First move: ##

   A  B  C  D  E  F  G  H
1 |  |  |  |  |  |  |  |  | 1
2 |  |  |15|17|10|  |  |  | 2
3 |  |  | 8| 9| 2| 6|  |  | 3
4 |  |13| 1|()|##| 3|  |  | 4
5 |  |21| 4|##|()|12|  |  | 5
6 |  |11|20| 5| 7|14|  |  | 6
7 |  |  |18|19|16|  |  |  | 7
8 |  |  |  |  |  |  |  |  | 8
   A  B  C  D  E  F  G  H

##:() - 12:13