| Alvar Alonso | |
| Country: | Spain |
| Birth Date: | 1992 9, df=yes |
| Birth Place: | Figueres, Spain |
| Grandmaster (2013) | |
| Peakrating: | 2572 (March 2021) |
| Fideid: | 2270544 |
Alvar Alonso Rosell (born 13 September 1992 in Figueres, Girona) is a Spanish chess Grandmaster. He is ranked 10th best chess player in Spain.[1]
He was champion of Spain in 2011, surpassing the player Miguel Illescas. Alonso Rosell also won other national championships; he was the 2004 champion of Spain in the U-12, the 2006 champion in U-14, the 2008 and 2009 youth champion of Catalonia, in 2009 champion of Spain in the U-18, and the 2011 runner up in Catalonia behind Marc Narciso. In 2014 he defeated Narciso to become the 2014 Catalonia chess champion.[2]
On 23 December 2018 he won the 5th Sunway Sitges Chess Festival by scoring 8/10, half a point more than strong grandmasters such as Vassily Ivanchuk and Dmitry Andreikin.[3]