Leonid Yudassin is an international grandmaster in chess who been ranked as high as 2650. For those who don’t understand such things, that means he has played Karpov and Kasparov, and lived to tell about it. He has also been chess champion of Israel at one time and of Russia another time. Beyond that he is a man who loves philosophy and has written books albeit in Cyrillic. If you love chess tune in.