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