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

EGTB: win in 4 half-moves

# move score
1 Kb4 win in 3 half-moves
2 Kb5 win in 3 half-moves
3 Kd4 win in 3 half-moves
4 Kd5 win in 3 half-moves
5 Rd2 win in 3 half-moves
6 Kc1 win in 7 half-moves
7 Kc4 win in 7 half-moves
8 Ke1 win in 7 half-moves
9 Ra2 win in 7 half-moves
10 Rb2 win in 7 half-moves
11 Re2 win in 7 half-moves
12 Kd2 win in 13 half-moves
13 Rc1 win in 13 half-moves
14 Ke2 win in 19 half-moves
15 Kb6 draw
16 Kc6 draw
17 Kd6 draw
18 Rc3 draw
19 Rf2 draw
20 Rc4 loss in 2 half-moves
21 Rg2 loss in 2 half-moves
22 Rh2 loss in 2 half-moves