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I’d move 1.Bg7, then Black either has to move his bishop or h-pawn. If he moves the pawn and then avoids moving the bishop, I think white can win the f-pawn. If he moves the bishop, White can win the a0pawn.
Bg7
zugzwang
Bg7, Zugzwang
Bg7, and black is in a nasty zugzwang.
This seems to have zugzwang theme written all over it, so Bg7, immobilizing black’s king, suggests itself immediately. However, as I got into this, it is definitely instructive for how to manage different threats to force black’s hand. Let’s deal with the clear losing line for black at move 1:
1. Bg7 Bc4 (alternatives below)
2. Kb7 and black will lose the bishop and the game to stop the a-pawn, and there are no stalemate problems in this line due to black’s h5/h6 move. So, let’s move to the more relevant lines where black moves the h-pawn on move 1:
1. Bg7 h5 (or h6)
2. gh6 Kh7
Or [2. …g5 3.hg5 Kh7 4.Kc5 Bc4 5.Kd6 Kg6 (or 5. …Bb3 6.Kc7 wins b7 pawn; or 5. …Be2 6.Kd5 wins; or 5. …Kg8 6.g6! fg6 7.Ke7+-) 6.Ke7 Be2 7.h7 Kh7 8.Kf7 Bg6 9.Kf8+-]. Continuing from move 2 above:
3. Kc5 Bc4
4. Kd6 Kg8
Here, g5 transposes to the line in the subvariation decribed above at move 2. Also, Bb3 or Ba2 loses the pawn at b7 to Kc7, and Bd3/e2/f1 loses the pawn at d5. Continuing:
5. Ke7 Be2
Or [5. …g5 6.hg5 Bd3 7.Kd6 Bc4 8.g6! fg6 9.Ke7+-]. Continuing:
6. h7! Kh7
7. Kf7 Bh5 (what else?)
8. Kf8 g5
9. hg5 Bg6
10.f7 Bf7 (last trick)
11.Kf7 b6/b5 (tempting 12.ab6=)
12.g6#
1. Bh6 Kh8
2. Kc5 Bc4
3. Kd6 Bb3
4. Kc7
and black can’t defend the pawn. I think it is 1-0
1. Bg7!
Zugzwang! Wins some pawn immediately.
One possible line is:
1. … B somewhere
2. Kxb7 B somewhere
3. Bh6!
Decisive move to lift the zugzwang! E.g. 3.a6? should lead to stalemate.
3. … anything
4. a6 Bxa6
5. Kxa6 Kh8/Kg8
and in 8 more moves white shall have taken black d-pawn and promoted his own, mating.
Black constantly playing Kg8 and Kh8 while waiting for the mate.
Her is a variation, though:
1. … h6!
2. gxh6
White is up with a pawn, but the zugzwang motive is gone, so this is also a defence for black to look at.
2. … Kh7
3. Kc5 Bc4 (enforced)
4. Kd6
Black bishop beeing decisively prevented by his own d-pawn!
4. … Kg8
5. Ke7 B somewhere
6. h7+ Kxh7
7. Kxf7
Seems to be an easy win for white.
1. Bg7 and white gains a pawn
Haridaran:
1. Bh6 Kh8
2. Kc5 Bc4
3. Kd6 Kg8
And now? Note, this is still won for white, but he needs still to find the right move.