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FIDE ID 42123526· born 2009 · last updated 9/24/2026
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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 42123526 and do not have usable games for Efstathopoulos yet. Paste games below to run repertoire matching by play pattern.
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