 Although many reference books refer to his death date as August 12, 1909, the Washington "Post" for that morning contained an August 11 dispatch of his death.The Trenton (N.J.) "Evening Times" of August 11, 1909, reported "The body of M. Swiderski, the noted chess player, who committed suicide on August 2 was found today in the room where he had poisoned himself and then fired a bullet into this head.The body was badly decomposed.