Chess/Puzzles/Directmates/Twomove 4/Solution
It is quite simple to show that the only move black could have made to reach this position was b7b5. Thus, a5 can take b5 en passant.
1.a5xb6 a3
2.b7#

It is quite simple to show that the only move black could have made to reach this position was b7b5. Thus, a5 can take b5 en passant.
1.a5xb6 a3
2.b7#
