I'm super excited to publish my first NYT crossword puzzle! I can't remember how this idea originated, but it was a year or two ago. I messed around with some different grids and didn't actually think it would be possible to fill the grid with "AL", the symbol for aluminum, down each side. Then, last spring I came across the phrase "ALL THINGS BEING EQUAL" – I put that across the center, built a grid around it, and worked hard to fill the puzzle. I submitted the puzzle in the summer and it was rejected – too many obscure words (e.g. "ALGORES", which I sort of knew was pushing it…) and "SIDING" was not in the grid itself. But, Will liked the theme, so I tried again.

I managed to remove most of the puzzle killers and put "SIDING" into the upper right part of the puzzle (not ideal), but there were still problems. I knew that the main issue was the "Q" in the phrase across the middle, which limited words that could cross it. I found the "Albert Einstein Medal" and thought that had much better letters. So, I started over, put "SIDING" in the lower right section, and was able to fill the rest of the grid quite sensibly. (I tried hard to avoid cheater squares, but couldn't finish it without 6 of them.) I resubmitted the puzzle and, after a few exchanges and refinement with Will, we found a fill that worked.

This puzzle took me a long time to make. What made it tough is that there was only one spot in the lower right for "SIDING" and only one spot for "ALUMINUM", and there aren't a ton of "AL" words — I needed 22 of them + the 19-letter phrase.

Hope you enjoy it!

(AL)UMINUM SIDING added to today's puzzle, featuring the chemical symbol for aluminum, Al. Check out the grid below for the deets. We've also corrected the appropriate answers so they match the clues. We wouldn't want to add ERT or LEGE to our database!

Neat concept. (AL)BERT EINSTEIN MED(AL) is such a great feature entry for this puzzle, just perfect how 1.) it has an AL on either side, 2.) it's 19 letters long, making it exactly 15 letters without the ALs and 3.) it's such a great-sounding entry. Reminds me of another puzzle featuring OUTSIDERS.

The first step in this construction is quite easy — you start with a 19x15 grid, with AL down each side in columns 1, 2, 18, and 19 (and black squares appropriately extended out to the sides). After you're done, you can lop off those extra columns, and voila!

HOWEVER … the execution is not easy at all. There are a reasonable number of words that start / end with AL, but limiting yourself to just that subset makes things so rough when constructing the sides of the puzzle. I was impressed that Mark, a debut constructor, was able to work in some great long entries like ALOHA SHIRTS, COLOSSAL, and PURITANICAL, without resorting to that much crossword glue. Yes, IN LA and REMAT are not good, but those are minor prices considering how tough those sides must have been to construct.

I would have loved for ALUMINUM SIDING to be one long entry, as it felt inelegant to split it up, but to do that, Mark would have needed a matching 12-letter entry. It would have forced the puzzle to be more open; less segmented, as 12-letter entries are very inconvenient to work around.

On that note, I would have liked the puzzle to breathe more — it's very partitioned. It was smooth overall, though, and if I had to choose between smooth vs. good puzzle flow, I'd tend toward the former.

I thought about this puzzle a lot after finishing it, and that's a sign of an excellent puzzle. Great stuff, especially from a debut constructor!