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EGTB: win in 4 half-moves

# move score
1 Rg8 win in 3 half-moves
2 R6b7 draw
3 R8b7 draw
4 Ra6 draw
5 Ra8 draw
6 Rb1 draw
7 Rb5 draw
8 Rg6 draw
9 Rb2 loss in 2 half-moves
10 Rb3 loss in 2 half-moves
11 Rb4 loss in 2 half-moves
12 Rc6 loss in 2 half-moves
13 Rc8 loss in 2 half-moves
14 Rd6 loss in 2 half-moves
15 Rd8 loss in 2 half-moves
16 Re6 loss in 2 half-moves
17 Re8 loss in 2 half-moves
18 Rf6 loss in 2 half-moves
19 Rf8 loss in 2 half-moves
20 Rh6 loss in 2 half-moves
21 Rh8 loss in 2 half-moves