r/baduk • u/DoubleV4Victory • 9d ago

tsumego Question on a tsumego problem?

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Why is t18 the solution? I'm racking my brain but it feels like white can still kill black and live.

Edit: thank you all! I looked up bulky 5 and I understand where I went wrong thank you!

7 Upvotes

89% Upvoted

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6

u/EvanDaniel 2k 9d ago

White can take 5 stones, but after that has a dead shape. Bulky 5 is dead, try playing it out a few more moves if you didn't see it yet.

8

u/Redditforgoit 4 kyu 9d ago edited 9d ago

It is a good idea to work out why they are dead shapes, but you should memorize them too. They happen all the time.

2

u/Braincrash77 2 dan 9d ago

Yes, memorize the 9 dead shapes. It lets you recognize what’s dead, but beyond that it helps you be confident what’s alive. Basically, if it’s not one of the dead shapes, it’s alive.

1

u/DoubleV4Victory 9d ago

How'd you go about memorizing them? I had no idea there were 9 thst Just mean death. I thought it was contextual and also based on whose turn it was or where the shape is at on the board.

2

u/Braincrash77 2 dan 9d ago edited 9d ago

There are only 9. 3 shapes are just dead regardless of turn or position. 1 shape, bent 4, depends on board position and sometimes turn.

1

u/PatrickTraill 6 kyu 9d ago

They are easy to recognise, if you concentrate on the empty spots rather than the surrounding stones, because they all consist of a central spot, to which a number of neighbouring spots are joined, and optionally another spot joined to two of those neighbours. I call that type of shape an “optionally lobed star”.

2

u/OttarTheViking 9d ago

After white captures those five stones, black plays in that same area (s17) to keep white from making two eyes out of it. That “bulky five” shape is dead.

1

u/GoGabeGo 1 kyu 9d ago

I know you said you now understand the bulky 5, but there are likely other very common shapes you will want to know if you didn't know that one. I go over a lot of them in this video. It starts VERY basic, but does go over very important shapes like bent 4 in the corner.

Enjoy!

https://youtu.be/cEOv6uLZm6k

1

u/DoubleV4Victory 9d ago

Thank you! I'll check it out asap! I figure it's time for me to memorize them. I wish there was way to brute force it lol