private bool MovingSingleRankForward(Square origin, Square destination)
{
return (origin.ForwardTo(destination)
&& origin.DistanceOfRanksIsOneTo(destination)
&& destination.Color == PieceColor.Empty);
}
private bool MovingTwoRanksForwardFromStartingRank(Square origin, Square destination)
{
return (FromStartingRank(origin)
&& origin.ForwardTo(destination)
&& origin.DistanceOfRanksIsTwoTo(destination)
&& PathIsFree(origin, destination));
}