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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Ra3 draw
3 Rb3 draw
4 Re3 draw
5 Rg4 draw
6 Rg5 draw
7 Rg6 draw
8 Rg8 draw
9 f7 loss in 2 half-moves
10 Rc3 loss in 2 half-moves
11 Rd3 loss in 2 half-moves
12 Rf3 loss in 2 half-moves
13 Rg1 loss in 2 half-moves
14 Rg2 loss in 2 half-moves
15 Rh3 loss in 2 half-moves