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EGTB: win in 4 half-moves

# move score
1 Rg6 win in 3 half-moves
2 K6g7 draw
3 K7g7 draw
4 Kg8 draw
5 Kh5 draw
6 Kh8 draw
7 Ra6 draw
8 Rb2 draw
9 Rb7 draw
10 Rb8 draw
11 Rc6 draw
12 K6g6 loss in 2 half-moves
13 K7g6 loss in 2 half-moves
14 Kg5 loss in 2 half-moves
15 Rb1 loss in 2 half-moves
16 Rb3 loss in 2 half-moves
17 Rb4 loss in 2 half-moves
18 Rb5 loss in 2 half-moves
19 Rd6 loss in 2 half-moves
20 Re6 loss in 2 half-moves
21 Rf6 loss in 2 half-moves