This isn't the one that I'm looking for, what I mean is that any chess player can play and do a PVP style of game but to join a matchmaking, they need to put a certain amount for example, you and me will each put a 0.005 btc and the total pool would be 0.01 and whoever wins between us will be getting the pot and Coinplay isn't that, it's just betting on professionals and grandmasters.
I remember seeing a discussion about it and I also remember reading that this type of chess gambling could become a cheater's den, what I mean about it is that people will open two games, one with another person and the other is with AI and whatever move their opponent(the person) makes they'll copy it and use it against the AI and whatever move the AI made against it will be used against their opponent. basically, their opponent will be fighting against an AI.