4

Is there a general consensus amongst top chess players, composers, analyzists, and organizations, such as FIDE, for what exactly defines an en passant checkmate?

Is there any history for it?

As far as I know, there are two possibilities for what defines an en passant checkmate:

  1. When the pawn does the passant, moving as to allow another piece's attack range deliver the checkmate.

  2. When the pawn does the passant, and the pawn itself makes the checkmate.

4

After some research I could not find any "official" definition by a chess association/federation. This doesn't really surprise me, as there really is no need for a definition of "e.p. checkmate" to ensure correct play.

However the general internet consensus on the usage of the term seems to agree on the following requirements:

  • The game has to end with checkmate.
  • The last move has to be played en passant.

An exemplary notated move would be "29... cxd e.p. #" (although notating e.p. is optional under the FIDE laws of chess (C.9)) - regardless if the pawn capturing delivers check or not. The Wikipedia examples follow this definition.

As there is no opinion by a regulatory instance about this topic, it seems to be up to you to make up your mind on this topic or bringing it to the attention of said regulatory instance. I am taking the "democratic" approach with the above definition.

2

I don't think it is defined at all. But in your first case, the pawn is delivering the mate. So I think that would be the 'en passant mate'. The 2nd case is 'just' a discovered mate.

  • For the 2nd one yes, it is a discovered mate. But since en passant is a big of a special move in chess, is it not but a bit of a special checkmate, and therefore count as an en passant checkmate? I think I may need to direct you to a few YouTube videos where en passant mates are featured by very knowledgeable chess players. youtu.be/IJe-euFg_4k youtu.be/wsmtkBPVqWs – Rewan Demontay Feb 27 '19 at 12:39
  • I did some research and could not find any "official" definition by a chess association/federation. This doesn't surprise me, as there really is no need for a definition of "e.p. checkmate" to ensure correct play. However the general consensus on the internet seems to be, that a game ended in checkmate if the last move was played en passant (e.g. "29... cxd e.p. #). Now it is up to you to make up your mind on this topic - I am taking the democratic approach on this one. ;) (I can add this as an answer if needed. If I have time I might try to scrape some forums for data on this topic.) – Benjamin Raabe Feb 27 '19 at 13:10
  • I would prefer that an answer as you suggested please @BenjaminRaabe – Rewan Demontay Feb 28 '19 at 12:45

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