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

EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rd3 win in 3 half-moves
3 Rd4 win in 3 half-moves
4 Rd5 win in 3 half-moves
5 Rd6 win in 3 half-moves
6 Ra8 win in 5 half-moves
7 K4b4 draw
8 K4b5 draw
9 K5b4 draw
10 K5b5 draw
11 Ka3 draw
12 Ka6 draw
13 Kb3 draw
14 Kb6 draw
15 Rc8 draw
16 Rd7 draw
17 Re8 draw
18 Rf8 draw
19 Rd1 loss in 2 half-moves
20 Rd2 loss in 2 half-moves
21 Rg8 loss in 2 half-moves
22 Rh8 loss in 2 half-moves