x-----------------+
| r n b q k b n r | 8
| p p p p p p p p | 7
| . . . . . . . . | 6
| . . . . . . . . | 5
| . . . . P . . . | 4
| . . . . . . . . | 3
| P P P P . P P P | 2
| R N B Q K B N R | 1
+-----------------x
a b c d e f g h
x-----------------+
| r n b q k b n r | 8
| p p p p . p p p | 7
| . . . . . . . . | 6
| . . . . p . . . | 5
| . . . . P . . . | 4
| . . . . . . . . | 3
| P P P P . P P P | 2
| R N B Q K B N R | 1
+-----------------x
a b c d e f g h