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This is the twenty-ninth instalment of the Fortnightly Topic Challenge described here, with topics suggested and voted on here. This fortnight's topic is (suggested by user24580), and will span from the the 21st of March to the 4th of April. During this period, we will compile the list of questions with this tag and post it as an answer to this question.

In the meantime, please go and propose and vote on future challenges!

Everyone have fun, and happy puzzling!


Link to other Fortnightly Topic Challenges.

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    $\begingroup$ While this is not something I came up with, I came across a blog full of various (simple to an extent) retrograde analysis puzzles. Ranging from tic-tac-toe to dots-n-boxes. Maybe it'll provide some inspiration for puzzles outside of chess as many people seem to only tie this tag to chess based puzzles. joekisenwether.wordpress.com/non-chess-retrograde-analysis $\endgroup$ – n_plum Mar 26 '17 at 3:20
  • $\begingroup$ Thanks for the link. Kisenwether's Scrabble retro is stupendous. I seem to recall (I'm not at home now so I can't check) that I rechecked it with a word list which is still current, and it is still sound although there are more cases to check. (ISTR the new word APO is an issue.) $\endgroup$ – Rosie F Apr 4 '17 at 14:34
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List of all questions published as part of the Fortnightly Topic Challenge #29:


The highest-voted and the most viewed of these is Let's continue our Monopoly game by David Starkey, with a score of 18 and approximately 2000 views at the end of the fortnight.


* Note: KeyboardWielder's puzzle uses the tag in its more general sense, as discussed here.

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