Chess/Puzzles/Directmates/Two-move 4/Solution

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

1.a5xb6 a3

2.b7#

a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h