or
Loading player profile…
FIDE ID 4507525· born 1941 · last updated 5/12/2026
FIDE standard
1853
FIDE rapid
1891
FIDE blitz
-
Quick name searchFree
Shortlist public Lichess and chess.com accounts for Kostrov via fuzzy name, country, and rating-band signals. Fastest path; works without sample games.
AI matching by sample game
Searching public databases for known games ofKostrov…
Have your own PGNs? You can also paste them below once this finishes; or use Quick name search above to skip this step.
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.
Pick a candidate account above to unlock the report.
AI matching by sample game
We checked our stored public PGN sources for FIDE ID 4507525 and do not have usable games for Kostrov yet. Paste games below to run repertoire matching by play pattern.
AI Scout can surface accounts even when their handle looks nothing like their name; the right game count is benchmarked on /how-it-works.