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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 K7g8 draw
3 K8g8 draw
4 Kh6 draw
5 Ra3 draw
6 Ra8 draw
7 Rb7 draw
8 Rc7 draw
9 K7g7 loss in 2 half-moves
10 K8g7 loss in 2 half-moves
11 Kg6 loss in 2 half-moves
12 Ra1 loss in 2 half-moves
13 Ra2 loss in 2 half-moves
14 Ra4 loss in 2 half-moves
15 Ra5 loss in 2 half-moves
16 Ra6 loss in 2 half-moves
17 Rd7 loss in 2 half-moves
18 Re7 loss in 2 half-moves
19 Rf7 loss in 2 half-moves