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FIDE ID 21043680· born 2005 · last updated 9/24/2026
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Shortlist public Lichess and chess.com accounts for Kostyk 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 21043680 and do not have usable games for Kostyk yet. Paste games below to run repertoire matching by play pattern.
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