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FIDE ID 6424090· born 1997 · last updated 9/24/2026
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Shortlist public Lichess and chess.com accounts for Fermin Castillo via fuzzy name, country, and rating-band signals. Fastest path; works without sample games.
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Prep report
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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AI matching by sample game
We checked our stored public PGN sources for FIDE ID 6424090 and do not have usable games for Fermin Castillo yet. Paste games below to run repertoire matching by play pattern.
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