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EGTB: win in 4 half-moves

# move score
1 Rg1 win in 3 half-moves
2 Rg3 win in 5 half-moves
3 Ra7 draw
4 Rb7 draw
5 Rc7 draw
6 Rf7 draw
7 Rg2 draw
8 Rg4 draw
9 Rg5 draw
10 Rg6 draw
11 K1b1 loss in 2 half-moves
12 K1b2 loss in 2 half-moves
13 K2b1 loss in 2 half-moves
14 K2b2 loss in 2 half-moves
15 Ka3 loss in 2 half-moves
16 Kb3 loss in 2 half-moves
17 Rd7 loss in 2 half-moves
18 Re7 loss in 2 half-moves
19 Rg8 loss in 2 half-moves
20 Rh7 loss in 2 half-moves