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Glorfindel ♦
Glorfindel ♦
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Thank you, Remellion, for providing a clear answer based upon the FIDE Laws. If the "+" is optional, it stands to reason that a PGN reader may presume this symbol may be discarded entirely, prior to processing moves of the game. Thus, it can not be correct to use the check symbol as a disambiguation, as it definitely results in ambiguity.

I presume checkmate and stalemate symbols are also optional. Thus, in this diagram (fen: QQ6/Qp6/2k5/8/8/8/1R3RN1/3N2KB w - - 0 1)...
enter image description here

[FEN "QQ6/Qp6/2k5/8/8/8/1R3RN1/3N2KB w - - 0 1"]
  1. Qa8xb7# is correct (the "#" is not a sufficient disambiguation of 1. Qxb7#).
  2. Rfd2= is correct (the "=" is not a sufficient disambiguation of 1. Rd2=).
  3. Nge3+ is correct (the "+" is not a sufficient disambiguation of 1. Ne3+).

And for those still not convinced... think of it another way... Suppose you give a beginning chess student this diagram as part of a hand-written #1 test (note: if so, first remove all white units except wK and 3 wQs). Now, who would honestly accept "Qxb7#" as a solution? Nobody! This is a clear failure to disambiguate which queen delivered the mate. Zero credit.

Thank you, Remellion, for providing a clear answer based upon the FIDE Laws. If the "+" is optional, it stands to reason that a PGN reader may presume this symbol may be discarded entirely, prior to processing moves of the game. Thus, it can not be correct to use the check symbol as a disambiguation, as it definitely results in ambiguity.

I presume checkmate and stalemate symbols are also optional. Thus, in this diagram (fen: QQ6/Qp6/2k5/8/8/8/1R3RN1/3N2KB w - - 0 1)...
enter image description here

  1. Qa8xb7# is correct (the "#" is not a sufficient disambiguation of 1. Qxb7#).
  2. Rfd2= is correct (the "=" is not a sufficient disambiguation of 1. Rd2=).
  3. Nge3+ is correct (the "+" is not a sufficient disambiguation of 1. Ne3+).

And for those still not convinced... think of it another way... Suppose you give a beginning chess student this diagram as part of a hand-written #1 test (note: if so, first remove all white units except wK and 3 wQs). Now, who would honestly accept "Qxb7#" as a solution? Nobody! This is a clear failure to disambiguate which queen delivered the mate. Zero credit.

Thank you, Remellion, for providing a clear answer based upon the FIDE Laws. If the "+" is optional, it stands to reason that a PGN reader may presume this symbol may be discarded entirely, prior to processing moves of the game. Thus, it can not be correct to use the check symbol as a disambiguation, as it definitely results in ambiguity.

I presume checkmate and stalemate symbols are also optional. Thus, in this diagram:

[FEN "QQ6/Qp6/2k5/8/8/8/1R3RN1/3N2KB w - - 0 1"]
  1. Qa8xb7# is correct (the "#" is not a sufficient disambiguation of 1. Qxb7#).
  2. Rfd2= is correct (the "=" is not a sufficient disambiguation of 1. Rd2=).
  3. Nge3+ is correct (the "+" is not a sufficient disambiguation of 1. Ne3+).

And for those still not convinced... think of it another way... Suppose you give a beginning chess student this diagram as part of a hand-written #1 test (note: if so, first remove all white units except wK and 3 wQs). Now, who would honestly accept "Qxb7#" as a solution? Nobody! This is a clear failure to disambiguate which queen delivered the mate. Zero credit.

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sdrawkcab
sdrawkcab
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Thank you, Remellion, for providing a clear answer based upon the FIDE Laws. If the "+" is optional, it stands to reason that a PGN reader may presume this symbol may be discarded entirely, prior to processing moves of the game. Thus, it can not be correct to use the check symbol as a disambiguation, as it definitely results in ambiguity.

I presume checkmate and stalemate symbols are also optional. Thus, in this diagram (fen: QQ6/Qp6/2k5/8/8/8/1R3RN1/3N2KB w - - 0 1)...
enter image description here

  1. Qa8xb7# is correct (the "#" is not a sufficient disambiguation of 1. Qxb7#).
  2. Rfd2= is correct (the "=" is not a sufficient disambiguation of 1. Rd2=).
  3. Nge3+ is correct (the "+" is not a sufficient disambiguation of 1. Ne3+).

And for those still not convinced... think of it another way... Suppose you give a beginning chess student this diagram as part of a hand-written #1 test (note: if so, first remove all white units except wK and 3 wQs). Now, who would honestly accept "Qxb7#" as a solution? Nobody! This is a clear failure to disambiguate which queen delivered the mate. Zero credit.