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.