I came here to post about A7, but I see it's already been discussed. That move is incredible. I paused the video when he said it was coming up, and I couldn't imagine anything like it. It's not the type of move that's in my search space...

I'm still in shock.

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be immersed

The God of Endgame - Lee Chang-ho [Legend Match 3]
https://youtu.be/dUK6BWxQN8Q

Mine is Lizzie as well. It found out that move in less than one second. Is it related to the display card? I run this in my another computer with cheap display card and it took much longer for Lizzie to found out.

a7 was in my search space, mostly because I paused the video for a minute specifically searching for something interesting to play. Actually, the move feels relatively normal to me, as far as tesuji go. I think if I still had comfortable enough main time in a game, I’d probably find it, just like I find a million other crazy attacks that don’t work. Then I’d be somewhat surprised when it doesn’t immediately end the game in one direction or another. What’s the saying, that an idiot’s mistakes and a genius’ masterpieces look identical?

But really, finding the candidate move just noticing that b6 and b8 are desirable places to cut, and making effective use of all the aji instead of just half of it. It’s a very western-chess style move. And once you find it, it’s not that hard to read out.

Sometimes I wonder whether putting effort into learning go as a study is really just putting effort into demystifying the magic. It’s fun to be able to find moves like this, but it was even more fun when I couldn’t find them and just had to let my jaw drop and marvel. Well, I guess it’s been the most fun to play tesuji in my own games.

Off to the next video!

I think that once the computer decides to look at the move, it realizes immediately that it's a good move, however this happens after a random number of playouts (somewhere between 2000 and 200000?). Of course if your computer has a good graphics card, it reaches 2000 -- 200000 playouts in fewer seconds than the computer with a bad one.

On the other hand, unlike Lee Sedol, LZ cannot find the tesuji 24 moves in advance

Weird, I've just tried a few times (restarting to make sure I'm getting different random number seeds), and LZ consistently identifies A7 at the best move within 5,000 playouts or less. I've tested with networks 157, 242, 258 and "bubbles-15" (the default with Lizzie installation).

Note that the policy network value for A7 is only 0.1%, so it should be a "hard to find" move. But the high policy moves all favour black by a large margin, meaning that LZ will search more broadly. So A7 gets a single playout quite early in the search. (Tip: in your LIzzie settings, change "min playout ratio for stats" to 0.01 so that you can see the moves that it glances at and rejects quickly.) However, the initial evaluation of that early playout could be low; it might take a while before LZ gets around to searching that move more deeply. And this can be affected by "blind spots" in some of the variations. Maybe it's similar to this example.

[Baduk Lecture 8] The difference between 3rd line and 4th line
https://youtu.be/afAlusHUWqw

[Pro Match Review] Oh Yujin's Aggressive Play (Cho Chikun - Oh Yujin)
https://youtu.be/Uyi1k8gJyRs

The reason why strong players don't play knight move (All About Aji 2)
https://youtu.be/4ySexrPZBt4

Getting into 3.3 after Opponent Defends the Corner with Knight Move (All about corner 4)
https://youtu.be/X343XBVaD9k

Go Seigen and his New Beginning (Legend Match 4)
https://youtu.be/1Zw8-FLk_3g

[Pro Match] Choi Jeong and her overpowering reading
https://youtu.be/1narIntO5uw

What is the purpose of white? - Learning efficiency from joseki
https://youtu.be/UJvFy8mK1Tg

The aji after the most basic joseki [After Joseki 2]
https://youtu.be/wEIkJpeWDNo

[Haengma 1] The deep reading behind this one-space jump
https://youtu.be/gMQJUoqER8Q

[Baduk Lecture 9] The purpose of Peep - Kobayashi opening
https://youtu.be/iTXJh8kDFO0

Everywhere is Tesuji - How to apply tesuji into actual games!
https://youtu.be/cvmWsQpXn0E

The reason why white cannot pincer first - AI gives us new tactics!
https://youtu.be/3v8Wt6WiEPM

The reason why strong players are not afriad of cutting [After Joseki 3]
https://youtu.be/2U-TppahSC4

[Baduk Lecture 10] How to deal with the push and cut after joseki [After Joseki 4]
https://youtu.be/YF5nG1NwZys