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EGTB: win in 4 half-moves

# move score
1 Rg1 win in 3 half-moves
2 Kc1 draw
3 Ra7 draw
4 Re7 draw
5 Rf7 draw
6 Rg3 draw
7 Rg8 draw
8 Rh7 draw
9 Kaa2 loss in 2 half-moves
10 Kab2 loss in 2 half-moves
11 Kba2 loss in 2 half-moves
12 Kbb2 loss in 2 half-moves
13 Kc2 loss in 2 half-moves
14 Rb7 loss in 2 half-moves
15 Rc7 loss in 2 half-moves
16 Rd7 loss in 2 half-moves
17 Rg2 loss in 2 half-moves
18 Rg4 loss in 2 half-moves
19 Rg5 loss in 2 half-moves
20 Rg6 loss in 2 half-moves