private bool MovingTwoRanksForwardFromStartingRank(Square origin, Square destination)
{
return (FromStartingRank(origin)
&& origin.ForwardTo(destination)
&& origin.DistanceOfRanksIsTwoTo(destination)
&& PathIsFree(origin, destination));
}
private bool MovingTwoRanksAndOneFile(Square origin, Square destination)
{
return (origin.DistanceOfRanksIsTwoTo(destination)
&& origin.DistanceOfFilesIsOneTo(destination));
}