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 Ka3 draw
3 Ka5 draw
4 Ka7 draw
5 Kb3 draw
6 Kb4 draw
7 Kb5 draw
8 Kb7 draw
9 Kb8 draw
10 Rc1 draw
11 Rd8 draw
12 Rh8 draw
13 Rc2 loss in 2 half-moves
14 Rc3 loss in 2 half-moves
15 Rc4 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 Re8 loss in 2 half-moves
20 Rf8 loss in 2 half-moves
21 Rg8 loss in 2 half-moves