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

EGTB: win in 2 half-moves

# move score
1 Rb2 win in 1 half-moves
2 Rb6 win in 1 half-moves
3 Rb7 win in 1 half-moves
4 Rb8 win in 1 half-moves
5 f4 loss in 2 half-moves
6 Ra4 loss in 1 half-moves
7 Rb1 loss in 1 half-moves
8 Rb3 loss in 1 half-moves
9 Rb5 loss in 1 half-moves