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EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rd8 win in 3 half-moves
3 Ra8 draw
4 Rc8 draw
5 Re8 draw
6 Rf8 draw
7 Rg1 draw
8 Rg3 draw
9 Rg4 draw
10 Rg5 draw
11 K4b5 loss in 2 half-moves
12 K4c5 loss in 2 half-moves
13 K4d5 loss in 2 half-moves
14 K6b5 loss in 2 half-moves
15 K6c5 loss in 2 half-moves
16 K6d5 loss in 2 half-moves
17 Kb3 loss in 2 half-moves
18 Kb4 loss in 2 half-moves
19 Kb6 loss in 2 half-moves
20 Kb7 loss in 2 half-moves
21 Kc3 loss in 2 half-moves
22 Kc7 loss in 2 half-moves
23 Kd3 loss in 2 half-moves
24 Kd4 loss in 2 half-moves
25 Kd6 loss in 2 half-moves
26 Kd7 loss in 2 half-moves
27 Rg2 loss in 2 half-moves
28 Rg6 loss in 2 half-moves
29 Rg7 loss in 2 half-moves
30 Rh8 loss in 2 half-moves