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EGTB: win in 4 half-moves

# move score
1 Rb6 win in 3 half-moves
2 Ka3 draw
3 Ka6 draw
4 Kb6 draw
5 Ra8 draw
6 Rb1 draw
7 Rb5 draw
8 Rb7 draw
9 Rf8 draw
10 K4b4 loss in 2 half-moves
11 K4b5 loss in 2 half-moves
12 K5b4 loss in 2 half-moves
13 K5b5 loss in 2 half-moves
14 Kb3 loss in 2 half-moves
15 Rb2 loss in 2 half-moves
16 Rb3 loss in 2 half-moves
17 Rb4 loss in 2 half-moves
18 Rc8 loss in 2 half-moves
19 Rd8 loss in 2 half-moves
20 Re8 loss in 2 half-moves
21 Rg8 loss in 2 half-moves
22 Rh8 loss in 2 half-moves