[Retros] A question on stipulations

[Renny Bosch]

Hi Bernd,

Thanks for your answer, I hadn't thought of that possibility.  But that 
still is a demonstration of a legal game.  What I am wondering is:  If the 
answer is NO and the proof is an elaborate explanation of why every possible 
attempt at resolving the position leads to a dead end, would they publish 
such a problem?  My strong assumption is "Obviously not", but I've been 
warned not to assume.

Renny


----- Original Message ----- 
From: "Bernd Gräfrath" <retromode at web.de>
To: "The Retrograde Analysis Mailing List" <retros at janko.at>
Sent: Friday, November 20, 2009 2:28 AM
Subject: Re: [Retros] A question on stipulations


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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