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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rc8 draw
3 Rd8 draw
4 Rf2 draw
5 Rf3 draw
6 Rf7 draw
7 Ra8 loss in 4 half-moves
8 Ka3 loss in 2 half-moves
9 Ka5 loss in 2 half-moves
10 Kb3 loss in 2 half-moves
11 Kb4 loss in 2 half-moves
12 Kb5 loss in 2 half-moves
13 Re8 loss in 2 half-moves
14 Rf1 loss in 2 half-moves
15 Rf4 loss in 2 half-moves
16 Rf5 loss in 2 half-moves
17 Rf6 loss in 2 half-moves
18 Rg8 loss in 2 half-moves
19 Rh8 loss in 2 half-moves