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EGTB: win in 4 half-moves

# move score
1 Rb1 win in 3 half-moves
2 g1=N draw
3 Ra6 draw
4 Rb5 draw
5 Rc6 draw
6 Rd6 draw
7 Re6 draw
8 g1=B loss in 2 half-moves
9 g1=K loss in 2 half-moves
10 g1=Q loss in 2 half-moves
11 g1=R loss in 2 half-moves
12 Rb2 loss in 2 half-moves
13 Rb3 loss in 2 half-moves
14 Rb4 loss in 2 half-moves
15 Rb7 loss in 2 half-moves
16 Rb8 loss in 2 half-moves
17 Rf6 loss in 2 half-moves
18 Rg6 loss in 2 half-moves
19 Rh6 loss in 2 half-moves