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

EGTB: win in 4 half-moves

# move score
1 Kb1 win in 3 half-moves
2 Kb2 win in 3 half-moves
3 Ra3 win in 3 half-moves
4 Rb3 win in 3 half-moves
5 Ka2 draw
6 Kc4 draw
7 Kd4 draw
8 Ke3 draw
9 Ke4 draw
10 Rc4 draw
11 Kc2 loss in 2 half-moves
12 Kd2 loss in 2 half-moves
13 Ke2 loss in 2 half-moves
14 Rc1 loss in 2 half-moves
15 Rc2 loss in 2 half-moves
16 Rc5 loss in 2 half-moves
17 Rc6 loss in 2 half-moves
18 Rc7 loss in 2 half-moves
19 Rc8 loss in 2 half-moves