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kf6
In an OTB game, I doubt I would see White’s win at this point, but I would probably start with Bd7 anyway to see what would happen. As it happens, it’s the only winning move.
1. Bd7
It seems that all Black has to do is target e8 and wait for the promotion to capture it for a draw, but …
1. … Bb3
2. e7 Bf7
3. Kf6 (Not 3. Bg5, giving the Black king g7)
3. … Bh5 (Not 3. … Kg8 4. Be6.)
4. Kg5
This position is reached also through 1. … Bc2+ 2. Kf6 Bd1 3. e7 Bh5 4. Kg5 Bf7.
4. … Bf7
5. Kh6
Black is stuck. Any bishop move off of the e8-h5 diagonal allows promotion; any bishop move on the diagonal loses the bishop; … K-g8 allows Be6; only the a-pawn can move, and it will run out of moves soon.
5. … a6 (5. … a5 6. Ba4 loses as after 7. Ba4 below.)
6. Bc6 (6. Ba4 a5 is a draw: 7. Bb3 Be8 and the bishop cannot be dislodged from attacking e8. 7. Bc6 a4 8. Bxa4 Kg8 and Black can shuttle the king back and forth between g8 and h8. If 9. Bb3 Kh8 and 10. Kxf7 is stalemate. This is what I missed at the beginning.)
6. … a5
7. Ba4
Now Black has no move that doesn’t lose the bishop or the game right away. (7. … Kg8 8. Bb3 a4 9. e8(Q)#.)
bd7
1. Bc8-a6
–br
Bishop D7
1.Bd7 Bb3 2.e7 Bf7 3.Kf6 Bh5 4.Kg5 Bf7 5.Kh6 1-0
1.Bd7! Bb3 ! (Bc2+ Kf6! is no problem)
2. e7! Bf7 3.Kf6! Bh5 4. Bc6!!
(if Kg8 5.Bb3 followed by Bf7!)
a6! 5. Bd7! a5 6. Ba4!! +-
1.Bd7 Bb3 2.e7 Bf7 3.Kf6 Bh5 4.Kg5 Bf7 5.Kh6! a5 6.Ba4 (Zugzwang) Kg8 Bb3 winning.
I think, without a-pawn, black plays here Kh8 and it’s draw.
Mdaaa, this is too hard for me. Half an hour and no result! Nalimov helped me. Next time, please, add 2 blocked pawns to avoid 6-men searches, I couldn’t resist 🙂