@nohugs_cake
You might be right, but I have my serious doubts the author agrees with you. In one of the sumplementary parts of the manga ( I think it is here in mangadex ), he said that, in his experience in the shogi world, while some particularly gifted amateurs ( aka geniuses in shogi that ,due to having a professional life out of shogi, couldn't devote their full attention to it ) could brush shoulders with the average professional player, pretty much every player that is even remotely near of the top of his bracket ( and it is clear that Rei is in there ) was putting the type of focus on studying shogi as we see from Rei and others ( in fact I do not recall any of the professional players in this manga being shown to be displicent on their studies ) and that the ones in the top were really geniuses that worked hard. So , based on that, I assume that he would say that Rei is actually the real deal and not what our ex-genius-prince is implying.