if (move_override > 0) {
var last_move = history[move_override - 1];
var highlight_from = last_move.from;
var highlight_to = last_move.to;
if (move_override > 0) {
var last_move = history[move_override - 1];
var highlight_from = last_move.from;
var highlight_to = last_move.to;