Les cas de nullité

   [Event "Le pion tour"]  [Site ""]  [Date "1997"]  [Round ""]  [White ""]  [Black ""]  [Result "1/2-1/2"]  [SetUp "1"]  [FEN "k7/8/PK6/8/8/8/8/8 w - - 0 1"]  [PlyCount "1"]  [EventDate "1997"]   {# Le pion tour est un pion particulier.} 1. a7 {pat!} 1/2-1/2   

   [Event "Pion tour 2è cas de Nullité"]  [Site ""]  [Date ""]  [Round ""]  [White ""]  [Black ""]  [Result "1/2-1/2"]  [SetUp "1"]  [FEN "8/K7/P1k5/8/8/8/8/8 b - - 0 1"]  [PlyCount "9"]   1... Kc7 2. Ka8 Kc8 3. Ka7 Kc7 4. Ka8 Kc8 5. a7 Kc7 1/2-1/2   

   [Event "7è gagnante"]  [Site ""]  [Date "1997"]  [Round ""]  [White ""]  [Black ""]  [Result "1-0"]  [SetUp "1"]  [FEN "4k3/8/3PK3/8/8/8/8/8 b - - 0 2"]  [PlyCount "6"]  [EventDate "1997"]   {#} 2... Kd8 (2... Kf8 $2 3. d7 Kg7 4. d8=Q) 3. d7 $1 {le pion est rentré sur  la 7è rangée, sans donner échec, ce qui donne la victoire aux blancs.} Kc7 4.  Ke7 Kc6 5. d8=Q 1-0   

   [Event "Pas de précipitation"]  [Site ""]  [Date ""]  [Round ""]  [White ""]  [Black ""]  [Result "1/2-1/2"]  [SetUp "1"]  [FEN "6k1/8/5KP1/6P1/8/8/8/8 w - - 0 1"]  [PlyCount "3"]  [EventDate "1997.??.??"]  [SourceDate "2025.07.26"]   1. g7 Kh7 2. Kf7 (2. g8=Q+ Kxg8 3. Kg6 Kh8 4. Kf7 Kh7 5. g6+ Kh8 6. g7+ Kh7 7.  g8=Q+ Kh6 8. Qg6#) 1/2-1/2