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EGTB: win in 4 half-moves

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