for(i = 0 ; i < 12 ; i++){
if (i == 7 || i == 9) {
continue; // Goes to the next iteration.
}
else
{
ofSetColor(200);
ofCircle(blackLocX[i], blackLocY[i], pieceR);
}
}
... that said, there is probably a more flexible way to do whatever it is you're doing