[Retros] A question on stipulations

[Bernd Gräfrath]

Hello,

the answer might be "No", because the side which seems to be mated could have a right to capture en passant.

Best,

Bernd




> -----Ursprüngliche Nachricht-----

> Von: "Renny Bosch" <rbosch at roadrunner.com>

> Gesendet: 20.11.09 05:14:27

> An: <retros at janko.at>

> Betreff: [Retros] A question on stipulations


If the stipulation is "Mate?" (in a position that clearly looks like 

> mate), may one assume that the answer must be "Yes", accompanied by 

> proof that the position is legal? The alternative would require proof 

> that the position is illegal, i.e. there does not exist a game that 

> produces the given position. In the first place a non-existence proof 

> is much more difficult than an existence demonstration (typically 

> requiring computer assistance to be certain), and in the second place 

> such a proof is much less satisfying than a game with some ingenious 

> twists and turns. May we therefore assume that such a problem would 

> not have been published unless the answer were "Yes"?

> 

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> 

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