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