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

EGTB: win in 1 half-moves

# move score
1 Rxb4 win in 41 half-moves
2 K3xb4 loss in 2 half-moves
3 K5xb4 loss in 2 half-moves
4 Rxg7 loss in 2 half-moves