White to move and win.
7b/4K1kn/8/8/5P2/8/R7/8 w – – 0 1
Zakhodiakin, 1930
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1. Rg2+ and 2. Kf7 wins a piece, then the exchange +P ending is a win.b
1. Rg2+ Kh6 2. Kf7 Nf6 =
1. Ra8!, and black has no good moves
It is not so easy as it looks.
1.Rg2+? Kh6 2.Kf7 Nf6 3.Rf7+Kh5 4.Rxf6 Kg4! draws.
1.Ra8? Nf6! 2.Rxh8 Nd5+
So, my solution is :
1.Ra6! Nf8
(1..Kg8 2.Ra8+ Kg7 3.Rxh8! Kxh8 4.Kf7)
2.f5 Kg8 3.Ra8 Bg7 4.f6 Bxf6+ 5.Kxf6 , wins
Ra6!, very subtle to gain a tempo on the Ra8 line.
Ra6 wins
1.Rg2+ Kh6
2.Kf7 Nf6
3.Rg6+ Kh7
4.Rxf6 Bxf6
5.Kxf6 1-0
1.Ra6! Kg8 2.Ra8+ Kg7 3.Rxh8! KxR
4.Kf7! and Black has to give up the knight with in every case a winning pawn endgame !
1. Ra6! is the solution, with two main branches, 1… Nf8 and Kg8.
1.. Nf8 is the shorter one:
2. f5 Nh7 (2… Kg8 3. Ra8 Bg7 4. f6 Bh6 5. f7+ is trivial)
3. Rg6# out of the blue.
if 1… Kg8
2. Ra8+! and as Timothée Tournier explained, the end zugzwang position decides the game.
(Zakhodyakin, 64, 1930, #451, recommandation)