On the CheckersSide, a PawnDrop is a vacant DarkSquare? on the seventh rank which is unguarded by opposing NormalCheckers or other ChessPieces.
On the ChessSide, a PawnDrop is two adjacent vacant squares on the seventh rank.
A PawnDrop is useful for (unsurprisingly) dropping a ChessPawn into, as it threatens immediate promotion, usually followed by some degree of havoc.
NormalCheckers are useful for plugging PawnDrop s (defensively). On the CheckersSide, there are frequently better methods of dealing with them available, however, especially as there are far better things to do with a NormalChecker in hand. No! Not like that! ;->