Click on the third or sixth rank to set the en passant target square.

EGTB: win in 4 half-moves

# move score
1 Rb6 win in 3 half-moves
2 K6b7 draw
3 K7b7 draw
4 Ka5 draw
5 Ka8 draw
6 Kb8 draw
7 Rf6 draw
8 Rg2 draw
9 Rg7 draw
10 Rg8 draw
11 Rh6 draw
12 K6b6 loss in 2 half-moves
13 K7b6 loss in 2 half-moves
14 Kb5 loss in 2 half-moves
15 Rc6 loss in 2 half-moves
16 Rd6 loss in 2 half-moves
17 Re6 loss in 2 half-moves
18 Rg1 loss in 2 half-moves
19 Rg3 loss in 2 half-moves
20 Rg4 loss in 2 half-moves
21 Rg5 loss in 2 half-moves