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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Ra2 draw
3 Rd2 draw
4 Re2 draw
5 Rf2 draw
6 Rg1 draw
7 Rg6 draw
8 Rg8 draw
9 Kb7 loss in 2 half-moves
10 Kb8 loss in 2 half-moves
11 Kc7 loss in 2 half-moves
12 Kcd7 loss in 2 half-moves
13 Kd5 loss in 2 half-moves
14 Kd6 loss in 2 half-moves
15 Kd8 loss in 2 half-moves
16 Ke5 loss in 2 half-moves
17 Ke7 loss in 2 half-moves
18 Ked7 loss in 2 half-moves
19 Kf5 loss in 2 half-moves
20 Kf6 loss in 2 half-moves
21 Kf7 loss in 2 half-moves
22 Rb2 loss in 2 half-moves
23 Rc2 loss in 2 half-moves
24 Rg3 loss in 2 half-moves
25 Rg4 loss in 2 half-moves
26 Rg5 loss in 2 half-moves
27 Rh2 loss in 2 half-moves