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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Kg1 draw
3 Kg2 draw
4 Kg7 draw
5 Kh1 draw
6 Kh3 draw
7 Kh5 draw
8 Rb8 draw
9 Kf5 loss in 2 half-moves
10 Kf6 loss in 2 half-moves
11 Kf7 loss in 2 half-moves
12 Kg3 loss in 2 half-moves
13 Kg5 loss in 2 half-moves
14 Kh6 loss in 2 half-moves
15 Kh7 loss in 2 half-moves
16 Ra8 loss in 2 half-moves
17 Rc8 loss in 2 half-moves
18 Rd8 loss in 2 half-moves
19 Re8 loss in 2 half-moves
20 Rf8 loss in 2 half-moves
21 Rh8 loss in 2 half-moves