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

EGTB: win in 4 half-moves

# move score
1 Re1 win in 3 half-moves
2 Rf4 draw
3 Rf5 draw
4 Rf6 draw
5 Rf8 draw
6 Ka1 loss in 2 half-moves
7 Ka3 loss in 2 half-moves
8 Kb1 loss in 2 half-moves
9 Kb2 loss in 2 half-moves
10 Kb3 loss in 2 half-moves
11 Kc1 loss in 2 half-moves
12 Kc2 loss in 2 half-moves
13 Kd2 loss in 2 half-moves
14 Ke1 loss in 2 half-moves
15 Ke2 loss in 2 half-moves
16 Rf2 loss in 2 half-moves
17 Rf3 loss in 2 half-moves
18 Rf7 loss in 2 half-moves
19 Rg1 loss in 2 half-moves
20 Rh1 loss in 2 half-moves