First move: ##

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

##:() - 15:9