for (var i = 1; i < alt_moves.length && i < 3; ++i) {
hiddenboard = new Chess(base_fen);
var move = hiddenboard.move(alt_moves[i]);
for (var i = 1; i < alt_moves.length && i < 3; ++i) {
hiddenboard = new Chess(base_fen);
var move = hiddenboard.move(alt_moves[i]);