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EGTB: win in 4 half-moves

# move score
1 Rg8 win in 3 half-moves
2 Rg6 win in 5 half-moves
3 K7b7 draw
4 K7b8 draw
5 K8b7 draw
6 K8b8 draw
7 Ra1 draw
8 Rb1 draw
9 Rf1 draw
10 Rg5 draw
11 Rg7 draw
12 Rh1 draw
13 Ka6 loss in 2 half-moves
14 Kb6 loss in 2 half-moves
15 Rc1 loss in 2 half-moves
16 Rd1 loss in 2 half-moves
17 Re1 loss in 2 half-moves
18 Rg2 loss in 2 half-moves
19 Rg3 loss in 2 half-moves
20 Rg4 loss in 2 half-moves