Gibraltar's Tradewise Chess

What's the world's strongest annual open chess tournament? I'm not sure how to measure 'strongest', but many say it is Gibraltar's Tradewise Chess Festival.

Tradewise Chess Festival entrevistas y ambiente 25 © Flickr user infogibraltar under Creative Commons.

The caption said, 'El gran maestro y director del evento, Stuart Conquest, junto al cartel anunciador del festival Tradewise', which Google translates as 'The great teacher and event director, Stuart Conquest, next to the poster of the festival Tradewise.' Change 'gran maestro' to granmaestro and we get 'grandmaster and event director, Stuart Conquest'. • For more about the event, won by GM Ivan Cheparinov, see Tradewise Gibraltar Chess 2014.