Sorry. I have no idea what you're talking about. I don't play Reversi that much, I like the programing challenge it gives me. For now it only finds current players disks and from them sees in which are possible moves and which disks will be taken over in the process. I would be grateful if you could show me in the direction where these algorithms can be found, or if you would be kind to explain it here on tmo, so others can learn too.