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1 Bg5
Perényi Béla!!
1.Fg5 ! wining
My spontaneous thought is: 1. Bg5.
If 1. – , fxg5 then 2. Kg6 and an immediate checkmate threat appears on the 8th row through Rd8. For example: 2. – , Re2 3. Rd8+, Re8 4. Rxe8#.
If 1. – , g1Q then 2. Bxf6+, Kg8 (2. – , Qg7 3. hxg7+ etc.) 3. h7+, Kf8 4. h8Q+, Qg8 5. Rd8+ and the game is over.
Just a litte addition to my comment above.
If after 1. Bg5 black replies 1. – , Re2+ then white simply moves away his king: 2. Kg6. Black has no checks left.
And yet again there is an immediate checkmate threat on the 8th row through the coming 3. Rd8+.
White would love to play Kg6 and enforce the back rank mate, but the incipient queen at g1 inhibits this plan. However, white does have a way to muck up black’s defense:
1. Bg5! g1Q
If there is any defense better than this, I am missing it completely. Continuing:
2. Bf6
The point of queening the pawn is to prevent white from immediately playing Kg6. Continuing:
2. …..Qg7
It is a short mate after 2. …Kg8: [2. …Kg8 3.h7! Kf8 4.Rd8 Kf7 5.h1N#]. Continuing:
3. Bg7
And this ending is clearly won for white since the h-pawn will either queen, or white will mate black shortly.
1. Bg5, threatening
2. Bxf6+ Kg8
3. h7+ Kf8
4. h8=Q#
1. … fxg5
2. Kg6, threatening
3. Rd8#, which can be delayed but not escaped.
1. … Rf2+
2. Kg6, threatening
3. Rd8# as above.