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EGTB: win in 4 half-moves

# move score
1 Rb6 win in 3 half-moves
2 Ra7 draw
3 Ra8 draw
4 Rbb7 draw
5 Rc7 draw
6 Rc8 draw
7 Rg1 draw
8 Rg5 draw
9 Rg6 draw
10 Rgb7 draw
11 Rgg8 draw
12 Rb1 loss in 2 half-moves
13 Rb2 loss in 2 half-moves
14 Rb3 loss in 2 half-moves
15 Rb4 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Rbg8 loss in 2 half-moves
18 Rd7 loss in 2 half-moves
19 Rd8 loss in 2 half-moves
20 Re7 loss in 2 half-moves
21 Re8 loss in 2 half-moves
22 Rf7 loss in 2 half-moves
23 Rf8 loss in 2 half-moves
24 Rg2 loss in 2 half-moves
25 Rg3 loss in 2 half-moves
26 Rg4 loss in 2 half-moves
27 Rh7 loss in 2 half-moves
28 Rh8 loss in 2 half-moves