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<HTML>
<HEAD>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
<SCRIPT language=JavaScript>
<!--
ie4=(navigator.appName.indexOf("Microsoft")!=-1 && parseInt(navigator.appVersion)>3)?true:false;
ie3=(navigator.appName.indexOf("Microsoft")!=-1 && parseInt(navigator.appVersion)<4)?true:false;

boardSize=15;
userSq= 1;
machSq=-1;
blinkSq="b-1";
blinkHint="b1";
myTurn=false;
winningMove=9999999;
openFour   =8888888;
twoThrees  =7777777;

if (document.images) {
 uImg=new Image(); uImg.src='s'+userSq+'.gif';
 mImg=new Image(); mImg.src='s'+machSq+'.gif';
 uIm1=new Image(); uIm1.src='sb1.gif';
 mIm1=new Image(); mIm1.src='sb-1.gif';
 bImg=new Image(); bImg.src='s0.gif';
}

f=new Array();
s=new Array();
q=new Array();

iMax=new Array();
jMax=new Array();
nMax=0;

for (i=0;i<20;i++) {
 f[i]=new Array();
 s[i]=new Array();
 q[i]=new Array();
 for (j=0;j<20;j++) {
  f[i][j]=0;
  s[i][j]=0;
  q[i][j]=0;
 }
}

iLastUserMove=0;
jLastUserMove=0;

function clk(iMove,jMove) {
 if (myTurn || autoplayOn) return; 
 hideHint();

 if (f[iMove][jMove]!=0) {alert('这一格已经有棋子了！[程序来自www.21windows.com]'); return; }
 f[iMove][jMove]=userSq;
 drawSquare(iMove,jMove,userSq);
 myTurn=true;
 iLastUserMove=iMove;
 jLastUserMove=jMove;

 dly=(document.images)?10:boardSize*30;

 if (winningPos(iMove,jMove,userSq)==winningMove) setTimeout('gameOver=1;alert("恭喜你，你赢了！[程序来自www.21windows.com]")',dly);
 else setTimeout("machineMove(iLastUserMove,jLastUserMove);",dly);
}

function getBestMachMove() {
 maxS=evaluatePos(s,userSq);
 maxQ=evaluatePos(q,machSq);

 // alert ('maxS='+maxS+', maxQ='+maxQ);

 if (maxQ>=maxS) {
  maxS=-1;
  for (i=0;i<boardSize;i++) {
   for (j=0;j<boardSize;j++) {
    if (q[i][j]==maxQ) {
     if (s[i][j]>maxS) {maxS=s[i][j]; nMax=0}
     if (s[i][j]==maxS) {iMax[nMax]=i;jMax[nMax]=j;nMax++} 
    }
   }
  }
 }
 else {
  maxQ=-1;
  for (i=0;i<boardSize;i++) {
   for (j=0;j<boardSize;j++) {
    if (s[i][j]==maxS) {
     if (q[i][j]>maxQ) {maxQ=q[i][j]; nMax=0}
     if (q[i][j]==maxQ) {iMax[nMax]=i;jMax[nMax]=j;nMax++} 
    }
   }
  }
 }
 // alert('nMax='+nMax+'\niMax: '+iMax+'\njMax: '+jMax)

 randomK=Math.floor(nMax*Math.random());
 iMach=iMax[randomK];
 jMach=jMax[randomK];
}

function getBestUserMove() {
 maxQ=evaluatePos(q,machSq);
 maxS=evaluatePos(s,userSq);

 if (maxS==-1) {
  center=Math.floor(boardSize/2);
  s[center][center]=1
  maxS=1; 
 }

 if (maxS>=maxQ) {
  maxQ=-1;
  for (i=0;i<boardSize;i++) {
   for (j=0;j<boardSize;j++) {
    if (s[i][j]==maxS) {
     if (q[i][j]>maxQ) {maxQ=q[i][j]; nMax=0}
     if (q[i][j]==maxQ) {iMax[nMax]=i;jMax[nMax]=j;nMax++} 
    }
   }
  }
 }
 else {
  maxS=-1;
  for (i=0;i<boardSize;i++) {
   for (j=0;j<boardSize;j++) {
    if (q[i][j]==maxQ) {
     if (s[i][j]>maxS) {maxS=s[i][j]; nMax=0}
     if (s[i][j]==maxS) {iMax[nMax]=i;jMax[nMax]=j;nMax++} 
    }
   }
  }
 }

 // alert('nMax='+nMax+'\niMax: '+iMax+'\njMax: '+jMax)

 randomK=Math.floor(nMax*Math.random());
 iHint=iMax[randomK];
 jHint=jMax[randomK];
}

function machineMove(iUser,jUser) {
 getBestMachMove();
 f[iMach][jMach]=machSq;
 if (document.images) {
  drawSquare(iMach,jMach,blinkSq);
  setTimeout("drawSquare(iMach,jMach,machSq)",900);
 }
 else {
  drawSquare(iMach,jMach,machSq);
 }
 if (winningPos(iMach,jMach,machSq)==winningMove) setTimeout('gameOver=1;alert("你已经输了！[程序来自www.21windows.com]");',900);
 else if (drawPos) setTimeout('gameOver=1;alert("此局是平局！")',900);
 else setTimeout("myTurn=false;",950);
}

function hasNeighbors(i,j) {
 if (j>0 && f[i][j-1]!=0) return 1;
 if (j+1<boardSize && f[i][j+1]!=0) return 1; 
 if (i>0) {
  if (f[i-1][j]!=0) return 1;
  if (j>0 && f[i-1][j-1]!=0) return 1;
  if (j+1<boardSize && f[i-1][j+1]!=0) return 1;
 }
 if (i+1<boardSize) {
  if (f[i+1][j]!=0) return 1;
  if (j>0 && f[i+1][j-1]!=0) return 1;
  if (j+1<boardSize && f[i+1][j+1]!=0) return 1;
 }
 return 0;
}

w=new Array(0,20,17,15.4,14,10);
nPos=new Array();
dirA=new Array();

function winningPos(i,j,mySq) {
 test3=0;
 test4=0;

 L=1;
 m=1; while (j+m<boardSize  && f[i][j+m]==mySq) {L++; m++} m1=m;
 m=1; while (j-m>=0 && f[i][j-m]==mySq) {L++; m++} m2=m;   
 if (L>4) { return winningMove; }
 side1=(j+m1<boardSize && f[i][j+m1]==0);
 side2=(j-m2>=0 && f[i][j-m2]==0);

 if (L==4 && (side1 || side2)) test3++;
 if (side1 && side2) {
  if (L==4) test4=1;
  if (L==3) test3++;
 }

 L=1;
 m=1; while (i+m<boardSize  && f[i+m][j]==mySq) {L++; m++} m1=m;
 m=1; while (i-m>=0 && f[i-m][j]==mySq) {L++; m++} m2=m;   
 if (L>4) { return winningMove; }
 side1=(i+m1<boardSize && f[i+m1][j]==0);
 side2=(i-m2>=0 && f[i-m2][j]==0);
 if (L==4 && (side1 || side2)) test3++;
 if (side1 && side2) {
  if (L==4) test4=1;
  if (L==3) test3++;
 }

 L=1;
 m=1; while (i+m<boardSize && j+m<boardSize && f[i+m][j+m]==mySq) {L++; m++} m1=m;
 m=1; while (i-m>=0 && j-m>=0 && f[i-m][j-m]==mySq) {L++; m++} m2=m;   
 if (L>4) { return winningMove; }
 side1=(i+m1<boardSize && j+m1<boardSize && f[i+m1][j+m1]==0);
 side2=(i-m2>=0 && j-m2>=0 && f[i-m2][j-m2]==0);
 if (L==4 && (side1 || side2)) test3++;
 if (side1 && side2) {
  if (L==4) test4=1;
  if (L==3) test3++;
 }

 L=1;
 m=1; while (i+m<boardSize  && j-m>=0 && f[i+m][j-m]==mySq) {L++; m++} m1=m;
 m=1; while (i-m>=0 && j+m<boardSize && f[i-m][j+m]==mySq) {L++; m++} m2=m; 
 if (L>4) { return winningMove; }
 side1=(i+m1<boardSize && j-m1>=0 && f[i+m1][j-m1]==0);
 side2=(i-m2>=0 && j+m2<boardSize && f[i-m2][j+m2]==0);
 if (L==4 && (side1 || side2)) test3++;
 if (side1 && side2) {
  if (L==4) test4=1;
  if (L==3) test3++;
 }

 if (test4) return openFour;
 if (test3>=2) return twoThrees;
 return -1;
}

function evaluatePos(a,mySq) {
 maxA=-1;
 drawPos=true;

 for (i=0;i<boardSize;i++) {
  for (j=0;j<boardSize;j++) {

   // Compute "value" a[i][j] of the (i,j) move

   if (f[i][j]!=0) {a[i][j]=-1; continue;}  
   if (hasNeighbors(i,j)==0) {a[i][j]=-1; continue;}

   wp=winningPos(i,j,mySq);
   if (wp>0) a[i][j]=wp;
   else {
    minM=i-4; if (minM<0) minM=0;
    minN=j-4; if (minN<0) minN=0;
    maxM=i+5; if (maxM>boardSize) maxM=boardSize;
    maxN=j+5; if (maxN>boardSize) maxN=boardSize;

    nPos[1]=1; A1=0;
    m=1; while (j+m<maxN  && f[i][j+m]!=-mySq) {nPos[1]++; A1+=w[m]*f[i][j+m]; m++}
    if (j+m>=boardSize || f[i][j+m]==-mySq) A1-=(f[i][j+m-1]==mySq)?(w[5]*mySq):0;
    m=1; while (j-m>=minN && f[i][j-m]!=-mySq) {nPos[1]++; A1+=w[m]*f[i][j-m]; m++}   
    if (j-m<0 || f[i][j-m]==-mySq) A1-=(f[i][j-m+1]==mySq)?(w[5]*mySq):0;
    if (nPos[1]>4) drawPos=false;

    nPos[2]=1; A2=0;
    m=1; while (i+m<maxM  && f[i+m][j]!=-mySq) {nPos[2]++; A2+=w[m]*f[i+m][j]; m++}
    if (i+m>=boardSize || f[i+m][j]==-mySq) A2-=(f[i+m-1][j]==mySq)?(w[5]*mySq):0;
    m=1; while (i-m>=minM && f[i-m][j]!=-mySq) {nPos[2]++; A2+=w[m]*f[i-m][j]; m++}   
    if (i-m<0 || f[i-m][j]==-mySq) A2-=(f[i-m+1][j]==mySq)?(w[5]*mySq):0; 
    if (nPos[2]>4) drawPos=false;

    nPos[3]=1; A3=0;
    m=1; while (i+m<maxM  && j+m<maxN  && f[i+m][j+m]!=-mySq) {nPos[3]++; A3+=w[m]*f[i+m][j+m]; m++}
    if (i+m>=boardSize || j+m>=boardSize || f[i+m][j+m]==-mySq) A3-=(f[i+m-1][j+m-1]==mySq)?(w[5]*mySq):0;
    m=1; while (i-m>=minM && j-m>=minN && f[i-m][j-m]!=-mySq) {nPos[3]++; A3+=w[m]*f[i-m][j-m]; m++}   
    if (i-m<0 || j-m<0 || f[i-m][j-m]==-mySq) A3-=(f[i-m+1][j-m+1]==mySq)?(w[5]*mySq):0; 
    if (nPos[3]>4) drawPos=false;

    nPos[4]=1; A4=0;
    m=1; while (i+m<maxM  && j-m>=minN && f[i+m][j-m]!=-mySq) {nPos[4]++; A4+=w[m]*f[i+m][j-m]; m++;}
    if (i+m>=boardSize || j-m<0 || f[i+m][j-m]==-mySq) A4-=(f[i+m-1][j-m+1]==mySq)?(w[5]*mySq):0;
    m=1; while (i-m>=minM && j+m<maxN  && f[i-m][j+m]!=-mySq) {nPos[4]++; A4+=w[m]*f[i-m][j+m]; m++;} 
    if (i-m<0 || j+m>=boardSize || f[i-m][j+m]==-mySq) A4-=(f[i-m+1][j+m-1]==mySq)?(w[5]*mySq):0;
    if (nPos[4]>4) drawPos=false;

    dirA[1] = (nPos[1]>4) ? A1*A1 : 0;
    dirA[2] = (nPos[2]>4) ? A2*A2 : 0;
    dirA[3] = (nPos[3]>4) ? A3*A3 : 0;
    dirA[4] = (nPos[4]>4) ? A4*A4 : 0;

    A1=0; A2=0;
    for (k=1;k<5;k++) {
     if (dirA[k]>=A1) {A2=A1; A1=dirA[k]}
    }
    a[i][j]=A1+A2;
   }
   if (a[i][j]>maxA) {
    maxA=a[i][j];
   }
  }
 }
 return maxA;
}

function drawSquare(par1,par2,par3) {
 if (document.images) {
  eval('self.f1.document.s'+par1+'_'+par2+'.src="s'+par3+'.gif"');
 }
 else setTimeout("writeBoard()",50);
}

hintShown=false;
iHint=jHint=6;

function showHint () {
 if (myTurn && autoplayOn) return;
 if (hintShown) {hideHint();return;}
 hintShown=1;
 getBestUserMove();

 if (document.images) {
  drawSquare(iHint,jHint,blinkHint);
 }
}

function hideHint() {
 hintShown=0;
 drawSquare(iHint,jHint,f[iHint][jHint]);
}

function autoplay() {
 if (autoplayOn) {
  if (myTurn) {
   getBestMachMove();
   f[iMach][jMach]=machSq;
   drawSquare(iMach,jMach,blinkSq);
   timerDR=setTimeout("drawSquare(iMach,jMach,machSq);",900);
   if (winningPos(iMach,jMach,machSq)==winningMove) setTimeout('gameOver=1;alert("白棋获胜！黑棋负！[程序来自www.21windows.com]")',900);
   else if (drawPos) setTimeout('alert("此局是平局！[程序来自www.21windows.com]")',900);
   else { myTurn=false; timerAP=setTimeout("autoplay()",950); }
  }
  else {
   getBestUserMove();
   f[iHint][jHint]=userSq;
   drawSquare(iHint,jHint,blinkHint);
   timerDR=setTimeout("drawSquare(iHint,jHint,userSq)",900);
   if (winningPos(iHint,jHint,userSq)==winningMove) setTimeout('gameOver=1;alert("黑棋获胜！白棋负！[程序来自www.21windows.com]")',900);
   else { myTurn=true; timerAP=setTimeout("autoplay()",950); }
  }
 }
}

autoplayOn=0;
timerAP=0;
function setAutoplay() {
 if (gameOver) resetGame();
 if (autoplayOn) {
  if (myTurn) { setTimeout("setAutoplay()",950); return; }
  autoplayOn=0;clearTimeout(timerAP);return;
 }
 if (document.images) setTimeout("hideHint();autoplayOn=1;autoplay();",100);
 else alert('Sorry, Autoplay Mode is not supported for your browser!');
}

buf='';

function writeBoard () {
 if (parseInt(navigator.appVersion)>3) docID=top.f1.document.open("text/html","replace");
 buf+='<html><head><title>五子棋</title>';
 if (navigator.appName=="Netscape") buf+='<base href="'+top.document.location+'">';
 buf+='</head><body leftmargin=0 topmargin=0><a name="s"></a><center><pre';
 for (i=0;i<boardSize;i++) {
  for (j=0;j<boardSize;j++) {
   buf+='\n><a href="#s" onClick="top.clk('+i+','+j+');if(top.ie4)this.blur();return false;" ><img name="s'+i+'_'+j+'" src="s'+f[i][j]+'.gif" width=21 height=21 border=0></a'; 
  }
  buf+='\n><br';
  if (buf.length>10000) {top.f1.document.writeln(buf); buf='';}
 }
 buf+='\n></pre></center></body></html>';
 top.f1.document.writeln(buf);
 top.f1.document.close();
 buf='';
}

function resetGame() {
 if (autoplayOn) {autoplayOn=0;clearTimeout(timerAP);clearTimeout(timerDR);}
 drawPos=0;
 myTurn=0;
 autoplayOn=0;
 gameOver=0;

 for (i=0;i<20;i++) {
  for (j=0;j<20;j++) {
   f[i][j]=0;
  }
 }

 if (!top.f1.document) return;
 if (document.images) {
  if (!top.f1.document.s9_9) return;
  for (i=0;i<boardSize;i++) {
   for (j=0;j<boardSize;j++) {
    eval('self.f1.document.s'+i+'_'+j+'.src=bImg.src');  
   }
  }
 }
 else writeBoard();
}

function init() {
 if (autoplayOn) {autoplayOn=0;clearTimeout(timerAP);clearTimeout(timerDR);}
 writeBoard();
 resetGame();
}

//-->

</SCRIPT>
<title>欢乐五子棋</title></HEAD>
<body leftmargin="0" topmargin="0">
<table width="420" border="0" cellspacing="1" cellpadding="0" bgcolor="#000000" align="center">
  <tr> 
    <td><iframe src=button.htm width=420 height=100 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=NO name=fb></iframe> 
</td>
  </tr>
  <tr>
    <td><iframe src=main.htm width=420 height=420 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=NO name=f1></iframe> 
</td>
  </tr>
</table>
</HTML>

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