Triangular chess refers to a group of chess variants played on boards composed of triangular cells.
The best known is a chess variant for two players, Triangular Chess, invented by George R. Dekle Sr. in 1986.12 Dekle made another variation including fairy pieces which is called Tri-Chess. These two two-player games were included in World Game Review No. 10 edited by Michael Keller.3

Russian Ilshat Tagiev, who introduced a "neutrality rule" to three-player chess in the mid-2000s,45 took out a patent for a three-person variant of triangular chess on a hexagonal board in 2009.6
References
References
- Pritchard (1994), pp. 321–22
- Pritchard (2007), p. 213
- Keller (1991)
- Sohail (2016)
- Interesting Engineering (2017)
- Patent number 86486 – Шахматная игра (Chess game) – Ilshat Tagiev Archived 2018-11-25 at the Wayback Machine (in Russian)
Bibliography
- Interesting Engineering (2017). "Three Player Chess is Just as Crazy As it Sounds". InterestingEngineering.com. Retrieved 25 November 2018. Cited in: [1].
- Keller, Michael, ed. (June 1991). "A Panorama of Chess Variants". World Game Review. No. 10. Michael Keller. ISSN 1041-0546.
- Pritchard, D. B. (1994). The Encyclopedia of Chess Variants. Games & Puzzles Publications. ISBN 0-9524142-0-1.
- Pritchard, D. B. (2007). Beasley, John (ed.). The Classified Encyclopedia of Chess Variants. John Beasley. ISBN 978-0-9555168-0-1.
- Sohail, Umer (2016). "Three Player Chess Is Now A Reality". WonderfulEngineering.com. Retrieved 25 November 2018.