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OK, that is interesting, because at the moment the Diagram also has a limitation that it cannot handle more than a single locust victim or unloaded pieces. That is a limitation I was hoping to remove in the future, though. (The Lion Dog of the large Shogi variants can make up to two locust captures, in addition to a normal one.)

Just an idea: wouldn't it be possible to have a move generator generating the move strings for all pseudo-legal moves in the Pre-Move code, and have it do a string compare for each of those with thismove, to see if one matches? If there is one, it can just allow the entire move sequence to be performed without ever having to look at the origin or dest of any of the individual moves. The Post-Move code then would only have to test whether this left the King in check. For this it would basically run the same move generator for the opponent, except that it did not generate strings to compare, but tests whether any of the moves captures the King.