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Guest Message by DevFuse

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blind bartender

Best Answer plasmid, 30 September 2013 - 04:34 AM

Very neat problem. The answer is certainly unintuitive.

Spoiler for Checkmate in 7

Edit: renamed states for clarity Go to the full post

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12 replies to this topic

#11 phil1882


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Posted 01 October 2013 - 10:13 PM

if all 4 glasses are up or all 4 down, the game is over at the start.

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#12 radio1



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Posted 02 October 2013 - 02:07 PM

if all 4 glasses are up or all 4 down, the game is over at the start.

I see from BMAD's earlier respose that this is his intended interpretation, but to me the wording of the puzzle doesn't make that clear.  As stated, the puzzle seems to have the bartender blindfolded and engaged in a minimum of one "round" of turning over either 1 or 2 glasses, as only "After each round, the bartender is told if all glasses are oriented the same and the game is over.".

Fun puzzle though either way -- and the logic in plasmid's solution extends to either interpretation.

Thanks to all.


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#13 BMAD


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Posted 02 October 2013 - 04:33 PM

Nice point radio1.  I guess the question would be, would the start of round 1 mean the end of round zero and hence the bartender would be told that the glasses are not all in the same orientation. or would the start of round 2 be the first time the bartender is informed.


To me, in a practical sense, i would tell the bartender that i am mixing up four glasses and he will have to correctly orient them while blindfolded (telling him the rules of the game), so essentially, i am telling him at round zero that the glasses are not in the same orientation.  


But either way, you are right in that Plasmid's solution still works.

Edited by BMAD, 02 October 2013 - 04:34 PM.

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