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FIDE ID 40131580· born 1948 · last updated 9/24/2026
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Shortlist public Lichess and chess.com accounts for Sijbersma 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 40131580 and do not have usable games for Sijbersma yet. Paste games below to run repertoire matching by play pattern.
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