Texas Instruments was planning to launch the TI 99/4 personal computer and wanted consultancy support in the design of a chess program. Levy had expertise in chess algorithms and programming opening books and was well qualified to carry out the task. He wrote a detailed specification and over an extended period, involving many visits to Texas, he provided advice to their development group. The program had many original features and the resulting Chess cartridge is believed to be the most successful sold for the TI99/4.