Thank you everyone for your contribution!
Indeed I was (and I'm still) busy in real life, agreed that it seems somewhat discrespectful for not replying on time.
Could've spent a few days figuring it out myself, but then I thought it may be better to post it here -
after all the task is related to a bit challenging list manipulation, while I knew I could rely on some of you.
Personally I don't get mad at the times when I provide a solution to an non-replying OP (like in this thread) rather just letting it sink in the web.
Surely I had the time to reply with just "thanks", which would seem more rude for me instead of non-replying -
because its like someone hands you a cigarette: while for a quick question it might be ok, for an algorithmic solution its not.
BTW I do code in my free time as an aside hobby (not making any $ out of it, but maybe as a part-time draughtsman - which is still not alot),
so not solving anything particular for a client - its more like a self-development thing.
My grid is max around 12x12, but we all agree that more and faster is better.
...nobody dropped the million dollar question for the potential usage of this sub.