Pentengen - playing the middle of the pentagon:
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One you see something once, you see it everywhere!
Here’s one in So–Kondo 2020, a 9p vs 1p game detailed in Fairbairn’s article on L19.
I agree with John that So Yokoku’s opening as Black was very simple and instructive.
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I think this looks like a pretty tuning fork!
I can even recognize a resonator 
(game still in progress, please don’t comment the game)
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(vs 7k)
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I think it’s a product of reviewing many, many GoKibitz DDK games in which good cuts weren’t taken (I had to take a mental health break just this morning when I found myself commenting simply “Take! The! Cut!” to a hapless 13k) but, even though jlt and I are about the same level, I can’t myself ever missing this White to play solution.
Nice, I found this one as well:
Seems like I won’t have to return my SDK card yet.
I found a hammer in dfan’s study journal.
dfan’s opponent invaded his centre in a mid-SDK game at the 2018 USGC.
He comments
Black ended up making a ko that let him connect to the bottom, but I got more than enough compensation and was already up by about 20 when he made an endgame blunder and resigned.
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Toothpaste shape
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Interesting that the toothpaste shapes shusai is the master of, the bot at Dan level support can’t keep up with it.
It’s like it thinks Black is winning, there’s a tonne of blue moves, lots of positive changes in score like +4, +0.5 etc and then it realises Whites better.
Katago vs Shusai would be an interesting game 
More than 1000 playouts needed
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Here’s a pro commentary on the Shusai Karigane classic. translation of a 9d pro commentary • Life In 19x19. And yes low playouts KataGo of course struggles with it. I’ve seen some high playouts analysis somewhere.
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But why? It nicely removes an empty triangle!!! 
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From a whole board 13x13 game, I give you “the rat”:
Still don't see it?
How about now?
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And here we have “the steam-boat”:
Black stones are the water and the chimneys, white stones are the boat and the smoke:
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When stones start to touch a lot, like when closing boundaries, shape is much less a thing.
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A rat escaping the trap
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