The thread could be retitled -- a4v14 (#104)
I cracked it, today.
I was lucky.
I hated these four puzzles (a4v12, a4v14, a4v15, a5v16. or 104, 105, 106, 107).
I have had these last four puzzles waiting since Nov or maybe Oct 2020.
For whatever reason, I started with a4v16 / 107. I struggled and struggled. I contacted a friend who heard me vent, and eventually, I realized the issue I was having. I solved it shortly after correcting my mistake in logic.
I went to a4v12 / 104 next.
Not easy, but now there was a method to my madness and I eventually solved it.
Then I decided to the one everyone complained about -- a4v14 / 105.
I was lucky. My method worked and I lucked out by choosing correctly which blind alleys to go down.
I have one left, a4v15 / 106.
Not looking forward to having more negatives in the play.
I hope to get it solved BEFORE Patrick releases a new volume.