pawn-push bonus */\r
 211          b[y]+=V=y+r+1&S?647-p|pm:2*(u&y+16&32);/*upgrade P or convert to Q*/\r
 212          if(V&makruk)b[y]=u|7,V=480;           /* Makruk promotion on 6th  */\r
 213          V>>=sh;                               /* for Shatranj promo to F  */\r
 214          i+=V;                                 /* promotion / passer bonus */\r
 215         } if(z&S && GamePtr<6) v+=(rand()>>10&31)-16;\r
 216         J+=J(0);Z+=J(4)+G-S;\r
 217         pl[k]-=!!t;                            /* count pieces per side    */\r
 218         v+=e+i;V=m>q?m:q;                      /*** new eval & alpha    ****/\r
 219         if(z&S)V=m-margin>q?m-margin:q;        /* multiPV                  */\r
 220         C=d-1-(d>5&p>2&!t&!h);                 /* nw depth, reduce non-cpt.*/\r
 221         C=R<EG|P-I|d<3||t&&p-3?C:d;            /* extend 1 ply if in-check */\r
 222         do\r
 223          s=C>2|v>V?-D(16-k,-l,-V,-v,/*** futility, recursive eval. of reply */\r
 224                                      F,y&255,C):v;\r
 225         W(s>q&++C<d); v=s;                     /* no fail:re-srch unreduced*/\r
 226         if(v>V&v<l){int *p=sp;\r
 227          sp=ps+1;\r
 228          W(*sp++=*p++);\r
 229          *ps=256*x+y;\r
 230         }\r
 231         if(z&S&&K-I)                           /* move pending: check legal*/\r
 232         {if(v+I&&x==K&y==L&gt==GT)             /*   if move found          */\r
 233          {Q=-e-i;O=F;LL=L;prom=gt;\r
 234           if(b[y]-u&15)prom=b[y]-=PromPiece,   /* under-promotion, correct */\r
 235            pl[u&31]--,pl[prom&31]++,Z+=PromPiece;/*piece & invalidate hash */\r
 236           a->D=99;a->V=0;                      /* lock game in hash as draw*/\r
 237           R-=i/FAC;                            /*** total captd material ***/\r
 238           Fifty = t|p<3?0:Fifty+1;\r
 239           sp=ps;\r
 240                      return l;}                /*   & not in check, signal */\r
 241          v=m;                                  /* (prevent fail-lows on    */\r
 242         }                                      /*   K-capt. replies)       */\r
 243         pl[k]+=!!t;pl[t&31]+=!!t;\r
 244         b[G]=b[FF];b[FF]=b[y]=0;b[x]=u;b[H]=t; /* undo move,G can be dummy */\r
 245        }                                       /*          if non-castling */\r
 246        if(z&S&&K==I&d>2&v>V&v<l){int *p=ps;char X,Y;\r
 247         if(Post){\r
 248          printf("%2d ",d-2);\r
 249          printf("%6d ",v);\r
 250          printf("%8d %10d",(GetTickCount()-Ticks)/10,N);\r
 251          while(*p){X=*p>>8;Y=*p++;\r
 252          printf(" %c%c%c%c",'a'+(X&15),'8'-(X>>4),'a'+(Y&15),'8'-(Y>>4&7));}\r
 253          printf("\n");fflush(stdout);\r
 254         }GT=gt;                                /* In root, remember gated  */\r
 255        }\r
 256        if(v>m)                                 /* new best, update max,best*/\r
 257         m=v,X=x,Y=y|S&F;                       /* mark non-double with S   */\r
 258        if(gating&&!(u&32)&&p>2&&d-!t>1){       /* virgin non-Pawn: gate    */\r
 259         pl[(gt|=k+40)-27]++;                   /* prev. gated back in hand */\r
 260         if(m>=l)goto C;                        /* loop skips cutoff :-(    */\r
 261         W(++gt<k+43)if(pl[gt-27]){             /* look if more to gate     */\r
 262          pl[gt-27]--;v=10;goto G;              /* remove from hand & retry */\r
 263        }}\r
 264        J=f;Z=g;\r
 265        if(h){h=0;goto A;}                      /* redo after doing old best*/\r
 266       }\r
 267       s=t;v=r^flag>>12;                        /* calc. alternated vector  */\r
 268       if(flag&15^4|u&32||                      /* no double or moved before*/\r
 269          p>2&!(flag&S)&&                       /* no P & no virgin jump,   */\r
 270          ((b[G=r<0?x&~15:BW-1|x&112]^32)<33    /* no virgin R in corner G, */\r
 271          ||b[G^1]|b[G^2]|b[FF=y+v-r])          /* no 2 empty sq. next to R */\r
 272         )t+=flag&4;                            /* fake capt. for nonsliding*/\r
 273       else if(flag&64)t=flag&128?0:t,flag&=63;else F=y; /* enable e.p.     */\r
 274       if(s&&flag&8)t=0,flag^=flag>>4&15;       /* hoppers go to next phase */\r
 275       if(!(flag&S))                            /* zig-zag piece?           */\r
 276        r=v,flag^=flag>>4&15;                   /* alternate vector & mode  */\r
 277      }W(!t);                                   /* if not capt. continue ray*/\r
 278    }}\r
 279    if((++x&15)>=BW)x=x+16&112;                 /* next sqr. of board, wrap */\r
 280   }W(x-B);           \r
 281 C:FMAX( m=m+I|P==I?m:(X=Y=0); )                /* if stalemate, draw-score */\r
 282   if(a->D<99)                                  /* protect game history     */\r
 283    a->K=Z,a->V=m,a->D=d,a->X=X,                /* always store in hash tab */\r
 284    a->F=8*(m>q)|S*(m<l),a->Y=Y;                /* move, type (bound/exact),*/\r
 285   }                                            /*    encoded in X S,8 bits */\r
 286 if(z&4*S)K=X,L=Y&~S;\r
 287  sp=ps;\r
 288  return m+=m<e;                                /* delayed-loss bonus       */\r
 289 }\r
 290 \r
 291 \r
 292 /* Generic main() for Winboard-compatible engine     */\r
 293 /* (Inspired by TSCP)                                */\r
 294 /* Author: H.G. Muller                               */\r
 295 \r
 296 /* The engine is invoked through the following       */\r
 297 /* subroutines, that can draw on the global vaiables */\r
 298 /* that are maintained by the interface:             */\r
 299 /* Side         side to move                         */\r
 300 /* Move         move input to or output from engine  */\r
 301 /* PromPiece    requested piece on promotion move    */\r
 302 /* TimeLeft     ms left to next time control         */\r
 303 /* MovesLeft    nr of moves to play within TimeLeft  */\r
 304 /* MaxDepth     search-depth limit in ply            */\r
 305 /* Post         boolean to invite engine babble      */\r
 306 \r
 307 /* InitEngine() progran start-up initialization      */\r
 308 /* InitGame()   initialization to start new game     */\r
 309 /*              (sets Side, but not time control)    */\r
 310 /* Think()      think up move from current position  */\r
 311 /*              (leaves move in Move, can be invalid */\r
 312 /*               if position is check- or stalemate) */\r
 313 /* DoMove()     perform the move in Move             */\r
 314 /*              (togglese Side)                      */\r
 315 /* ReadMove()   convert input move to engine format  */\r
 316 /* PrintMove()  print Move on standard output        */\r
 317 /* Legal()      check Move for legality              */\r
 318 /* ClearBoard() make board empty                     */\r
 319 /* PutPiece()   put a piece on the board             */\r
 320 \r
 321 /* define this to the codes used in your engine,     */\r
 322 /* if the engine hasn't defined it already.          */\r
 323 \r
 324 int PrintResult(int s)\r
 325 {\r
 326         int j, k, cnt=0;\r
 327 \r
 328         /* search last 50 states with this stm for third repeat */\r
 329         for(j=2; j<=100 && j <= HistPtr; j+=2)\r
 330         {\r
 331             for(k=0; k<STATE; k++)\r
 332                 if(HistoryBoards[HistPtr][k] !=\r
 333                    HistoryBoards[HistPtr-j&1023][k] )\r
 334                    {\r
 335                      goto differs;}\r
 336             /* is the same, count it */\r
 337             if(++cnt > 1) /* third repeat */\r
 338             {\r
 339                 printf("1/2-1/2 {Draw by repetition}\n");\r
 340                 return 1;\r
 341             }\r
 342           differs: ;\r
 343         }\r
 344         K=I;\r
 345         cnt = D(s,-I,I,Q,O,LL|4*S,3);\r
 346 #ifdef SHATRANJ\r
 347         if(pl[s]==1 && pl[16-s]==1) {\r
 348                 printf("1/2-1/2 {Insufficient mating material}\n");\r
 349                 return 4;\r
 350         }\r
 351         if(pl[s]<=1 && pl[16-s]>1) {\r
 352                 if (s == BLACK)\r
 353                         printf("0-1 {Bare King}\n");\r
 354                 else\r
 355                         printf("1-0 {Bare King}\n");\r
 356                 return 5;\r
 357         }\r
 358 #else\r
 359         if(cnt>-I+1 && K==0 && L==0) {\r
 360                 printf("1/2-1/2 {Stalemate}\n");\r
 361                 return 2;\r
 362         }\r
 363 #endif\r
 364         if(cnt==-I+1) {\r
 365                 if (s == WHITE)\r
 366                         printf("0-1 {Black mates}\n");\r
 367                 else {\r
 368                         if(succession) { // suppress loss claim if black might be able to replace its King by promotion\r
 369                             for(j=0;j<BW;j++)if((b[j+96]&31)==18)return 0;\r
 370                         }\r
 371                         printf("1-0 {White mates}\n");\r
 372                 }\r
 373                 return 3;\r
 374         }\r
 375         if(Fifty >=100) {\r
 376                 printf("1/2-1/2 {Draw by fifty move rule}\n");\r
 377                 return 4;\r
 378         }\r
 379         return 0;\r
 380 }\r
 381 \r
 382 \r
 383 void InitEngine()\r
 384 {\r
 385  N=32*S+7;W(N-->S+3)T[N]=rand()>>9;\r
 386  srand(GetTickCount());\r
 387 }\r
 388 \r
 389 void InitGame()\r
 390 {\r
 391  int i,k=0;\r
 392 \r
 393  Side = WHITE; Q=0; O=S;\r
 394  Fifty = 0; R = 0;\r
 395  for(i=0;i<16*BH;i++)b[i]=0;\r
 396  for(i=0;i<32;i++)pl[i]=0;\r
 397  K=BW;W(K--)\r
 398  {b[K]=oo[K+16]+16;b[K+112]=oo[K];b[K+16+16*!!makruk]=18;b[K+96-16*!!makruk]=1; /* initial board setup*/\r
 399   pl[oo[K+16]+16]++;pl[oo[K]]++;pl[18]++;pl[1]++;\r
 400   if(w[oo[K+16]+16] == -1)pl[oo[K+16]+16]=1;\r
 401   if(w[oo[K]] == -1)pl[oo[K]]=1;\r
 402   L=8;W(L--)b[16*L+K+257]=(K-BW/2)*(K-BW/2)+(L-3.5)*(L-3.5); /* center-pts table   */\r
 403  }                                                   /*(in unused half b[])*/\r
 404  for(i=0; i<BW; i++) {\r
 405   R += abs(w[oo[i]])/FAC + abs(w[oo[i+16]])/FAC;\r
 406   Q += abs(w[oo[i]]) - abs(w[oo[i+16]]) + w[1] - w[2];\r
 407   Q += (pl[i]>>1)*pb[i] -(pl[i+16]>>1)*pb[i];\r
 408   if(w[oo[i]] < 0) k = w[oo[i]];\r
 409  }\r
 410  R -= 2*(-k/FAC);\r
 411  pl[WHITE] = pl[BLACK] = 2*BW; \r
 412  pm = !pl[BLACK+7] && pl[BLACK+9] && pl[WHITE+7] ? 2 : 0; // Unlike white, black has no 'Q', so promote to 9, which he does have.\r
 413  if(gating) pl[14] = pl[15] = pl[30] = pl[31] = 1, R += 2*(w[9]/FAC + w[10]/FAC);\r
 414 }\r
 415 \r
 416 void CopyBoard(int s)\r
 417 {\r
 418         int i, j;\r
 419 \r
 420         /* copy game representation of engine to HistoryBoard */\r
 421         /* don't forget castling rights and e.p. state!       */\r
 422         for(i=0; i<BH; i++)\r
 423         for(j=0; j<BW; j++)                 /* board squares  */\r
 424             HistoryBoards[s][BW*i+j] = b[16*i+j]|64*(16*i+j==O);\r
 425 }\r
 426                                          \r
 427 void PrintVariants(int combo)\r
 428 {\r
 429         int count=0, total=0; char c=EOF+1, buf[80];\r
 430         FILE *f;\r
 431 \r
 432         f = fopen(INI_FILE, "r");\r
 433         if(f==NULL) return;\r
 434 \r
 435         /* search for game names in definition file */\r
 436         do {\r
 437            while(fscanf(f, "Game: %s", buf) != 1 && c != EOF) \r
 438                while((c = fgetc(f)) != EOF && c != '\n');\r
 439            if(c == EOF) break;\r
 440            total++;\r
 441            if(combo == (strstr(buf, "fairy/") != buf)) continue;\r
 442            if(combo && count == 0) strcpy(selectedFairy, buf);\r
 443            if(count++) printf(combo ? " /// " : ",");\r
 444            printf("%s", combo ? buf+6 : buf);\r
 445         } while(c != EOF);\r
 446 \r
 447         fclose(f);\r
 448         if(!combo && total != count) printf("%sfairy", count ? "," : "");\r
 449 }\r
 450 \r
 451 void PrintOptions()\r
 452 {\r
 453         printf("feature option=\"Resign -check %d\"\n", Resign);\r
 454         printf("feature option=\"Resign Threshold -spin %d 200 1200\"\n", Threshold);\r
 455         printf("feature option=\"Ini File -file %s\"\n", inifile);\r
 456         printf("feature option=\"Multi-PV Margin -spin %d 0 1000\"\n", margin);\r
 457         printf("feature option=\"Variant fairy selects -combo "); PrintVariants(1); printf("\"\n");\r
 458         printf("feature option=\"Cambodian Makruk rules -check %d\"\n", Cambodian);\r
 459         printf("feature option=\"Dummy Slider Example -slider 20 0 100\"\n");\r
 460         printf("feature option=\"Dummy String Example -string happy birthday!\"\n");\r
 461         printf("feature option=\"Dummy Path Example -path .\"\n");\r
 462         printf("feature option=\"Clear Hash -button\"\n");\r
 463         printf("feature done=1\n");\r
 464 }\r
 465                                          \r
 466 void LoadGame(char *name)\r
 467 {\r
 468         int i, j, ptc, count=0; char c, buf[80], pieceToChar[80];\r
 469         static int currentVariant;\r
 470         FILE *f;\r
 471 \r
 472         f = fopen(inifile, "r");\r
 473         if(f==NULL)\r
 474         {   printf("telluser piece-description file '%s'  not found\n", inifile);\r
 475             exit(0);\r
 476         }\r
 477         if(fscanf(f, "version 4.8(%c)", &c)!=1 || c != 'w')\r
 478         { printf("telluser incompatible fmax.ini file\n"); exit(0); }\r
 479 \r
 480         gating = succession = 0;\r
 481         if(name != NULL)\r
 482         {  /* search for game name in definition file */\r
 483            if(!strcmp(name, "makruk") && Cambodian) name = "cambodian"; else\r
 484            if(!strcmp(name, "fairy")) name = selectedFairy;\r
 485            gating = !strcmp(name, "seirawan");\r
 486            while((ptc=fscanf(f, "Game: %s # %s", buf, pieceToChar))==0 || strcmp(name, buf) ) {\r
 487                while((c = fgetc(f)) != EOF && c != '\n');\r
 488                count++;\r
 489                if(c == EOF) {\r
 490                    printf("telluser variant %s not supported\n", name);\r
 491                    fclose(f);\r
 492                    return; /* keep old settings */\r
 493                }\r
 494            }\r
 495            currentVariant = count;\r
 496         }\r
 497 \r
 498         /* We have found variant, or if none specified, are at beginning of file */\r
 499         if(fscanf(f, "%dx%d", &BW, &BH)!=2 || BW>12 || BH!=8)\r
 500         { printf("telluser unsupported board size %dx%d\n",BW,BH); exit(0); }\r
 501 \r
 502         for(i=0; i<BW; i++) fscanf(f, "%d", oo+i);\r
 503         for(i=0; i<BW; i++) fscanf(f, "%d", oo+i+16);\r
 504         for(i= 0; i<=U; i++)\r
 505             A[i].K = A[i].D = A[i].X = A[i].Y = A[i].F = 0; /* clear hash */\r
 506         for(i=0; i<32; i++) piecetype[i] = blacktype[i] = 0;\r
 507 \r
 508         i=0; j=-1; c=0;\r
 509         while(fscanf(f, "%d,%x", o+j, of+j)==2 ||\r
 510                                       fscanf(f,"%c:%d",&c, w+i+1)==2)\r
 511         {   if(c)\r
 512             { od[++i]=j; centr[i] = c>='a';\r
 513               blacktype[c&31]=i; piecename[i]=c&31;\r
 514               if(piecetype[c&31]==0) piecetype[c&31]=i; // only first\r
 515               pb[i] = pb[i+16] = w[i]>>3 & ~3; // pair bonus, for now 1/8 of piece value, leave low bits for flag\r
 516               succession |= w[i] < -4;         // expendable royalty; assume we can promote to it\r
 517             } else {\r
 518               if((o[j]^o[j]+8>>4)&1 || of[j]>>4) pb[i] = pb[i+16] = 0; // not color bound (or too complex to see it), so no pair bonus\r
 519               if(!o[j]) pb[i] = pb[i+16] = of[j--]; // hand-set pair bonus kludges: 3 for mating minor, negative for non-mating pair.\r
 520             }\r
 521             j++; o[j]=0;\r
 522             /* printf("# c='%c' i=%d od[i]=%d j=%d (%3d,%8x)\n",c?c:' ',i,od[i],j,o[j-1],of[j-1]); /**/\r
 523             c=0; if(i>15 || j>255) break;\r
 524         }\r
 525 \r
 526         fclose(f);\r
 527         sh = w[7] < 250 ? 3 : 0;\r
 528         makruk = w[7]==181 ? 64 : 0; // w[7] is used as kludge to enable makruk promotions\r
 529         if(name == selectedFairy) {\r
 530             printf(ptc == 1 ? "setup " : "setup (%s) ", pieceToChar); // setup board in GUI\r
 531             for(i=0; i<BW; i++) printf("%c", piecename[oo[i+16]]+'`'); printf("/");\r
 532             for(i=0; i<BW; i++) printf("%c", piecename[2]+'`'); printf("/");\r
 533             for(i=2; i<BH-2; i++) printf("%d/", BW);\r
 534             for(i=0; i<BW; i++) printf("%c", piecename[1]+'@'); printf("/");\r
 535             for(i=0; i<BW; i++) printf("%c", piecename[oo[i]]+'@'); printf(" w KQkq - 0 1\n");\r
 536         }\r
 537 }\r
 538 \r
 539 int main(int argc, char **argv)\r
 540 {\r
 541         int Computer, MaxTime, MaxMoves, TimeInc, sec, i;\r
 542         char line[256], command[256], c;\r
 543         int m, nr;\r
 544         double cpuT;\r
 545 \r
 546         if(argc>1 && sscanf(argv[1], "%d", &m)==1)\r
 547         { U = (1<<m)-1; argc--; argv++; }\r
 548         A = (struct _ *) calloc(U+1, sizeof(struct _));\r
 549         if(argc>1) inifile = argv[1];\r
 550 \r
 551         signal(SIGINT, SIG_IGN);\r
 552         printf("tellics say     " NAME " " VERSION "\n");\r
 553         printf("tellics say     by H.G. Muller\n");\r
 554         printf("tellics say Gothic Chess is protected by U.S. patent #6,481,716 by Ed Trice.\n");\r
 555         printf("tellics say Falcon Chess is protected by U.S. patent #5,690,334 by George W. Duke\n");\r
 556         InitEngine();\r
 557         LoadGame(NULL);\r
 558         InitGame();\r
 559         Computer = EMPTY;\r
 560         MaxTime  = 10000;  /* 10 sec */\r
 561         MaxDepth = 30;     /* maximum depth of your search */\r
 562 \r
 563         for (;;) {\r
 564                 fflush(stdout);\r
 565                 if (Side == Computer) {\r
 566                         /* think up & do move, measure time used  */\r
 567                         /* it is the responsibility of the engine */\r
 568                         /* to control its search time based on    */\r
 569                         /* MovesLeft, TimeLeft, MaxMoves, TimeInc */\r
 570                         /* Next 'MovesLeft' moves have to be done */\r
 571                         /* within TimeLeft+(MovesLeft-1)*TimeInc  */\r
 572                         /* If MovesLeft<0 all remaining moves of  */\r
 573                         /* the game have to be done in this time. */\r
 574                         /* If MaxMoves=1 any leftover time is lost*/\r
 575                         Ticks = GetTickCount();\r
 576                         cpuT = CPUtime(); printf("# times @ %u\n", Ticks);\r
 577                         m = MovesLeft<=0 ? 40 : MovesLeft;\r
 578                         tlim = (0.6-0.06*(BW-8))*(TimeLeft+(m-1)*TimeInc)/(m+7);\r
 579                         if(tlim>TimeLeft/15) tlim = TimeLeft/15;\r
 580                         PromPiece = 0; /* Always promote to Queen ourselves */\r
 581                         N=0;K=I;\r
 582                         if (D(Side,-I,I,Q,O,LL|S,3)==I) {\r
 583                             Side ^= BLACK^WHITE;\r
 584                             m = GetTickCount() - Ticks;\r
 585                             printf("# times @ %u: real=%d cpu=%1.0f\n", m + Ticks, m,\r
 586                                       (CPUtime() - cpuT)/CLOCKS_PER_SEC);\r
 587                             printf("move ");\r
 588                             printf("%c%c%c%c",'a'+(K&15),'0'+BH-(K>>4),\r
 589                                           'a'+(L&15),'0'+BH-(L>>4));\r
 590                             if(prom)printf("%c",piecename[prom&15]+'a'-1);\r
 591                             printf("\n");\r
 592 \r
 593                             /* time-control accounting */\r
 594                             TimeLeft -= m;\r
 595                             TimeLeft += TimeInc;\r
 596                             if(--MovesLeft == 0) {\r
 597                                 MovesLeft = MaxMoves;\r
 598                                 if(MaxMoves == 1)\r
 599                                      TimeLeft  = MaxTime;\r
 600                                 else TimeLeft += MaxTime;\r
 601                             }\r
 602 \r
 603                             GameHistory[GamePtr++] = PACK_MOVE;\r
 604                             CopyBoard(HistPtr=HistPtr+1&1023);\r
 605                             if(Resign && Score <= -Threshold) { \r
 606                                 printf("resign\n"); Computer=EMPTY;\r
 607                             } else if(PrintResult(Side))\r
 608                                 Computer = EMPTY;\r
 609                         } else {\r
 610                             if(!PrintResult(Side))\r
 611                                 printf("resign { refuses own move }\n");\r
 612                             Computer = EMPTY;\r
 613                         }\r
 614                         continue;\r
 615                 }\r
 616                 if (!fgets(line, 256, stdin))\r
 617                         return 1;\r
 618                 if (line[0] == '\n')\r
 619                         continue;\r
 620                 sscanf(line, "%s", command);\r
 621                 if (!strcmp(command, "xboard"))\r
 622                         continue;\r
 623                 if (!strcmp(command, "protover")) {\r
 624                         printf("feature myname=\"" NAME " " VERSION "\"\n");\r
 625                         printf("feature memory=1\n");\r
 626                         printf("feature setboard=0 xedit=1 ping=1 done=0\n");\r
 627                         printf("feature variants=\"");\r
 628                         PrintVariants(0);\r
 629                         printf("\"\n");\r
 630                         PrintOptions();\r
 631                         continue;\r
 632                 }\r
 633                 if (!strcmp(command, "ping")) { int nr=0;\r
 634                         sscanf(line, "ping %d", &nr);\r
 635                         printf("pong %d\n", nr);\r
 636                         continue;\r
 637                 }\r
 638                 if (!strcmp(command, "p")) {\r
 639                         pboard();\r
 640                         continue;\r
 641                 }\r
 642                 if (!strcmp(command, "memory")) {\r
 643                         int mem, mask;\r
 644                         sscanf(line+6, "%d", &mem); mem = (mem*1024*1024)/12; // max nr of hash entries\r
 645                         mask = 0x7FFFFFFF; while(mask > mem) mask >>= 1;\r
 646                         if(mask != U) {\r
 647                             free(A); U = mask;\r
 648                             A = (struct _ *) calloc(U+1, sizeof(struct _));\r
 649                         }\r
 650                         continue;\r
 651                 }\r
 652                 if (!strcmp(command, "new")) {\r
 653                         /* start new game */\r
 654                         LoadGame("normal");\r
 655                         InitGame();\r
 656                         GamePtr   = Setup = 0;\r
 657                         GameNr++;\r
 658                         HistPtr   = 0;\r
 659                         Computer  = BLACK;\r
 660                         TimeLeft  = MaxTime;\r
 661                         MovesLeft = MaxMoves;\r
 662                         for(nr=0; nr<1024; nr++)\r
 663                             for(m=0; m<STATE; m++)\r
 664                                 HistoryBoards[nr][m] = 0;\r
 665                         continue;\r
 666                 }\r
 667                 if (!strcmp(command, "quit"))\r
 668                         /* exit engine */\r
 669                         return 0;\r
 670                 if (!strcmp(command, "force")) {\r
 671                         /* computer plays neither */\r
 672                         Computer = EMPTY;\r
 673                         continue;\r
 674                 }\r
 675                 if (!strcmp(command, "white")) {\r
 676                         /* set white to move in current position */\r
 677                         if(Side == BLACK) Q = -Q;\r
 678                         Side     = WHITE;\r
 679                         Computer = BLACK;\r
 680                         continue;\r
 681                 }\r
 682                 if (!strcmp(command, "black")) {\r
 683                         /* set blck to move in current position */\r
 684                         if(Side == WHITE) Q = -Q;\r
 685                         Side     = BLACK;\r
 686                         Computer = WHITE;\r
 687                         continue;\r
 688                 }\r
 689                 if (!strcmp(command, "st")) {\r
 690                         /* move-on-the-bell mode     */\r
 691                         /* indicated by MaxMoves = 1 */\r
 692                         sscanf(line, "st %d", &MaxTime);\r
 693                         MovesLeft = MaxMoves = 1;\r
 694                         TimeLeft  = MaxTime *= 1000;\r
 695                         TimeInc   = 0;\r
 696                         continue;\r
 697                 }\r
 698                 if (!strcmp(command, "sd")) {\r
 699                         /* set depth limit (remains in force */\r
 700                         /* until next 'sd n' command)        */\r
 701                         sscanf(line, "sd %d", &MaxDepth);\r
 702                         MaxDepth += 2; /* QS depth */\r
 703                         continue;\r
 704                 }\r
 705                 if (!strcmp(command, "level")) {\r
 706                         /* normal or blitz time control */\r
 707                         sec = 0;\r
 708                         if(sscanf(line, "level %d %d %d",\r
 709                                  &MaxMoves, &MaxTime, &TimeInc)!=3 &&\r
 710                            sscanf(line, "level %d %d:%d %d",\r
 711                                  &MaxMoves, &MaxTime, &sec, &TimeInc)!=4)\r
 712                              continue;\r
 713                         MovesLeft = MaxMoves;\r
 714                         TimeLeft  = MaxTime = 60000*MaxTime + 1000*sec;\r
 715                         TimeInc  *= 1000;\r
 716                         continue;\r
 717                 }\r
 718                 if (!strcmp(command, "time")) {\r
 719                         /* set time left on clock */\r
 720                         sscanf(line, "time %d", &TimeLeft);\r
 721                         TimeLeft  *= 10; /* centi-sec to ms */\r
 722                         continue;\r
 723                 }\r
 724                 if (!strcmp(command, "otim")) {\r
 725                         /* opponent's time (not kept, so ignore) */\r
 726                         continue;\r
 727                 }\r
 728                 if (!strcmp(command, "easy")) {\r
 729                         continue;\r
 730                 }\r
 731                 if (!strcmp(command, "hard")) {\r
 732                         continue;\r
 733                 }\r
 734                 if (!strcmp(command, "accepted")) {\r
 735                         continue;\r
 736                 }\r
 737                 if (!strcmp(command, "rejected")) {\r
 738                         continue;\r
 739                 }\r
 740                 if (!strcmp(command, "random")) {\r
 741                         continue;\r
 742                 }\r
 743                 if (!strcmp(command, "option")) {\r
 744                         int i; static char filename[80];\r
 745                         if(sscanf(line+7, "Resign=%d", &Resign) == 1) continue;\r
 746                         if(sscanf(line+7, "Resign Threshold=%d", &Threshold) == 1) continue;\r
 747                         if(sscanf(line+7, "Ini File=%s", filename) == 1) {\r
 748                                 inifile = filename; continue;\r
 749                         }\r
 750                         if(sscanf(line+7, "Clear Hash%c", &c) == 1) for(i=0; i<=U; i++) A->K = 0;\r
 751                         if(sscanf(line+7, "MultiVariation Margin=%d", &margin) == 1) continue;\r
 752                         if(sscanf(line+7, "Variant fairy selects=%s", selectedFairy+6) == 1) continue;\r
 753                         if(sscanf(line+7, "Cambodian Makruk rules=%d", &Cambodian) == 1) continue;\r
 754                         continue;\r
 755                 }\r
 756                 if (!strcmp(command, "go")) {\r
 757                         /* set computer to play current side to move */\r
 758                         Computer = Side;\r
 759                         MovesLeft = -(GamePtr+(Side==WHITE)>>1);\r
 760                         while(MaxMoves>0 && MovesLeft<=0)\r
 761                             MovesLeft += MaxMoves;\r
 762                         continue;\r
 763                 }\r
 764                 if (!strcmp(command, "hint")) {\r
 765                         Ticks = GetTickCount(); tlim = 1000;\r
 766                         D(Side,-I,I,Q,O,LL|4*S,6);\r
 767                         if (K==0 && L==0)\r
 768                                 continue;\r
 769                         printf("Hint: ");\r
 770                         printf("%c%c%c%c",'a'+(K&7),'8'-(K>>4),\r
 771                                           'a'+(L&7),'8'-(L>>4));\r
 772                         printf("\n");\r
 773                         continue;\r
 774                 }\r
 775                 if (!strcmp(command, "undo")   && (nr=1) ||\r
 776                     !strcmp(command, "remove") && (nr=2)   ) {\r
 777                         /* 'take back' moves by replaying game */\r
 778                         /* from history until desired ply      */\r
 779                         if (GamePtr - nr < 0)\r
 780                                 continue;\r
 781                         GamePtr -= nr;\r
 782                         HistPtr -= nr;   /* erase history boards */\r
 783                         while(nr-- > 0)  \r
 784                             for(m=0; m<STATE; m++)\r
 785                                 HistoryBoards[HistPtr+nr+1&1023][m] = 0;\r
 786                         InitGame();\r
 787                         if(Setup) {\r
 788                             for(i=0; i<128; i++) b[i] = setupPosition[i];\r
 789                             for(i=0; i<32; i++) pl[i] = setupPosition[i+130];\r
 790                             Side = setupPosition[128]; Q = SetupQ;\r
 791                             R = setupPosition[129];\r
 792                         }\r
 793                         for(i=0; i<=U; i++) A[i].D = A[i].K = 0; // clear hash table\r
 794                         for(nr=0; nr<GamePtr; nr++) {\r
 795                             UNPACK_MOVE(GameHistory[nr]);\r
 796                             D(Side,-I,I,Q,O,LL|S,3);\r
 797                             Side ^= BLACK^WHITE;\r
 798                         }\r
 799                         continue;\r
 800                 }\r
 801                 if (!strcmp(command, "post")) {\r
 802                         Post = 1;\r
 803                         continue;\r
 804                 }\r
 805                 if (!strcmp(command, "nopost")) {\r
 806                         Post = 0;\r
 807                         continue;\r
 808                 }\r
 809                 if (!strcmp(command, "variant")) {\r
 810                         sscanf(line, "variant %s", command);\r
 811                         LoadGame(command);\r
 812                         InitGame(); Setup = 0;\r
 813                         continue;\r
 814                 }\r
 815                 if (!strcmp(command, "edit")) {\r
 816                         int color = WHITE, p, r;\r
 817 \r
 818                         while(fgets(line, 256, stdin)) {\r
 819                                 m = line[0];\r
 820                                 if(m=='.') break;\r
 821                                 if(m=='#') {\r
 822                                         for(i=0; i<128; i++) b[i]=0;\r
 823                                         for(i=0; i<32; i++) pl[i]=0;\r
 824                                         Q=0; R=0; O=S;\r
 825                                         pl[WHITE]=pl[BLACK]=0;\r
 826                                         continue;\r
 827                                 }\r
 828                                 if(m=='c') {\r
 829                                         color = WHITE+BLACK - color;\r
 830                                         Q = -Q;\r
 831                                         continue;\r
 832                                 }\r
 833                                 if( m >= 'A' && m <= 'Z' && piecetype[m&31]) {\r
 834                                     p = (color == WHITE ? piecetype : blacktype)[line[0]&31];\r
 835                                     if(line[1] == '@') { // stuff holdings\r
 836                                         pl[color+p+5] = m = line[2] - '0';\r
 837                                         pl[BLACK+WHITE-color]+=m;pl[p+color]+=m;\r
 838                                         Q+=m*w[p]; R+=m*(w[p]/FAC);\r
 839                                         continue;\r
 840                                     } else\r
 841                                     if(line[1] >= 'a' && line[1] <= 'a'+BW-1\r
 842                                     && line[2] >= '1' && line[2] <= '0'+BH) {\r
 843                                         m = line[1]-16*line[2]+799; r = m & 0x70;\r
 844                                         switch(p)\r
 845                                         {\r
 846                                         case 1:\r
 847                                         case 2:\r
 848                                             if(color==WHITE)\r
 849                                                  b[m]=r==0x10?161:r==0x20?97:r==0x60?1:33,\r
 850                                                  Q+=w[1]+(r==0x10?S:r==0x20?64:0);\r
 851                                             else b[m]=r==0x60?178:r==0x50?114:r==0x10?18:50,\r
 852                                                  Q+=w[2]+(r==0x60?S:r==0x50?64:0);\r
 853                                             break;\r
 854                                         default:\r
 855                                             b[m]=p+color+32; // assume non-virgin\r
 856                                             if(color==BLACK && m<0x10 && p==oo[m+16] || // but make virgin on original square\r
 857                                                color==WHITE && m>0x6F && p==oo[m-0x70]) b[m] -= 32;\r
 858                                             if(w[p]<0) { // Royal piece on original square: virgin\r
 859                                                 Q-=w[p]; // assume value was flipped to indicate royalty\r
 860                                                 if(pl[p+color])R-=w[p]/FAC; // capturable King, add to material\r
 861                                             } else { Q+=w[p]; R+=w[p]/FAC; }\r
 862                                         case 0: // undefined piece, ignore\r
 863                                             break;\r
 864                                         }\r
 865                                         pl[BLACK+WHITE-color]++; if(pl[p+color]++&1) Q+=pb[p];\r
 866                                         if(w[p+color] == -1)pl[p+color]=1; // fake we have one if value = -1, to thwart extinction condition\r
 867                                         continue;\r
 868                                     }\r
 869                                 }\r
 870                         }\r
 871                         if(Side != color) Q = -Q;\r
 872                         GamePtr = HistPtr = 0; Setup = 1; SetupQ = Q; // start anew\r
 873                         for(i=0; i<128; i++) setupPosition[i] = b[i]; // remember position\r
 874                         setupPosition[128] = Side;\r
 875                         setupPosition[129] = R;\r
 876                         for(i=0; i<32; i++) setupPosition[i+130] = pl[i];\r
 877                         Computer = EMPTY; // after edit: force mode!\r
 878                         continue;\r
 879                 }\r
 880                 /* command not recognized, assume input move */\r
 881                 m = line[0]<'a' | line[0]>='a'+BW | line[1]<'1' | line[1]>='1'+BH |\r
 882                     line[2]<'a' | line[2]>='a'+BW | line[3]<'1' | line[3]>='1'+BH;\r
 883                 if(line[4] == '\n') line[4] = 0;\r
 884                 GT = (Side == WHITE ? piecetype : blacktype)[line[4]&31];\r
 885                 if(GT) PromPiece = (Side == WHITE ? 7 : 7+pm) - GT, GT |= 32 + Side;\r
 886                 {char *c=line; K=c[0]-16*c[1]+799;L=c[2]-16*c[3]+799; }\r
 887                 if(w[GT&15] == -1) L = S; // spoil move for promotion to King\r
 888                 if (m & line[1] != '@')\r
 889                         /* doesn't have move syntax */\r
 890                         printf("Error (unknown command): %s\n", command);\r
 891                 else { int i=-1;\r
 892                     if(b[L] && (b[L]&16) == Side && w[b[L]&15] < 0) // capture own King: castling\r
 893                     { i=K; K = L; L = i>L ? i-1 : i+2; }\r
 894                     if((b[K]&15) < 3) GT = 0; // Pawn => true promotion rather than gating\r
 895                     if(D(Side,-I,I,Q,O,LL|S,3)!=I) {\r
 896                         /* did have move syntax, but illegal move */\r
 897                         printf("Illegal move:%s\n", line);\r
 898                     } else {  /* legal move, perform it */\r
 899                         if(i >= 0) b[i]=b[K],b[K]=0; // reverse Seirawan gating\r
 900                         GameHistory[GamePtr++] = PACK_MOVE;\r
 901                         Side ^= BLACK^WHITE;\r
 902                         CopyBoard(HistPtr=HistPtr+1&1023);\r
 903                         if(PrintResult(Side)) Computer = EMPTY;\r
 904                     }\r
 905                 }\r
 906         }\r
 907 }\r