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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 K7b8 draw
3 K8b8 draw
4 Ka6 draw
5 Ra1 draw
6 Rb2 draw
7 Rb3 draw
8 Rb7 draw
9 Rf1 draw
10 K7b7 loss in 2 half-moves
11 K8b7 loss in 2 half-moves
12 Kb6 loss in 2 half-moves
13 Rb4 loss in 2 half-moves
14 Rb5 loss in 2 half-moves
15 Rb6 loss in 2 half-moves
16 Rc1 loss in 2 half-moves
17 Rd1 loss in 2 half-moves
18 Re1 loss in 2 half-moves
19 Rg1 loss in 2 half-moves
20 Rh1 loss in 2 half-moves