# Repetition of move in Draughts game

I am having a little problem in my draughts game. Lets say my red piece (moving through AI) has arrived at the border of black pieces and now it has become a king, lets assume it is at index 2. Now when its next AI's turn, this piece moves to index 5, thats ok. But on next turn it moves to index 2 and then this transition between index 2 and 5 continues in every turn. I can't figure out whats wrong. I have revised my generate_moves() and it seems ok. Any idea what can be wrong? – My evaluation function is as follows:

public double Evaluation(int type, int aBoard[]) {

double reds, blacks, ret=0.0;
int loop;

for(reds=blacks=loop=0;loop<32;loop++) {
switch(aBoard[loop]) {
case 2: //redKingType:
reds+=1;
case 0://redType:
reds+=1;
break;
case 3://blackKingType:
blacks+=1;
case 1://blackType:
blacks+=1;
break;
default:
break;
}
}
switch(type) {
case 0://redType:
case 2://redKingType
if(reds==0) {
return 0.0;
}
if(blacks==0) {
return 24.0;
}
ret=reds/blacks;
return ret;
case 1://blackType
case 3://blackKingType
if(reds==0) {
return 24.0;
}
if(blacks==0) {
return 0.0;
}
ret=blacks/reds;
return ret;
default:
break;
}

return ret;
}


Note: I know this a very simple evaluation function ,but please consider the fact that I am doing this for the first time, under a hard deadline.