another chess puzzle

Position:
White: king on c8, Bishop on g1, pawn on h2.
Black: king on a8.

White to move. What was white's previous move?

Nb6a8.

It has to have been a move that removed a piece from blocking the bishop.

-Ray.

Situation:

2K5/k7/1K6/8/8/8/7P/6B1

1. Na8 Kxa8

rgoudi was first 🙁

was obviously too easy for you guys :-)

Originally posted by Mephisto2
was obviously too easy for you guys :-)