In Variable Chess (V-chess) the rules are the same as in orthodox chess except that a knight or a bishop is first placed outside the board. White first removes a light piece and then black removes one of his light pieces and places it behind the board. These pieces can at any time be introduced via any empty square on the first rank and move immediately, effectively a double-move. They can be introduced at any time, provided that a move exists that originates from the first rank. For instance, if the white queen has already moved away, a knight can be introduced via d1, thus reaching the square b2 (provided that it is empty). A bishop cannot be inserted on the same colour squares as the other bishop. Variable Chess is intended as an alternative to standard chess, radically increasing the ramification of openings. By waiting a few moves before introducing an external piece, a player can hide his strategical intentions. In an alternative variant, two light pieces per player are placed outside the board. In this case white removes his two pieces first.