First move: ##

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

##:() - 18:7