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Here the white pawn may move one square forward or capture
the rook. The black pawns cannot move.
On its first move, the pawn may go two squares straight forward
if the player wishes (and the two squares ahead are vacant).
There are 2 more special kinds of pawn move: the capture en
passant, and pawn promotion.
Suppose that one of your pawns is on its starting square, and
there is an enemy pawn ready to capture it if it moves one square
forward. The rules state that even if your pawn goes two squares
forward, the opposing pawn may still capture it on the next move
(but not later), just as if it had only advanced one square.
