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

EGTB: win in 4 half-moves

# move score
1 Kab7 win in 3 half-moves
2 Kbb7 win in 3 half-moves
3 Rb7 win in 3 half-moves
4 Kaa5 draw
5 Kaa7 draw
6 Kab5 draw
7 Kbb5 draw
8 Ra8 draw
9 Rd8 draw
10 Kba5 loss in 2 half-moves
11 Kba7 loss in 2 half-moves
12 Kc5 loss in 2 half-moves
13 Kc6 loss in 2 half-moves
14 Kc7 loss in 2 half-moves
15 Rc8 loss in 2 half-moves
16 Re8 loss in 2 half-moves
17 Rf8 loss in 2 half-moves
18 Rg8 loss in 2 half-moves
19 Rh8 loss in 2 half-moves