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EGTB: win in 4 half-moves

# move score
1 Rf8 win in 3 half-moves
2 Rf6 win in 5 half-moves
3 Ra2 draw
4 Rb2 draw
5 Rc2 draw
6 Rd2 draw
7 Rf3 draw
8 Rf4 draw
9 Rf5 draw
10 Rf7 draw
11 K7b7 loss in 2 half-moves
12 K7b8 loss in 2 half-moves
13 K8b7 loss in 2 half-moves
14 K8b8 loss in 2 half-moves
15 Ka6 loss in 2 half-moves
16 Kb6 loss in 2 half-moves
17 Re2 loss in 2 half-moves
18 Rf1 loss in 2 half-moves
19 Rg2 loss in 2 half-moves
20 Rh2 loss in 2 half-moves