Daily puzzles #6.
Yesterday's puzzle appeared quite tough for most of post's readers. Only one person (who is TD-I-Prevail) has found the correct idea but couldn't argue it properly. The trick is that all endgames where White has pawn on h6 and dark squared bishop while Black has king in the corner and pawn on h7 are drawn.
The correct answer is in the correct question: "What was the last Black's move?" And here just one possible answer to this: 1...g7-g5! So, White can take en-passant. Sorry for this joke, but answer is 100% of chess nature.