for (var i = 1; i < alt_moves.length && i < 3; ++i) {
hiddenboard = new Chess(base_fen);
var move = hiddenboard.move(alt_moves[i]);
- create_arrow(move.from, move.to, '#f66', 1, 10);
+ if (move !== null) {
+ create_arrow(move.from, move.to, '#f66', 1, 10);
+ }
}
}