Chess mixed with D&D.
An idea I've thought about from time to time, although not to this extent.
But Chess would have a lot more peril (and cost) if every attack could potentially result in the attacker losing the foray.
I am reminded of Edgar Rice Burrough's Chessmen of Mars, and the swordplay and bloodsport version of chess, which gave each gladiator-like contestant in a "chess" move a personal life-or-death stake in the move.
I also think quite strongly about my "house rules": that a king can, at whim, "trample" and discard and pawns in his escape route, as needed. Makes game logic to me.
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