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From what I have read and understood so far, the advantage for us chess players shouldn't be that significant ... amazing game nevertheless. :)

Yes and no. Advantages of knowing the moves and being better able to pick your battles. But your x move checkmates will not work in Ragnarok due to the elemental system. TLDR, Some NFTs have weaknesses to other types of NFTs. If you need to take a piece for a checkmate but you are weak vs that piece you will need to change your strategy.

EDIT: And there are only 10 pieces in this game, the alignment is novel.