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EGTB: win in 4 half-moves

# move score
1 Rg6 win in 3 half-moves
2 f6 draw
3 Rb4 draw
4 Rf4 draw
5 Rg7 loss in 6 half-moves
6 Rg8 loss in 6 half-moves
7 Rg3 loss in 4 half-moves
8 Rg5 loss in 4 half-moves
9 Rh4 loss in 4 half-moves
10 Ra4 loss in 2 half-moves
11 Rc4 loss in 2 half-moves
12 Rd4 loss in 2 half-moves
13 Re4 loss in 2 half-moves
14 Rg1 loss in 2 half-moves
15 Rg2 loss in 2 half-moves