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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 K6a7 draw
3 K8a7 draw
4 Ka5 draw
5 Kb8 draw
6 Ra3 draw
7 Rb1 draw
8 Rb2 draw
9 Rb7 draw
10 Rh3 draw
11 K6b7 loss in 2 half-moves
12 K8b7 loss in 2 half-moves
13 Kb5 loss in 2 half-moves
14 Kb6 loss in 2 half-moves
15 Rb4 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Rb6 loss in 2 half-moves
18 Rc3 loss in 2 half-moves
19 Rd3 loss in 2 half-moves
20 Re3 loss in 2 half-moves
21 Rf3 loss in 2 half-moves
22 Rg3 loss in 2 half-moves