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EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Rb3 draw
3 Rb5 draw
4 Ra7 loss in 4 half-moves
5 Rh7 loss in 4 half-moves
6 Ke7 loss in 2 half-moves
7 Ke8 loss in 2 half-moves
8 Kf7 loss in 2 half-moves
9 Kg7 loss in 2 half-moves
10 Kg8 loss in 2 half-moves
11 Rb2 loss in 2 half-moves
12 Rb4 loss in 2 half-moves
13 Rb6 loss in 2 half-moves
14 Rb8 loss in 2 half-moves
15 Rc7 loss in 2 half-moves
16 Rd7 loss in 2 half-moves
17 Re7 loss in 2 half-moves
18 Rf7 loss in 2 half-moves
19 Rb1 loss in 1 half-moves