Shogi has given inspiration for a number of chess variants centered on the drop capability. Curiously, I have yet to find compositions for such variations. I may not be looking deep enough, but in this article I intend to propose a way to compose problems with drops.

As mentioned, one of shogi's most well-known feature is the ability to return a captured piece by placing it onto the field of play, this drop move being a move in itself. Putting drops in western Chess has been tried, with Chessgi and Crazyhouse being the main forms taking a direct borrowing of the capture-and-drop aspect, though they cannot readily be played on-the-board. Another well-known variant is Hostage Chess where equipment limitations made use of an exchange mechanism to allow drops without any piece changing color.

Taking cues from Japanese tsumeshogi, this proposal is for a form of directmate problem with conditions as follows:

1. Every move by White must be a check

2. If a variant is named(e.g. Chessgi, Crazyhouse), it is implied Black has possession of every other piece not under White's control. In any other case the composer must make an account of every piece in play.

3. The mating position must leave White without any pieces left to drop.

4. Black cannot simply drop a piece to delay an inevitable mate, i.e. an interfering drop that the mating side can capture with no effect to the mate.