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

EGTB: win in 4 half-moves

# move score
1 Rg8 win in 3 half-moves
2 K6g7 draw
3 K8g7 draw
4 Ra4 draw
5 Rb4 draw
6 Rc4 draw
7 Rg1 draw
8 Rg2 draw
9 Rg3 draw
10 Rg7 draw
11 Kg5 loss in 2 half-moves
12 Kg6 loss in 2 half-moves
13 Kg8 loss in 2 half-moves
14 Kh5 loss in 2 half-moves
15 Rd4 loss in 2 half-moves
16 Re4 loss in 2 half-moves
17 Rf4 loss in 2 half-moves
18 Rg5 loss in 2 half-moves
19 Rg6 loss in 2 half-moves
20 Rh4 loss in 2 half-moves
21 K6h7 loss in 1 half-moves
22 K8h7 loss in 1 half-moves