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 Kaa4 win in 5 half-moves
3 Kaa6 win in 5 half-moves
4 Kab4 win in 5 half-moves
5 Kab6 win in 5 half-moves
6 Kba4 win in 5 half-moves
7 Kba6 win in 5 half-moves
8 Kbb6 win in 5 half-moves
9 Kc6 win in 5 half-moves
10 Ra8 win in 5 half-moves
11 Kbb4 draw
12 Kc4 draw
13 Kc5 draw
14 Rb7 draw
15 Rf8 draw
16 Rg8 draw
17 Rh8 draw
18 Rc8 loss in 2 half-moves
19 Rd8 loss in 2 half-moves
20 Re8 loss in 2 half-moves