Database: european_football_2
Question: What is the overall rating of the football player Gabriel Tamas in year 2011?
SQL: SELECT t2.overall_rating FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE t1.player_name = 'Gabriel Tamas' AND strftime('%Y', t2.date) = '2011'