In a 8x8 sized chessboard, both black and white play with 16 pieces each, which limits the pieces on board to 32.
Each colour's pieces consist of:
How many different (and possible) positions exist?
- 8 pawns
- 2 rooks
- 2 bishops
- 2 knights
- a queen
- a king
Take into account that:
- The white pawns cannot reach the first rank and likewise, the black pawns cannot reach the eight rank.
- A bishop can only move on half of the squares, either white or black ones (one of each colour moves but on white squares, the other on black squares only).
- White pawns that reach the eight rank and black pawns that reach the first rank can be promoted to either a rook, knight, bishop or queen of the respective colour, independently of the pieces taken prior to the promotion.
- Pawns may only change the file they move in by taking pieces.
- A pawn cannot reach the opposing rank (8 for white, 1 for black) if the opponent's pawn in the file it's moving in is not taken.
- The two kings must not stand next to each other.
- During play, all pieces except for the two kings may be taken.