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FIDE ID 343459102· born 1956 · last updated 5/12/2026
FIDE standard
1797
FIDE rapid
1891
FIDE blitz
1523
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Shortlist public Lichess and chess.com accounts for De Rooij 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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