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FIDE ID 2278731· born 1934 · last updated 5/12/2026
FIDE standard
1645
FIDE rapid
-
FIDE blitz
-
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Shortlist public Lichess and chess.com accounts for Beekhof Harmsen 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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