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FIDE ID 1037978· born 1977 · last updated 9/24/2026
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Shortlist public Lichess and chess.com accounts for Mackaaij 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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We checked our stored public PGN sources for FIDE ID 1037978 and do not have usable games for Mackaaij yet. Paste games below to run repertoire matching by play pattern.
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