Short won the British Chess Championship in 1984, 1987, and 1998, and the English Championship in 1991 (the only year in which the latter event was held). He was the Commonwealth Champion in 2004 (Mumbai), 2006 (Mumbai) and 2008 (Nagpur). He won the 2006 EU Individual Open Chess Championship in Liverpool and took a share of second place in 2008 when it was held there again. He has finished outright first, or tied for first, in dozens of other international tournaments, including Geneva (1979), Belfort, World Under 16 (1979), the BBC Master Game (1981), Amsterdam OHRA (1982), Baku (1983), Esbjerg (1984), British Rapidplay Chess Championship (1986), Wijk aan Zee (1986, 1987), Reykjavík (1987), Amsterdam VSB (1988, 1991, 1992, 1993), Hastings (1987/88, 1988/89), Pärnu (1996), Groningen (1996), Tallinn/Pärnu (1998), Isle of Man Monarch Assurance 1998, Dhaka United Insurance (1999), Shymkent (1999), Pamplona (1999/2000), Linares Open (2000), Tan Chin Nam Cup, Beijing (2000), Sigeman and Co. Malmö (2002, 2009, 2013 joint first shared with Richárd Rapport and Nils Grandelius), Gibraltar (2003, 2004, 2012), Budapest Hunguest Hotels (2003), Samba Cup, Skanderborg (2003), Taiyuan (2004), the Politiken Cup (2006), Bazna (2008), the Staunton Memorial (2009), Bangkok Chess Club Open (2011, 2012, 2015, 2017), Luanda (2011), 7th Edmonton International (2012), Bunratty (2012, 2016, 2017, 2020), RA Club Ottawa (2012), Pühajärve Rapid Chess Tournament (2012), Spicenet Tanzania Open (2013), PokerStars Isle of Man (2014), Zaw Win Lay Memorial Yangon (2014), the South African Open (2015) the 1st Stars Cup in Anzali (2016), the British Knockout Championship (2016), the Bacolod Negros Open (2017), the Pre-League Blitz Open in Kampala (2018) and the GM Nigel Short Blitz in Lagos (2018).