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

EGTB: win in 2 half-moves

# move score
1 Ra1 win in 1 half-moves
2 Kb4 loss in 8 half-moves
3 Ka6 loss in 2 half-moves
4 Kb5 loss in 2 half-moves
5 Kb6 loss in 2 half-moves
6 Ra2 loss in 2 half-moves
7 Ra3 loss in 2 half-moves
8 Rb4 loss in 2 half-moves
9 Rc4 loss in 2 half-moves
10 Rd4 loss in 2 half-moves
11 Re4 loss in 1 half-moves
12 Rf4 loss in 1 half-moves
13 Rg4 loss in 1 half-moves
14 Rh4 loss in 1 half-moves