Reply To: Chess Invented By… Home › Forums › Decaffeinated Coffee › Chess Invented By… › Reply To: Chess Invented By… July 29, 2010 3:27 pm at 3:27 pm #922988 squeakParticipant Oy. We used to look to our Rishonim for elucidation of Shach Taz. I never thought we’d be looking to them for Shach Mat.