Drop Chess is normal chess except that the board begins empty and both sides begin by taking turns dropping the regular set of 16 pieces onto empty spaces on the board. You cannot move any of your pieces until all of your pieces have been dropped. Pawns can still double move and be captured en passant if they are dropped on their second rank. Pawns promote as usual, but there is no castling. A pawn dropped in the promotion zone does not promote.
 
Note: The computer isn't particulary good at this variant. See the Strategy section for details.