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EGTB: win in 4 half-moves

# move score
1 Rb3 win in 3 half-moves
2 Ra3 draw
3 Rc3 draw
4 Rd3 draw
5 Re3 draw
6 Rf4 draw
7 Rf6 draw
8 Rf7 draw
9 Rf8 draw
10 g1=B loss in 2 half-moves
11 g1=K loss in 2 half-moves
12 g1=N loss in 2 half-moves
13 g1=Q loss in 2 half-moves
14 g1=R loss in 2 half-moves
15 Rf1 loss in 2 half-moves
16 Rf2 loss in 2 half-moves
17 Rf5 loss in 2 half-moves
18 Rg3 loss in 2 half-moves
19 Rh3 loss in 2 half-moves