[ Help | Earliest Comments | Latest Comments ][ List All Subjects of Discussion | Create New Subject of Discussion ][ List Earliest Comments Only For Pages | Games | Rated Pages | Rated Games | Subjects of Discussion ]Single Comment Quantum Chess . Commercial variant with new pieces on 10 by 10 and 12 by 12 boards. (10x10, Cells: 100) [All Comments] [Add Comment or Rating]George Duke wrote on 2004-09-11 UTCWatt and Kapaa's Quantum Chess is based on their US Patent 5511793 issued April 30, 1996, and a (second)7.5-yr. renews it. Webpage has been down before, so it may return, having 10x10 and 12x12 boards. Patent is the longest games patent ever, awkwardly almost 100 pages single-spaced, rivaling recent biochemical patents, about only comparable. Falcon Chess USP5690334, 25.11.97, and Trice's Gothic Chess USP6481716, 19.11.02, both reference it.