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

EGTB: win in 4 half-moves

# move score
1 Rg7 win in 3 half-moves
2 Ra7 draw
3 Rb7 draw
4 Rh7 draw
5 b5 loss in 2 half-moves
6 Rc7 loss in 2 half-moves
7 Rd7 loss in 2 half-moves
8 Re7 loss in 2 half-moves
9 Rf2 loss in 2 half-moves
10 Rf4 loss in 2 half-moves
11 Rf5 loss in 2 half-moves
12 Rf6 loss in 2 half-moves
13 Rf8 loss in 2 half-moves
14 Rf1 loss in 1 half-moves
15 Rf3 loss in 1 half-moves