This is the seventh installment of the Fortnightly Topic Challenges Rerun described here and the forty-eigth installment of the FTCs overall, with topics suggested and voted on here. This fortnight's topic is "Unusual tag mix" (suggested by melfnt) and will span from the 24th of January to the 6th of February. 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.
The suggestion is copied to this post for posterity.
Unusual tag mix
I like puzzles that mix very different topics and solution methods, even completely unrelated to each other. So my proposal for this challenge is simple: pick any two (or more) tags that are unlikely to be seen together and create a puzzle.
Some of my favorite mixes:
To help you with choosing the tags, I set up this query on SEDE that selects the unused pairs of tags considering only the top 30 tags on PSE (i.e. for each line of the query results there is no question tagged with both tag1 and tag2). Here is a snapshot of the results as of 2020-12-08, re-run the query at any time to check if something changed:
tag1 tag2 calculation-puzzle cryptic-clues calculation-puzzle geography calculation-puzzle rebus calculation-puzzle steganography chess computer-puzzle chess english chess language chess pattern chess word-property combinatorics cipher combinatorics cryptic-clues combinatorics english combinatorics geography combinatorics language combinatorics rebus combinatorics rhyme combinatorics steganography combinatorics word-property cryptic-clues word-property geometry cryptic-clues geometry english geometry language geometry rebus geometry wordplay optimization cipher optimization cryptic-clues optimization geography optimization language optimization rebus optimization rhyme optimization steganography optimization wordplay optimization word-property rebus word-property rhyme word-property riddle optimization strategy cryptic-clues strategy english strategy language strategy rebus strategy rhyme strategy riddle strategy steganography strategy word strategy wordplay strategy word-property