4x5 board
+--+--+--+--+--+
|WK| 5| 9|13|BK|
+--+--+--+--+--+
| 2| 6|10|14|18|
+--+--+--+--+--+
|WB| 7|11|15|BB|
+--+--+--+--+--+
| 4| 8|12|16|20|
+--+--+--+--+--+
|
Starting from this position,
- Swap the positions of the white knight and white bishop.
- Swap the colors (swap the positions of the two knights and
the two bishops.)
At no time may any piece be under attack by a piece of the opposite
color. Moves do not need to alternate in color.
|