If you stepped from <BD>g6</BD> to <BD>g5</BD>, the board should look like the one on the left. Notice that the arrow indicator now points at the second player.
The <BD>pawn</BD> at <BD>a2</BD> can either step to <BD>b2</BD> or jump to one of several destinations, for instance: <BD>jump a2-g6</BD>.
