Perhaps Koltanowski's most remarkable accomplishment was that he made his living entirely from chess. He wrote many books; his best-known work is "Adventures of a Chess Master", published by David McKay Co. in 1955. In it, he recounts primarily his tours giving blindfolded simultaneous exhibitions. He also wrote books on the Colle System which he sold by mail order. He taught a system which would enable even rank beginners to get out of the opening with a playable game. This saved his students the trouble of memorizing vast amounts of chess opening theory. However, he never played this opening himself against strong opponents.