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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Rb3 draw
3 Rd3 draw
4 Rg4 draw
5 Rg5 draw
6 Rg6 draw
7 Rg8 draw
8 Rh3 draw
9 Ke7 loss in 2 half-moves
10 Ke8 loss in 2 half-moves
11 Kf7 loss in 2 half-moves
12 Kg7 loss in 2 half-moves
13 Kg8 loss in 2 half-moves
14 Ra3 loss in 2 half-moves
15 Rc3 loss in 2 half-moves
16 Re3 loss in 2 half-moves
17 Rf3 loss in 2 half-moves
18 Rg1 loss in 2 half-moves
19 Rg2 loss in 2 half-moves