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The new 10x10 version of Dice Chess is great Fencer, and as you said when you released it unlike the normal version it cannot be over in 4 moves. Its now much more fun
Thinking along the same lines, Behemoth Chess can be over before you get you SECOND go, how about doing something similar with that ?
Maybe spread the Kings out a bit, as long as there is at least 4 squares between them, so the Behemoth can not wipe you out before you have a chance to move one lol. Maybe 2 kings would work
Just another idea anyway, i like the Behemoth, nice to have a third player as such