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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rh1 win in 3 half-moves
3 Ra2 draw
4 Ra3 draw
5 Ra4 draw
6 Ra7 draw
7 Rb2 draw
8 Rb3 draw
9 Rb4 draw
10 Rb7 draw
11 Rf1 draw
12 Ra5 loss in 2 half-moves
13 Ra6 loss in 2 half-moves
14 Ra8 loss in 2 half-moves
15 Rb5 loss in 2 half-moves
16 Rb6 loss in 2 half-moves
17 Rc1 loss in 2 half-moves
18 Rd1 loss in 2 half-moves
19 Re1 loss in 2 half-moves
20 Rg1 loss in 2 half-moves