Answers.Body: <blockquote>
    <p>Could we assume that Gilberto Guerrero is actually Hernandez Guerrero,
    Gilberto?</p>
  </blockquote>
  
  <p>We could but we would very likely be wrong.</p>
  
  <p>First a word on how FIDE allocates FIDE numbers. FIDE doesn't allocate individual numbers to players. Instead it allocates ranges of numbers to individual federations. </p>
  
  <p><a href="https://ratings.fide.com/card.phtml?event=2012707" rel="nofollow noreferrer">Gilbert Guerrero</a>'s FIDE number is 2012707 and was allocated by the US federation.<br>
  <a href="https://ratings.fide.com/card.phtml?event=5100011" rel="nofollow noreferrer">Gilberto Hernandez Guerrero's</a> FIDE number is 5100011 and was allocated by the Mexico federation.</p>
  
  <p>For that to happen the same player would need to have registered with each federation resulting in one player with two FINs. Now that did happen in the early days and so is a possibility but is unlikely.</p>
  
  <p>According to his <a href="https://www.olimpbase.org/Elo/player/Guerrero,%20Gilbert.html" rel="nofollow noreferrer">Olimpbase records</a> Gilbert Guerrero's only FIDE rated games were 12 games played in the second half of 1996 which gave him a rating of 2500. </p>
  
  <p>Checking the Olimpbase data for 1997 for other players called Guerrero we see only one other, a Spanish player called Manuel Gomez Guerrero. He also has FIN 2207893, which is different from Gilberto Hernandez Guerrero, who has FIN 5100011, so not the same player.</p>
  
  <p>The next step is to find, from Gilberto Hernandez Guerrero's FIDE profile what the details are for his earliest recorded result in FIDE's published data. To do that, in <a href="https://ratings.fide.com/card.phtml?event=5100011" rel="nofollow noreferrer">his profile</a>, click on "Click to view All previous periods" under "Individual Calculations". There scroll to the bottom to see that there is an <a href="https://ratings.fide.com/individual_calculations.phtml?idnumber=5100011&amp;rating_period=2001-07-01&amp;t=0" rel="nofollow noreferrer">entry for July 2001</a>. Clicking on that we see that the entry is for "Hernandez, Gilberto".</p>
  
  <p>There are two possibilities here.</p>
  
  <ol>
  <li>He changed his name some time since 2001</li>
  <li>There are two players with different names but the Mexican federation re-used the FIN when one of the players died. By the way, the English Chess Federation did this with Tony Miles' FIN when he died! So, it can happen even with great players.</li>
  </ol>
  
  <p>OK, back to the Olimpbase files to check on Hernandez, Gilberto. The <a href="https://www.olimpbase.org/Elo/player/Hernandez,%20Gilberto.html" rel="nofollow noreferrer">Olimpbase records</a> for this player go back to 1987 and the FIN is 5100011, the same as Gilberto Hernandez Guerrero.</p>
  
  <p>Are Gilberto Hernandez Guerrero and Gilberto Hernandez the same player? Probably. They are the same federation. Maybe he did change or correct his name just before <a href="https://ratings.fide.com/individual_calculations.phtml?idnumber=5100011&amp;rating_period=2006-07-01&amp;t=0" rel="nofollow noreferrer">July 2006</a>. The ratings match up before and after with no big jump. Furthermore it is very unlikely that a GM had a change of FIN like that in 2006. </p>
  
  <p>Regarding the Campora game, here are <a href="https://www.olimpbase.org/Elo/player/Campora,%20Daniel%20H..html" rel="nofollow noreferrer">his olimpbase records</a>. He was 2543 in the July 1999 list and 2534 in the Jan 2000 list. Even playing blitz blindfold and drunk he would not have made those moves.</p>
  
  <p>Apropos the reuse of Tony Miles' FIN. From <a href="https://www.olimpbase.org/Elo/player/Miles,%20Anthony%20J..html" rel="nofollow noreferrer">his Olimpbase records</a> you can see that his FIN was 403385. Today the player with that FIN is <a href="http://ratings.fide.com/card.phtml?event=403385" rel="nofollow noreferrer">Andrew F Footner</a>. Check his rating history and see that apparently he had <a href="http://ratings.fide.com/individual_calculations.phtml?idnumber=403385&amp;rating_period=2001-10-01&amp;t=0" rel="nofollow noreferrer">results in the October 2001 list</a>. Except the player listed is Tony Miles! There are no more results until <a href="http://ratings.fide.com/individual_calculations.phtml?idnumber=403385&amp;rating_period=2007-01-01&amp;t=0" rel="nofollow noreferrer">January 2007</a> which are for Andrew F Footner.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-20T15:49:39.207Z
Answers.Text: Thanks! Your answer reinforces my conviction that they are the same players :)! A possible explanation could be that he played in the US in 1997 and that an organizer misspelled his name from Gilberto to Gilbert and registered him as a new player. The organizer then sent the results to FIDE, who created a new player identification. It wouldn't be the first time that a player has two different FINs!
Answers.UserDisplayName: Kortchnoi
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-20T16:09:33.623Z
Answers.Text: @Kortchnoi Could be. There was much confusion in the 90's regarding FINs. There is much dirty data as a result. There is far less dirty FIDE data today but even in the current FIDE list there are obvious errors.
Answers.UserDisplayName: Brian Towers
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-20T11:43:13.520Z
Answers.LastActivityDate: 2020-04-20T14:39:02.907Z
Answers.LastEditDate: 2020-04-20T14:39:02.907Z
Answers.UserDisplayName: Brian Towers
Body: <p>According to the FIDE website, <a href="https://ratings.fide.com/card.phtml?event=2012707" rel="nofollow noreferrer">Gilbert Guerrero</a> is from the US federation and 2500 Elo. I have never heard of this player, who mates GM Campora in ... 11 moves! </p>
  
  <p>Here is the game from <a href="https://www.chessgames.com/perl/chessgame?gid=1608743" rel="nofollow noreferrer">Chessgames.com</a></p>
  
  <pre><code>[Title "Gilbert Guerrero vs Daniel Hugo Campora, Lima 1999"]
  [FEN ""]
  
  1.e4 Nf6 2.e5 Nd5 3.Bc4 e6 4.d4 Nc6 5.Nf3 Be7 6.O-O O-O 7.Bd3 d6 8.Qe2 dxe5 9.Qe4?? (9.dxe5+=) Nf6?? (9...f5!-+ 10.Qe2 e4) 10.Qh4 Nd7?? (10...exd4! 11. Bg5 g6-+) 11.Qxh7#1-0
  </code></pre>
  
  <ol>
  <li>Could we assume that Gilberto Guerrero is actually <a href="https://ratings.fide.com/card.phtml?event=5100011" rel="nofollow noreferrer">Hernandez Guerrero, Gilberto</a>? Here is his <a href="https://en.wikipedia.org/wiki/Gilberto_Hern%C3%A1ndez_Guerrero" rel="nofollow noreferrer">Wikipedia page</a>.</li>
  <li>Did Hernandez Guerrero, Gilberto ever play for the US?</li>
  <li>Has the game been played in classical time control? This game looks like a joke!</li>
  </ol>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-04-19T21:36:26.453Z
Comments.Text: This looks like someone has entered the moves incorrectly into the database. That has happened to one of my own games and you see this now and then.
Comments.UserDisplayName: postnubilaphoebus
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-04-19T21:49:15.320Z
Comments.Text: That's a reasonable assumption but the guy who entered the moves messed up badly because Campora was 2553 in January 1999!
Comments.UserDisplayName: Kortchnoi
Tags: <history><famous-players><master-games>
Title: Is Gilbert Guerrero a 2500 US player?
ThreadText: # Is Gilbert Guerrero a 2500 US player?
  
  (Asked by: username_0 on 2020-04-19)
  
  According to the FIDE website, Gilbert Guerrero is from the US federation and 2500 Elo. I have never heard of this player, who mates GM Campora in ... 11 moves! 
  Here is the game from Chessgames.com
  [Title "Gilbert Guerrero vs Daniel Hugo Campora, Lima 1999"]
  [FEN ""]
  
  1.e4 Nf6 2.e5 Nd5 3.Bc4 e6 4.d4 Nc6 5.Nf3 Be7 6.O-O O-O 7.Bd3 d6 8.Qe2 dxe5 9.Qe4?? (9.dxe5+=) Nf6?? (9...f5!-+ 10.Qe2 e4) 10.Qh4 Nd7?? (10...exd4! 11. Bg5 g6-+) 11.Qxh7#1-0
  
  
  Could we assume that Gilberto Guerrero is actually Hernandez Guerrero, Gilberto? Here is his Wikipedia page.
  Did Hernandez Guerrero, Gilberto ever play for the US?
  Has the game been played in classical time control? This game looks like a joke!
  
  **Tags:** history, famous-players, master-games
  
  > **Comments:**
  > **username_1**: This looks like someone has entered the moves incorrectly into the database. That has happened to one of my own games and you see this now and then.  
  > **username_0**: That's a reasonable assumption but the guy who entered the moves messed up badly because Campora was 2553 in January 1999!  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2020-04-20. Score: 2 | Accepted answer
  
  > Could we assume that Gilberto Guerrero is actually Hernandez Guerrero,
  > Gilberto?
  
  We could but we would very likely be wrong.
  
  First a word on how FIDE allocates FIDE numbers. FIDE doesn't allocate individual numbers to players. Instead it allocates ranges of numbers to individual federations.
  
  [Gilbert Guerrero](https://ratings.fide.com/card.phtml?event=2012707)'s FIDE number is 2012707 and was allocated by the US federation.  
  [Gilberto Hernandez Guerrero's](https://ratings.fide.com/card.phtml?event=5100011) FIDE number is 5100011 and was allocated by the Mexico federation.
  
  For that to happen the same player would need to have registered with each federation resulting in one player with two FINs. Now that did happen in the early days and so is a possibility but is unlikely.
  
  According to his [Olimpbase records](https://www.olimpbase.org/Elo/player/Guerrero,%20Gilbert.html) Gilbert Guerrero's only FIDE rated games were 12 games played in the second half of 1996 which gave him a rating of 2500.
  
  Checking the Olimpbase data for 1997 for other players called Guerrero we see only one other, a Spanish player called Manuel Gomez Guerrero. He also has FIN 2207893, which is different from Gilberto Hernandez Guerrero, who has FIN 5100011, so not the same player.
  
  The next step is to find, from Gilberto Hernandez Guerrero's FIDE profile what the details are for his earliest recorded result in FIDE's published data. To do that, in [his profile](https://ratings.fide.com/card.phtml?event=5100011), click on "Click to view All previous periods" under "Individual Calculations". There scroll to the bottom to see that there is an [entry for July 2001](https://ratings.fide.com/individual_calculations.phtml?idnumber=5100011&rating_period=2001-07-01&t=0). Clicking on that we see that the entry is for "Hernandez, Gilberto".
  
  There are two possibilities here.
  
  1. He changed his name some time since 2001
  2. There are two players with different names but the Mexican federation re-used the FIN when one of the players died. By the way, the English Chess Federation did this with Tony Miles' FIN when he died! So, it can happen even with great players.
  
  OK, back to the Olimpbase files to check on Hernandez, Gilberto. The [Olimpbase records](https://www.olimpbase.org/Elo/player/Hernandez,%20Gilberto.html) for this player go back to 1987 and the FIN is 5100011, the same as Gilberto Hernandez Guerrero.
  
  Are Gilberto Hernandez Guerrero and Gilberto Hernandez the same player? Probably. They are the same federation. Maybe he did change or correct his name just before [July 2006](https://ratings.fide.com/individual_calculations.phtml?idnumber=5100011&rating_period=2006-07-01&t=0). The ratings match up before and after with no big jump. Furthermore it is very unlikely that a GM had a change of FIN like that in 2006.
  
  Regarding the Campora game, here are [his olimpbase records](https://www.olimpbase.org/Elo/player/Campora,%20Daniel%20H..html). He was 2543 in the July 1999 list and 2534 in the Jan 2000 list. Even playing blitz blindfold and drunk he would not have made those moves.
  
  Apropos the reuse of Tony Miles' FIN. From [his Olimpbase records](https://www.olimpbase.org/Elo/player/Miles,%20Anthony%20J..html) you can see that his FIN was 403385. Today the player with that FIN is [Andrew F Footner](http://ratings.fide.com/card.phtml?event=403385). Check his rating history and see that apparently he had [results in the October 2001 list](http://ratings.fide.com/individual_calculations.phtml?idnumber=403385&rating_period=2001-10-01&t=0). Except the player listed is Tony Miles! There are no more results until [January 2007](http://ratings.fide.com/individual_calculations.phtml?idnumber=403385&rating_period=2007-01-01&t=0) which are for Andrew F Footner.
  
  > **Comments:**
  > **username_0**: Thanks! Your answer reinforces my conviction that they are the same players :)! A possible explanation could be that he played in the US in 1997 and that an organizer misspelled his name from Gilberto to Gilbert and registered him as a new player. The organizer then sent the results to FIDE, who created a new player identification. It wouldn't be the first time that a player has two different FINs!  
  > **username_2**: @username_0 Could be. There was much confusion in the 90's regarding FINs. There is much dirty data as a result. There is far less dirty FIDE data today but even in the current FIDE list there are obvious errors.  
  
  ---
  
  