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FIDE ID 5193893· born 1973 · last updated 9/24/2026
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Shortlist public Lichess and chess.com accounts for Fong Ronquillo via fuzzy name, country, and rating-band signals. Fastest path; works without sample games.
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Their repertoire vs yours
Once you have a candidate account, we cross-reference its opening tree against your imported games, surfacing the lines they play that you don’t know, the leaks in their repertoire you can punish, and the gaps in yours you’ll need to plug before the game.
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