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FIDE ID 6504140 · born 1975 · last updated 5/12/2026
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Shortlist public Lichess and chess.com accounts for Sierra Fonseca via fuzzy name, country, and rating-band signals. Fastest path; works without sample games.
AI matching by sample game
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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 6504140 and do not have usable games for Sierra Fonseca yet. Paste games below to run repertoire matching by play pattern.
AI Scout can surface accounts even when their handle looks nothing like their name; the right game count is benchmarked on /benchmarks.