Answers.Body: <p>I do not think that the game just ended there. It is more likely that the second source simply could not handle the null move.</p>
  
  <p>This is a bit unusual that it would be so through, but looking at the subsequent moves, we can rule out almost every move there, and figure out what had to have been played.</p>
  
  <p>The available moves on move 19 are: Kb1, Qd2 moves, Rd1, Be3 moves, Bf1 moves, Rg1 moves, and the one of the k-side pawns move to the sixth rank. It is doubtful that either the a-pawn, or b-pawn moved as both players are Masters, and those are horrible moves.</p>
  
  <ol>
  <li>We know that it was not Kb1 since that moved on move 20.</li>
  <li>We know that the Qd2 did not move since it was exchanged on d2 on move 21.</li>
  <li>We know it was not the Rd1 since it recaptured the queen on move 22.</li>
  <li>It is highly doubtful that the Be3 moved since f2 would have been the only square, and it later moved when attacked on move 24...Rh3.</li>
  <li>This is my guess that the B went to e2 since it is literally the only move left.</li>
  <li>It cannot be that the Rg1 moved since it later moved Re1 on move 28.</li>
  <li>It cannot be the k-side pawns moving since they got traded on move 29.</li>
  </ol>
  
  <p>The last possibility is that there was an error in the scoresheet prior to the null move, and whoever was recording this just moved on from there.</p>
  
  <p>On the First Saturday Chess Tournament web site, where this was played, <a href="http://firstsaturday.hu/1811/CB/im/games/dgt_chesstheatre.htm" rel="nofollow noreferrer">the game viewer lists this scoresheet after this move as "unreadable".</a></p>
  
  <p>Update: Based on Evargalo's Qd4 move hypothesis, that probably should be the accepted answer as it makes great sense positionally.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T12:12:55.437Z
Answers.Text: Besides the two questions I asked you (which you haven't provided an answer to), I have other questions relevant to your post. Why do you think the game did not just end there? It is easy to see that Black has a very bad position after pushing the pawn, so do you really think Black could not have resigned after realizing it was a mistake? Also, you include the possibility of an error on the scoresheet, but what about the possibility that extra moves were written onto the scoresheet after the game results had been recorded?
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-24T20:34:36.957Z
Answers.LastActivityDate: 2019-11-25T14:42:25.777Z
Answers.LastEditDate: 2019-11-25T14:42:25.777Z
Answers.UserDisplayName: PhishMaster
Answers.Body: <p>I have an alternative hypothesis. When I looked at the game before move 19, it seemed to me that White has a big advantage by pushing <code>f6</code>. Indeed, <a href="https://lichess.org/analysis/standard/r3kn2/4bppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_w_q_-_0_19" rel="nofollow noreferrer">Stockfish (10+) agrees</a>. It could be that Black resigned after move 18, but one or both of them was curious as to whether Black could save the game if given an extra move, so they continued playing after skipping White's turn.</p>
  
  <p>One way to block <code>f6</code> is indeed <code>Nd7</code>, after which White's threat of <code>f6</code> is completely nullified and White no longer has a big advantage, <a href="https://lichess.org/analysis/standard/r3k3/3nbppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_w_q_-_1_20" rel="nofollow noreferrer">in agreement with Stockfish</a>, and now is better off playing <code>Kb1</code> to preemptively protect against <code>b4</code>.</p>
  
  <p>Incidentally, <a href="https://lichess.org/analysis/standard/r3kn2/4bppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_b_q_-_0_19" rel="nofollow noreferrer">Stockfish (at least at depth 20) thinks</a> Black's best extra move should be not <code>Nd7</code> but <code>b4</code>.</p>
  
  <p>Although it is hard to believe that illegal moves after a game could make it into a database, it is also a bit hard to believe that White moved <code>Be2</code> (a rather poor move) and that Black would just resign after White's move 34, since there is no clear advantage for White at that point (except being 1 pawn up).</p>
  
  <p>I suppose the best way to know for sure is to ask the players themselves.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T10:37:28.657Z
Answers.Text: I saw that too, but the person, who actually entered the game online, a person, who is from the tournament, entered additional moves, and specifically wrote "unreadable". That means there were additional moves.
Answers.UserDisplayName: PhishMaster
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T11:01:05.130Z
Answers.Text: @PhishMaster: Who is this "person"? Is this "person" the sole source of the additional moves? Why would White play "Be2", and why would Black resign when having a good chance of draw? I know that this hypothesis is weird, but unless a convincing answer is given for these two questions, I would doubt that the claimed record was the actual game.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T11:41:47.513Z
Answers.Text: It is clearly someone associated with the tournament...either the organizer, or his helper, who had the original scoresheet IN HAND, and was entering them online. I quoted the official site.
Answers.UserDisplayName: PhishMaster
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T12:00:17.930Z
Answers.Text: @PhishMaster: Are you saying a helper would never upload wrong records? Look, I'm just weighing the likelihood of the possibilities, and I have already given reasons for doubting the record.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T13:30:39.257Z
Answers.Text: Chess requires logic: No, I would never say that anyone is infallible, however, when the person writes "unreadable", how exactly do you propose they got that wrong??? I am done debating this
Answers.UserDisplayName: PhishMaster
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T13:41:11.687Z
Answers.Text: @PhishMaster: There are so many possible reasons for a mistake. Here is just 1: The game ended with Black resigning, and the result was recorded, and then the players continued the game while writing down more moves after putting some mark/word in the space for White's 19th move, and then later the scoresheet was collected but the transcriber did not know what had happened and so found it "unreadable" because of not expecting anything other than valid chess moves.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T13:48:29.903Z
Answers.Text: @PhishMaster: Anyway, Evargalo's hypothesis is so much more likely than yours or mine, so it doesn't matter now.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-26T20:42:19.713Z
Answers.Text: @user21820: that would be against the rules in several ways (staying in the playing area when the game has finished, analysing in the playing area, writing extra moves on the official score sheet after the game has finished) that the arbiter would never allow it.
Answers.UserDisplayName: RemcoGerlich
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-27T10:07:19.000Z
Answers.Text: @RemcoGerlich: I meant that they showed the scoresheet to the director, and then took it back and went off elsewhere to continue the game, and then later the transcriber asked them for it. I don't dispute that it is very implausible, and as I said it's clear that Evargalo's answer is surely right.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T07:00:28.180Z
Answers.LastActivityDate: 2019-11-25T07:32:34.097Z
Answers.LastEditDate: 2019-11-25T07:32:34.097Z
Answers.UserDisplayName: user21820
Answers.Body: <p><strong>Best guess: the mistake occured before, on move 15</strong></p>
  
  <p>Entry errors are frequent when games are entered into a software, especially if they are not entered by one of the players.</p>
  
  <p>Here the operator must have made an error <em>before</em> move 19, reached an anomaly, and couldn't solve the mystery (or didn't have time to try, there are other games to be saved). In such occurence, entering a null move solves the issue, even if it makes some future users wonder what exactly happened during the game. </p>
  
  <p>Only one of the players, or someone with access to the handwritten gamescore, could answer with 100% certainty, so I cannot be totally affirmative, but I am pretty sure the error occured on move 15. This must be how the game went:</p>
  
  <pre><code>[Event "FSIM November 2018"]
  [Site "Budapest HUN"]
  [Date "2018.11.06"]
  [Round "4.4"]
  [White "Farago, Sandor"]
  [Black "Li, Hong"]
  [Result "1-0"]
  [WhiteElo "2216"]
  [BlackElo "2337"]
  [ECO "B80"]
  [EventDate "2018.11.03"]
  [FEN ""]
  
  1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.Nc3 cxd4 5.Nxd4 a6 6.f3 e6 7.Be3 b5 8.a3 Bb7 
  9.g4 h6 10.h4 Nc6 11.Nxc6 Bxc6 12.Rg1 Nd7 13.g5 hxg5 14.hxg5 Be7 15.Qd4 
  Rh7 16.O-O-O Nf8 17.f4 Qa5 18.f5 e5 19. Qd2 Nd7 20.Kb1 Rb8 21.Nd5 Qxd2 22.
  Rxd2 Bxd5 23.Rxd5 Rh4 24.Bd3 Rh3 25.Ba7 Rb7 26.Bf2 Rh2 27.Be3 Rh3 28.Re1 
  Nb8 29.f6 gxf6 30.gxf6 Bxf6 31.Rxd6 Bg7 32.Rd5 Nc6 33.Bd2 f6 34.Rg1 1-0
  </code></pre>
  
  <ul>
  <li><p><strong>15.Qd4</strong>, instead of 15.Qd2, is a very logical move, centralizing the queen and hitting the Pg7 left unprotected by Black's last move, 14...Bf8-e7. It is also a typical move when a Nd4-Nc6 exchange occurs in the Najdorf with the wQ still on d1.</p></li>
  <li><p>It doesn't take a lot of stretch for an handwritten "Qd4" to be mistaken for "Qd2" (another plausible move) by the operator. </p></li>
  <li><p>Then the operator won't meet any incoherence before move 19, when he finds 19.Qd2 written on the scoresheet but, puzzlingly, the queen already stands on d2. If the explanation doesn't jump to his eyes, using the <em>null move</em> feature of the software (most probably Chessbase) is the simplest way to deal with it. I have done that often myself when entering kids' games whose scoresheets I couldn't decipher.</p></li>
  <li><p>By the way, 19.Qd2 is the obvious choice if the queen comes from d4, attacked by Black last move, 18...e6-e5. The whole game looks very coherent in this version (but that Black is positionnally outplayed pretty fast, with 22...Bxd5? a very suspect choice).</p></li>
  <li><p>The most important argument in favor of 15.Qd4, in my opinion, is that it gives an explanation for the otherwise mysterious move 15...Rh7 played by Black: he simply protected his pawn. If 15.Qd2 had been played, 15...Rh7 would be a very, very weird decision (instead of any of the logical developing moves 15...Qc7, 15...Nf8, 15...Rc8, 15...Nb6, 15...g6 or 15....Qa5).</p></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T13:46:42.127Z
Answers.Text: This must be it, I agree. I was earlier looking for something like this and also noticed that Rh7 was very strange, but I didn't find a way to connect it to the null move. Well spotted.
Answers.UserDisplayName: RemcoGerlich
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T13:47:24.307Z
Answers.Text: Your hypothesis is so much more likely than PhishMaster's, and definitely explains the Rh7.
Answers.UserDisplayName: user21820
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T14:34:23.930Z
Answers.Text: I like your answer as being the most logical set of moves. I did leave open the possibility that the error occurred before also. That said, there are probably more moves beyond move 34 too, or he flagged. 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. Nc3 cxd4 5. Nxd4 a6 6. f3 e6 7. Be3 b5 8. a3 Bb7 9. g4 h6 10. h4 Nc6 11. Nxc6 Bxc6 12. Rg1 Nd7 13. g5 hxg5 14. hxg5 Be7 15. Qd4 Rh7 16. O-O-O Nf8 17. f4 Qa5 18. f5 e5 19. Qd2 Nd7 20. Kb1 Rb8 21. Nd5 Qxd2 22. Rxd2 Bxd5 23. Rxd5 Rh4 24. Bd3 Rh3 25. Ba7 Rb7 26. Bf2 Rh2 27. Be3 Rh3 28. Re1 Nb8 29. f6 gxf6 30. gxf6 Bxf6 31. Rxd6 Bg7 32. Rd5 Nc6 33. Bd2 f6 34 Rg1 1-0
Answers.UserDisplayName: PhishMaster
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T14:36:07.950Z
Answers.Text: @PhishMaster : I agree with you. Although White is definitely winning at move 34, this would be a very weird moment to resign, when material is still nominaly equal.
Answers.UserDisplayName: Evargalo
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T14:40:47.537Z
Answers.Text: I up-voted your answer, and would accept it if I were the OP.
Answers.UserDisplayName: PhishMaster
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-25T12:58:18.593Z
Answers.LastActivityDate: 2019-11-29T23:38:31.790Z
Answers.LastEditDate: 2019-11-29T23:38:31.790Z
Answers.UserDisplayName: Evargalo
Body: <p>I downloaded a bunch of games from <a href="http://www.kingbase-chess.net/" rel="nofollow noreferrer">Kingbase</a> which included the below game.</p>
  
  <pre><code>[Event "FSIM November 2018"]
  [Site "Budapest HUN"]
  [Date "2018.11.06"]
  [Round "4.4"]
  [White "Farago, Sandor"]
  [Black "Li, Hong"]
  [Result "1-0"]
  [WhiteElo "2216"]
  [BlackElo "2337"]
  [ECO "B80"]
  [EventDate "2018.11.03"]
  [FEN ""]
  
  1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.Nc3 cxd4 5.Nxd4 a6 6.f3 e6 7.Be3 b5 8.a3 Bb7 
  9.g4 h6 10.h4 Nc6 11.Nxc6 Bxc6 12.Rg1 Nd7 13.g5 hxg5 14.hxg5 Be7 15.Qd2 
  Rh7 16.O-O-O Nf8 17.f4 Qa5 18.f5 e5 19. null Nd7 20.Kb1 Rb8 21.Nd5 Qxd2 22.
  Rxd2 Bxd5 23.Rxd5 Rh4 24.Bd3 Rh3 25.Ba7 Rb7 26.Bf2 Rh2 27.Be3 Rh3 28.Re1 
  Nb8 29.f6 gxf6 30.gxf6 Bxf6 31.Rxd6 Bg7 32.Rd5 Nc6 33.Bd2 f6 34.Rg1 1-0
  </code></pre>
  
  <p>I'm confused about the notation in move 19 . I couldn't find any reference on how to interpret it. According to <a href="https://www.365chess.com/tournaments/FSIM_November_2018_2018/43020" rel="nofollow noreferrer">another source</a> the tournament ended after move 18.</p>
  
  <p>At first I thought maybe the time ran out and they decided to finish the game just for fun, But then why didn't White make the next move, and not black?</p>
  
  <p>Different PGN replayers display this game differently. Gnome-chess refuses to display the game with move 19, while <a href="https://www.chess.com/analysis" rel="nofollow noreferrer">chess.com analysis</a> interprets it as an empty move.</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-24T20:14:44.517Z
Comments.Text: Chessbase Mega 2019 has it the same way.
Comments.UserDisplayName: PhishMaster
Tags: <tournament><pgn><notation>
Title: What happened in this game between Hong Li and Sandor Farago in the FSIM November 2018?
ThreadText: # What happened in this game between Hong Li and Sandor Farago in the FSIM November 2018?
  
  (Asked by: username_0 on 2019-11-24)
  
  I downloaded a bunch of games from Kingbase which included the below game.
  [Event "FSIM November 2018"]
  [Site "Budapest HUN"]
  [Date "2018.11.06"]
  [Round "4.4"]
  [White "Farago, Sandor"]
  [Black "Li, Hong"]
  [Result "1-0"]
  [WhiteElo "2216"]
  [BlackElo "2337"]
  [ECO "B80"]
  [EventDate "2018.11.03"]
  [FEN ""]
  
  1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.Nc3 cxd4 5.Nxd4 a6 6.f3 e6 7.Be3 b5 8.a3 Bb7 
  9.g4 h6 10.h4 Nc6 11.Nxc6 Bxc6 12.Rg1 Nd7 13.g5 hxg5 14.hxg5 Be7 15.Qd2 
  Rh7 16.O-O-O Nf8 17.f4 Qa5 18.f5 e5 19. null Nd7 20.Kb1 Rb8 21.Nd5 Qxd2 22.
  Rxd2 Bxd5 23.Rxd5 Rh4 24.Bd3 Rh3 25.Ba7 Rb7 26.Bf2 Rh2 27.Be3 Rh3 28.Re1 
  Nb8 29.f6 gxf6 30.gxf6 Bxf6 31.Rxd6 Bg7 32.Rd5 Nc6 33.Bd2 f6 34.Rg1 1-0
  
  I'm confused about the notation in move 19 . I couldn't find any reference on how to interpret it. According to another source the tournament ended after move 18.
  At first I thought maybe the time ran out and they decided to finish the game just for fun, But then why didn't White make the next move, and not black?
  Different PGN replayers display this game differently. Gnome-chess refuses to display the game with move 19, while chess.com analysis interprets it as an empty move.
  
  **Tags:** tournament, pgn, notation
  
  > **Comments:**
  > **username_1**: Chessbase Mega 2019 has it the same way.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_4 on 2019-11-25. Score: 12 | Accepted answer
  
  Best guess: the mistake occured before, on move 15
  Entry errors are frequent when games are entered into a software, especially if they are not entered by one of the players.
  Here the operator must have made an error before move 19, reached an anomaly, and couldn't solve the mystery (or didn't have time to try, there are other games to be saved). In such occurence, entering a null move solves the issue, even if it makes some future users wonder what exactly happened during the game. 
  Only one of the players, or someone with access to the handwritten gamescore, could answer with 100% certainty, so I cannot be totally affirmative, but I am pretty sure the error occured on move 15. This must be how the game went:
  [Event "FSIM November 2018"]
  [Site "Budapest HUN"]
  [Date "2018.11.06"]
  [Round "4.4"]
  [White "Farago, Sandor"]
  [Black "Li, Hong"]
  [Result "1-0"]
  [WhiteElo "2216"]
  [BlackElo "2337"]
  [ECO "B80"]
  [EventDate "2018.11.03"]
  [FEN ""]
  
  1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.Nc3 cxd4 5.Nxd4 a6 6.f3 e6 7.Be3 b5 8.a3 Bb7 
  9.g4 h6 10.h4 Nc6 11.Nxc6 Bxc6 12.Rg1 Nd7 13.g5 hxg5 14.hxg5 Be7 15.Qd4 
  Rh7 16.O-O-O Nf8 17.f4 Qa5 18.f5 e5 19. Qd2 Nd7 20.Kb1 Rb8 21.Nd5 Qxd2 22.
  Rxd2 Bxd5 23.Rxd5 Rh4 24.Bd3 Rh3 25.Ba7 Rb7 26.Bf2 Rh2 27.Be3 Rh3 28.Re1 
  Nb8 29.f6 gxf6 30.gxf6 Bxf6 31.Rxd6 Bg7 32.Rd5 Nc6 33.Bd2 f6 34.Rg1 1-0
  
  
  15.Qd4, instead of 15.Qd2, is a very logical move, centralizing the queen and hitting the Pg7 left unprotected by Black's last move, 14...Bf8-e7. It is also a typical move when a Nd4-Nc6 exchange occurs in the Najdorf with the wQ still on d1.
  It doesn't take a lot of stretch for an handwritten "Qd4" to be mistaken for "Qd2" (another plausible move) by the operator. 
  Then the operator won't meet any incoherence before move 19, when he finds 19.Qd2 written on the scoresheet but, puzzlingly, the queen already stands on d2. If the explanation doesn't jump to his eyes, using the null move feature of the software (most probably Chessbase) is the simplest way to deal with it. I have done that often myself when entering kids' games whose scoresheets I couldn't decipher.
  By the way, 19.Qd2 is the obvious choice if the queen comes from d4, attacked by Black last move, 18...e6-e5. The whole game looks very coherent in this version (but that Black is positionnally outplayed pretty fast, with 22...Bxd5? a very suspect choice).
  The most important argument in favor of 15.Qd4, in my opinion, is that it gives an explanation for the otherwise mysterious move 15...Rh7 played by Black: he simply protected his pawn. If 15.Qd2 had been played, 15...Rh7 would be a very, very weird decision (instead of any of the logical developing moves 15...Qc7, 15...Nf8, 15...Rc8, 15...Nb6, 15...g6 or 15....Qa5).
  
  > **Comments:**
  > **username_3**: This must be it, I agree. I was earlier looking for something like this and also noticed that Rh7 was very strange, but I didn't find a way to connect it to the null move. Well spotted.  
  > **username_2**: Your hypothesis is so much more likely than username_1's, and definitely explains the Rh7.  
  > **username_1**: I like your answer as being the most logical set of moves. I did leave open the possibility that the error occurred before also. That said, there are probably more moves beyond move 34 too, or he flagged. 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. Nc3 cxd4 5. Nxd4 a6 6. f3 e6 7. Be3 b5 8. a3 Bb7 9. g4 h6 10. h4 Nc6 11. Nxc6 Bxc6 12. Rg1 Nd7 13. g5 hxg5 14. hxg5 Be7 15. Qd4 Rh7 16. O-O-O Nf8 17. f4 Qa5 18. f5 e5 19. Qd2 Nd7 20. Kb1 Rb8 21. Nd5 Qxd2 22. Rxd2 Bxd5 23. Rxd5 Rh4 24. Bd3 Rh3 25. Ba7 Rb7 26. Bf2 Rh2 27. Be3 Rh3 28. Re1 Nb8 29. f6 gxf6 30. gxf6 Bxf6 31. Rxd6 Bg7 32. Rd5 Nc6 33. Bd2 f6 34 Rg1 1-0  
  > **username_4**: @username_1 : I agree with you. Although White is definitely winning at move 34, this would be a very weird moment to resign, when material is still nominaly equal.  
  > **username_1**: I up-voted your answer, and would accept it if I were the OP.  
  
  ---
  
  ### Answer by username_1 on 2019-11-24. Score: 4
  
  I do not think that the game just ended there. It is more likely that the second source simply could not handle the null move.
  
  This is a bit unusual that it would be so through, but looking at the subsequent moves, we can rule out almost every move there, and figure out what had to have been played.
  
  The available moves on move 19 are: Kb1, Qd2 moves, Rd1, Be3 moves, Bf1 moves, Rg1 moves, and the one of the k-side pawns move to the sixth rank. It is doubtful that either the a-pawn, or b-pawn moved as both players are Masters, and those are horrible moves.
  
  1. We know that it was not Kb1 since that moved on move 20.
  2. We know that the Qd2 did not move since it was exchanged on d2 on move 21.
  3. We know it was not the Rd1 since it recaptured the queen on move 22.
  4. It is highly doubtful that the Be3 moved since f2 would have been the only square, and it later moved when attacked on move 24...Rh3.
  5. This is my guess that the B went to e2 since it is literally the only move left.
  6. It cannot be that the Rg1 moved since it later moved Re1 on move 28.
  7. It cannot be the k-side pawns moving since they got traded on move 29.
  
  The last possibility is that there was an error in the scoresheet prior to the null move, and whoever was recording this just moved on from there.
  
  On the First Saturday Chess Tournament web site, where this was played, [the game viewer lists this scoresheet after this move as "unreadable".](http://firstsaturday.hu/1811/CB/im/games/dgt_chesstheatre.htm)
  
  Update: Based on username_4's Qd4 move hypothesis, that probably should be the accepted answer as it makes great sense positionally.
  
  > **Comments:**
  > **username_2**: Besides the two questions I asked you (which you haven't provided an answer to), I have other questions relevant to your post. Why do you think the game did not just end there? It is easy to see that Black has a very bad position after pushing the pawn, so do you really think Black could not have resigned after realizing it was a mistake? Also, you include the possibility of an error on the scoresheet, but what about the possibility that extra moves were written onto the scoresheet after the game results had been recorded?  
  
  ---
  
  ### Answer by username_2 on 2019-11-25. Score: 1
  
  I have an alternative hypothesis. When I looked at the game before move 19, it seemed to me that White has a big advantage by pushing `f6`. Indeed, [Stockfish (10+) agrees](https://lichess.org/analysis/standard/r3kn2/4bppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_w_q_-_0_19). It could be that Black resigned after move 18, but one or both of them was curious as to whether Black could save the game if given an extra move, so they continued playing after skipping White's turn.
  
  One way to block `f6` is indeed `Nd7`, after which White's threat of `f6` is completely nullified and White no longer has a big advantage, [in agreement with Stockfish](https://lichess.org/analysis/standard/r3k3/3nbppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_w_q_-_1_20), and now is better off playing `Kb1` to preemptively protect against `b4`.
  
  Incidentally, [Stockfish (at least at depth 20) thinks](https://lichess.org/analysis/standard/r3kn2/4bppr/p1bp4/qp2pPP1/4P3/P1N1B3/1PPQ4/2KR1BR1_b_q_-_0_19) Black's best extra move should be not `Nd7` but `b4`.
  
  Although it is hard to believe that illegal moves after a game could make it into a database, it is also a bit hard to believe that White moved `Be2` (a rather poor move) and that Black would just resign after White's move 34, since there is no clear advantage for White at that point (except being 1 pawn up).
  
  I suppose the best way to know for sure is to ask the players themselves.
  
  > **Comments:**
  > **username_1**: I saw that too, but the person, who actually entered the game online, a person, who is from the tournament, entered additional moves, and specifically wrote "unreadable". That means there were additional moves.  
  > **username_2**: @username_1: Who is this "person"? Is this "person" the sole source of the additional moves? Why would White play "Be2", and why would Black resign when having a good chance of draw? I know that this hypothesis is weird, but unless a convincing answer is given for these two questions, I would doubt that the claimed record was the actual game.  
  > **username_1**: It is clearly someone associated with the tournament...either the organizer, or his helper, who had the original scoresheet IN HAND, and was entering them online. I quoted the official site.  
  > **username_2**: @username_1: Are you saying a helper would never upload wrong records? Look, I'm just weighing the likelihood of the possibilities, and I have already given reasons for doubting the record.  
  > **username_1**: Chess requires logic: No, I would never say that anyone is infallible, however, when the person writes "unreadable", how exactly do you propose they got that wrong??? I am done debating this  
  > **username_2**: @username_1: There are so many possible reasons for a mistake. Here is just 1: The game ended with Black resigning, and the result was recorded, and then the players continued the game while writing down more moves after putting some mark/word in the space for White's 19th move, and then later the scoresheet was collected but the transcriber did not know what had happened and so found it "unreadable" because of not expecting anything other than valid chess moves.  
  > **username_2**: @username_1: Anyway, username_4's hypothesis is so much more likely than yours or mine, so it doesn't matter now.  
  > **username_3**: @username_2: that would be against the rules in several ways (staying in the playing area when the game has finished, analysing in the playing area, writing extra moves on the official score sheet after the game has finished) that the arbiter would never allow it.  
  > **username_2**: @username_3: I meant that they showed the scoresheet to the director, and then took it back and went off elsewhere to continue the game, and then later the transcriber asked them for it. I don't dispute that it is very implausible, and as I said it's clear that username_4's answer is surely right.  
  
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