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

EGTB: draw

# move score
1 Rb8 draw
2 Rc8 draw
3 Rd8 draw
4 Re8 draw
5 Rf8 draw
6 Nf1 loss in 2 half-moves
7 Nf3 loss in 2 half-moves
8 Ng4 loss in 2 half-moves
9 Ra8 loss in 1 half-moves
10 Rh8 loss in 1 half-moves