Cheryl's Birthday
Hans van Ditmarsch, Michael Ian Hartley, Barteld Kooi, Jonathan, Welton, Joseph B.W. Yeo

TL;DR
This paper introduces four logic puzzles, including 'Cheryl's Birthday' and others, along with their solutions, highlighting novel problem designs and solution methods in the domain of logic puzzles.
Contribution
It presents new logic puzzles and their solutions, including a novel approach to 'One Hundred Prisoners and a Light Bulb' by Mike Hartley.
Findings
Four logic puzzles with solutions are provided.
A novel solution method for 'One Hundred Prisoners and a Light Bulb' is introduced.
The puzzles demonstrate diverse logic problem-solving techniques.
Abstract
We present four logic puzzles and after that their solutions. Joseph Yeo designed 'Cheryl's Birthday'. Mike Hartley came up with a novel solution for 'One Hundred Prisoners and a Light Bulb'. Jonathan Welton designed 'A Blind Guess' and 'Abby's Birthday'. Hans van Ditmarsch and Barteld Kooi authored the puzzlebook 'One Hundred Prisoners and a Light Bulb' that contains other knowledge puzzles, and that can also be found on the webpage http://personal.us.es/hvd/lightbulb.html dedicated to the book.
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