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

EGTB: win in 1 half-moves

# move score
1 Rxb3 win in 45 half-moves
2 K2xb3 loss in 2 half-moves
3 K3xb3 loss in 2 half-moves
4 Rxf6 loss in 1 half-moves