The white b4 pawn cannot take backwards. The black pawn is checkmating the white king with the king and rook because it covers the e2 square, otherwise it wouldn't be a checkmate
1 year ago(-1)
Sorry, that's the image for the "correct" answer. This is the one I use to indicate that you can't checkmate the black king
1 year ago(+2)
ok but white started at the top of the board so the white pawn doesn't check the king because like iduno999 said the white pawn is advancing downwards