redsales: I am always pining for Alice Chess.

The challenge is a deep one.

Tandem chess is good, as is Hostage Chess. The "Drop Chess" games make for strong initiatives, and the playing field is levelled a bit. Hostage keeps the forces more equal; Tandem Chess forces the opponent who makes mistakes to pay for them in pieces. Hostage Chess keeps all the pieces (possibly) able to be in play. Either would be good--both would be better!