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Brain Teaser

Black is about to play g2 giving him two pawns on the seventh rank. How does white win this?

3k4/N4p2/1R6/8/3P4/6p1/p2K4/8 w - - 0 1

v-1

1.Rd6+! Ke8
2.Nc6 Kf8
3.Rd8+ Kg7
4.Ra8 g2
5.Ne7 Kh7
6.Nd5 Kh6
7.Nf6 Kg6
8.Ke2 g1=N+
9.Kf2 Nh3+
10.Kg3 Ng5
11.Nd5 Kf5
12.Nc3 Ne6
13.Ra5+ Kf6
14.d5 Nc5
15.Kf4 Nd3+
16.Ke3 Ne5
17.Rxa2
It's a winning position for white.

V-2

7.Nf6 g1=Q
8.Rh8+ Kg5
9.Rg8+ Kxf6
10.Rxg1
It's a winning position for white.

V-3

7.Nf6 a1=Q
8.Ng8+ Kg6
9.Rxa1 Kg7
10.Ne7 Kf6
11.Nd5+ Kg6
12.Nf4+ Kf5
13.Nxg2
It's a winning position for white.

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