Logic Masters Deutschland e.V.

From the low rating of November
In the pit of very easy to solve
There came the YY in worn armor
Sing a poem poorly written
He had changed into many forms
With many different names
From six to nine
From double to single
From n sum to one step higher
And this it’s going to be the last change
He summoned his army of 81 soldiers
Yet they only had 9 different height
They gathered together in boxes of 9
Yet nobody in the same box
Can find a comrade of the same height
Then YY said,‘Formation’
All the boxes were stacked in a grid
He got confused
How could nobody share a same height
In every row or column
So order was sent
to find the longest ascending
Or descending tallness
In every row and column
And mark the highest sum of height
So he could use it
in the last fight
This is the last chance
to prove its worth
And it will be its last

Spoiler rules

you actually think I think you need the spoilers. Fine. It’s under the puzzle

the number outside means the biggest sum of the longest thermo, regardless of its bulb’s direction

There is always something interesting in its rules
It knows, and it wants to show
If he fails
Then prey that somebody will remember
That there is a YY
With a rule that connect two different grid
So special that made him too easy
And too easy to separate
It's made by Borescoper from China
May it be the last of YY everyone remember

I just don't have any more new idea on variant from YY, so it's the last. BTW, this author is famous for his story telling, so one of the three star is actually enduring the badly written poem.