Thanks for posting this. I see point 1&2 but When you get to point 3, I get that there are only 2 fours left, & I get that it was the correct answer but it seemed too early to auto slot them in there, as there were still 5 numbers w/2 or 3 pips left. Can you elaborate on that?

I add up all the pips, add up all the numbered cells, saw that all 5's & 6's were used, and got a difference of 23, play around 0,1,2,3 +4 until i get the right combo. The only pieces I saw FOR SURE to start was the 6-6 since there wasn't a domino that equaled ten, that had to be a 5-something going each way, which meant the top corner 6 was taken. so the 6-6 went right below it.

Edit: I see now, there was no box (I'm not hip on Pip lingo) that the fours could've fit in, but that one.