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FIDE ID 21098522· born 2009 · last updated 5/12/2026
FIDE standard
1452
FIDE rapid
1489
FIDE blitz
1462
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Shortlist public Lichess and chess.com accounts for Balcerzak 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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