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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rd2 draw
3 Rh2 draw
4 Kf7 loss in 2 half-moves
5 Kf8 loss in 2 half-moves
6 Kg7 loss in 2 half-moves
7 Kh7 loss in 2 half-moves
8 Kh8 loss in 2 half-moves
9 Ra2 loss in 2 half-moves
10 Rb1 loss in 2 half-moves
11 Rb3 loss in 2 half-moves
12 Rb4 loss in 2 half-moves
13 Rb5 loss in 2 half-moves
14 Rb7 loss in 2 half-moves
15 Re2 loss in 2 half-moves
16 Rf2 loss in 2 half-moves
17 Rg2 loss in 2 half-moves
18 Rb6 loss in 1 half-moves
19 Rc2 loss in 1 half-moves