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EGTB: win in 4 half-moves

# move score
1 Rb7 win in 3 half-moves
2 Ra3 draw
3 Rb4 draw
4 Rb5 draw
5 Rb6 draw
6 Rb8 draw
7 Re3 draw
8 Rh3 draw
9 Kb7 loss in 2 half-moves
10 Kb8 loss in 2 half-moves
11 Kc7 loss in 2 half-moves
12 Kd7 loss in 2 half-moves
13 Kd8 loss in 2 half-moves
14 Rb1 loss in 2 half-moves
15 Rb2 loss in 2 half-moves
16 Rc3 loss in 2 half-moves
17 Rd3 loss in 2 half-moves
18 Rf3 loss in 2 half-moves
19 Rg3 loss in 2 half-moves