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This is the sixth installment of the Fortnightly Topic Challenges Rerun described here and the fortieth installment of the FTCs overall, with topics suggested and voted on here. This fortnight's topic is "Retrograde Analysis" (suggested by Riley) and will span from the 15th of October to the 28th of October. During this period, we will compile the list of relevant questions 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.

NOTE
Examples of previous puzzles may be found by clicking on the tag, and the full tag wiki entry is here.

The original suggestion here provides a list of games that may work well with the challenge, but there are many more, and puzzlers are always encouraged to show creativity by finding interesting puzzles outside of expectation.

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List of all questions published as part of the Fortnightly Topic Challenge #40:


The highest-voted and the most viewed of these is Mate in 0 moves by JGibbers, with a score of 82 and approximately 12600 views at the end of the fortnight.

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  • $\begingroup$ What does the "colorful glass circle" puzzle has to do with chess? $\endgroup$ – vsz Oct 22 '18 at 21:58
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    $\begingroup$ @vsz This fortnight's topic is not "Chess" but "Retrograde Analysis". But the question remain: What does the "colorful glass circle" puzzle has to do with Retrograde Analysis ? $\endgroup$ – Evargalo Oct 23 '18 at 8:25

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