Chess is a closed system. Alien beings could be "playing checkers", so to speak. A biology completely different to anything existing on Earth (say, inteligent l

Chess is a closed system. Alien beings could be "playing checkers", so to speak. A biology completely different to anything existing on Earth (say, inteligent life living in the astmophere of a hot gas giant planet) would likely lead an utterly incompatible psychology. It's kind of like in the famous Wittgenstein quote: "if a lion could speak, we could not understand him". Well, lion is an Earth animal, but you see the point.