 Ritchie later lost interest in trading stock options, and left the CBOE, but before he left, he gave his Texas Instrument calculator, which was programmed with the Black-Scholes formula, to Steve Fossett.According to Ritchie, “A trader on the floor with the simplest programming calculators in 1976 instantly became a one-eyed man in the land of the blind.” Fossett made a fortune using this calculator and became the single biggest trader on the floor of the CBOE.Later, in his book "Chasing the Wind", Fossett attributed his success as a trader to Ritchie.