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

EGTB: win in 4 half-moves

# move score
1 Ra8 win in 3 half-moves
2 f8=K draw
3 f8=N draw
4 Ra5 draw
5 Ra6 draw
6 Ra7 draw
7 Rb4 draw
8 Rc4 draw
9 Rd4 draw
10 Rh4 draw
11 f8=B loss in 2 half-moves
12 f8=Q loss in 2 half-moves
13 f8=R loss in 2 half-moves
14 Ra1 loss in 2 half-moves
15 Ra2 loss in 2 half-moves
16 Ra3 loss in 2 half-moves
17 Re4 loss in 2 half-moves
18 Rf4 loss in 2 half-moves
19 Rg4 loss in 2 half-moves