<SCRIPT LANGUAGE="LiveScript">
     <!---Copyright 1996 Chris Englmeier
     <!---Feel free to use this script as long as these copyright
     <!-- line remain as is
     <!-- 
     step = 0;
     diff=3;
     // change board when button is clicked
     function clear_all(form) {
       step = 0;
       for (i=0;i<9; ++i) {
         position="a"+i;
         form[position].value="";
       }
     }
     // change board when button is clicked
     function clickit(field) {
       if (step == -1) {alert("Reset to play again"); return;}
       position=field.name.substring(1,2,1);
       position = 'a'+position;
       if (field.form[position].value !="") 
          {alert("Can't go there"); return;}
       field.form[position].value="X";
       if (eval_pos(field.form)) {
         field.form.output.value="You Win!"; 
         step = -1;
         return;
       }
       position=get_move(field.form);
       field.form.output.value='I moved to ' + 
                               position.substring(1,2,1);
       if (position=="") {
         field.form.output.value="No Winner."; 
         step = -1;
         return;
       }
       field.form[position].value="O";
       if (eval_pos(field.form)) {
         field.form.output.value="You Lose!";
         step = -1;
       }
     }
     // see if there is a winner
     function eval_pos(form) {
       if ((form.a0.value!="" && form.a0.value==form.a3.value && 
           form.a0.value==form.a6.value)||
           (form.a0.value!="" && form.a0.value==form.a1.value && 
           form.a0.value==form.a2.value) ||
           (form.a0.value!="" && form.a0.value==form.a4.value && 
           form.a0.value==form.a8.value) ||
           (form.a1.value!="" && form.a1.value==form.a4.value && 
           form.a1.value==form.a7.value) ||
           (form.a2.value!="" && form.a2.value==form.a5.value && 
           form.a2.value==form.a8.value) ||
           (form.a2.value!="" && form.a2.value==form.a4.value && 
           form.a2.value==form.a6.value) ||
           (form.a3.value!="" && form.a3.value==form.a4.value && 
           form.a3.value==form.a5.value) ||
           (form.a6.value!="" && form.a6.value==form.a7.value && 
           form.a6.value==form.a8.value))
           return true;
       else	
           return false;
     }
     function f(a) {
       if (a == "") return "."; else return a;
     }
     // get position for move.
     function comp_move(form,player,weight,depth) {
       var cost;
       var bestcost=-2;
       var position;
       var newplayer;
       if (player=="X") newplayer="O"; else newplayer="X";
       if (depth==diff) return 0;
       if (eval_pos(form)) return 1;
       for (var i=0; i<9; ++i) {
         position='a'+i;
         if (form[position].value != "")
           continue;
         form[position].value=player;
         cost = comp_move(form,newplayer, -weight, depth+1);
         if (cost > bestcost) {
           bestcost=cost;
           if (cost==1) i=9;
         }
         form[position].value="";
       }
       if (bestcost==-2) bestcost=0;
       return(-bestcost);
     }
     // get position for move.
     function get_move(form) {
       var cost;
       var bestcost=-2;
       bestmove="";
       // don't think about first move.
       if (step++ == 0)
         if (form.a4.value=="") return "a4";
         else if (form.a0.value=="") return "a0";
         for (var i=0; i<9; ++i) {
           localposition='a'+i;
           if (form[localposition].value != "")
           continue;
         form[localposition].value="O";
         cost=comp_move(form,"X", -1, 0);
         if (cost > bestcost) {
           if (cost==1) i=9;
           bestmove=localposition;
           bestcost=cost;
         }
         form[localposition].value="";
       }
       return bestmove;
     }
     // complain if user attempts to change board
     function complain(field) {
       field.form.output.focus(); // put focus eleswhere
       alert("Don't change the game fields directly!");
     }
     //a href="http://www.woweb.ru/
     // the end -->
   </SCRIPT> 

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