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EGTB: win in 4 half-moves

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