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FIDE ID 6540406· born 1980 · last updated 9/24/2026
Search for the accounts Sergio A Guillen Fernandez plays online, then open one to see its openings and practice the lines.
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No tournament games of Sergio A Guillen Fernandez are on file yet, so this search uses their name, country and rating. Adding their games under More options makes it stronger.
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Search for Sergio A Guillen Fernandez's online accounts first. Then open one to see the openings it plays, move by move, and practice the positions.