or
Loading player profile…
FIDE ID 8410160 · born 1983 · last updated 5/12/2026
Standard
1533
Rapid
1657
Blitz
1602
Quick name search
Shortlist public Lichess and chess.com accounts for Sierra 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 of Sierra…
Have your own PGNs? You can also paste them below once this finishes; or use Quick name search above to skip this step.
Real tournament games of Guillermo Sierra from public sources. Select a game to replay it on the board.
All games
+2 =1 -4 · score 36% · 7 games
As White
+1 =1 -1 · score 50% · 3 games
As Black
+1 =0 -3 · score 25% · 4 games
Rosas Valdes,Javier Alfonso(1039)
Sierra,Guillermo(1394)1-0
Loading the game…
Select a game
As White
As Black
| Event | Games | Dates |
|---|---|---|
| 9th ch-Iberoamericano | 7 | 2023-11-26 to 2023-12-02 |
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 from found games
We already found 7 of Sierra’s real games in public databases. No PGNs needed: one click shortlists public accounts with similar opening choices.
Sources: twic (7) - latest 12/2/2023
Helps match accounts whose display name is not written in Latin letters.
Costs 1 credit
Uses 1 credit. Results take a few minutes; the results page updates itself.