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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 f8=K draw
3 f8=N draw
4 Ra5 draw
5 Rb4 draw
6 Rb6 draw
7 Rb7 draw
8 Rc5 draw
9 Rh5 draw
10 f8=B loss in 2 half-moves
11 f8=Q loss in 2 half-moves
12 f8=R loss in 2 half-moves
13 Rb1 loss in 2 half-moves
14 Rb2 loss in 2 half-moves
15 Rb3 loss in 2 half-moves
16 Rd5 loss in 2 half-moves
17 Re5 loss in 2 half-moves
18 Rf5 loss in 2 half-moves
19 Rg5 loss in 2 half-moves