An incorrect diagram was run with yesterday's Chess column. At left is the correct diagram. Solution to today's problem by T. Kardos (White: Kh4,Qb3,Rd5,Nf3,Nh5 ...

Italian researchers suspect the hand-drawn chess diagrams discovered in the only-known copy of “De Ludo Scacchorum” were done by Leonardo da Vinci, La Repubblica reported this week.