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EGTB: win in 4 half-moves

# move score
1 Rg8 win in 3 half-moves
2 Rb2 draw
3 Rb4 draw
4 Rd8 draw
5 Re8 draw
6 Rf8 draw
7 Rh8 draw
8 Kg5 loss in 2 half-moves
9 Kg6 loss in 2 half-moves
10 Kg7 loss in 2 half-moves
11 Kh5 loss in 2 half-moves
12 Kh7 loss in 2 half-moves
13 Ra8 loss in 2 half-moves
14 Rb1 loss in 2 half-moves
15 Rb3 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Rb6 loss in 2 half-moves
18 Rb7 loss in 2 half-moves
19 Rc8 loss in 2 half-moves