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EGTB: win in 4 half-moves

# move score
1 Rg8 win in 3 half-moves
2 K7g8 draw
3 K8g8 draw
4 Kh6 draw
5 Ra2 draw
6 Rg1 draw
7 Rg3 draw
8 Rg7 draw
9 Rh2 draw
10 K7g7 loss in 2 half-moves
11 K8g7 loss in 2 half-moves
12 Kg6 loss in 2 half-moves
13 Rb2 loss in 2 half-moves
14 Rc2 loss in 2 half-moves
15 Rd2 loss in 2 half-moves
16 Re2 loss in 2 half-moves
17 Rf2 loss in 2 half-moves
18 Rg4 loss in 2 half-moves
19 Rg5 loss in 2 half-moves
20 Rg6 loss in 2 half-moves