Baduk TV English: Level Up to 3 Kyu: Lesson 29

Level Up to 3 Kyu is a Baduk TV series designed to fast track single digit kyu players to 3 kyu. The presenter, Lee Jihyun, is a 3 dan professional Go player. This is lesson 29.

Lesson 29

Video: Level Up to 3 Kyu: Lesson 29

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Transcript of the video

Translated by Oh Chimin 7d

Edited by David Ormerod 5d

Episode 29 - Life and Death IV

Hello everyone, welcome back to 'Level Up to 3 Kyu'. I'm Lee Jihyun 3p.

Today, we're going to look at reductions and life and death problems derived from them.

Reduction is a very useful skill in Go, so you need to study it carefully.

Let's begin today's lesson.

We're going to investigate life and death problems and reductions at the same time.

Here's our basic formation.

We see this quite often in real games. Black enclosed the corner and expanded his moyo.

Later on, this kosumi is a very good move for black.

We learned about this formation last time. Black can enlarge his moyo easily and efficiently.

Therefore, white needs to prevent that.

He needs to invade somewhere to reduce the moyo.

How about this approach, which is well known to us?

In this case, black will attach first.

Normally black plays here next, but in this case he already has a stone there.

In addition, there's a stone here, where white wants to extend.

And moreover, it's black's turn now, so he can attack white very severely.

Black is very likely to develop a good position by attacking.

This white group will be floating without eyes.

Because of that, this approach isn't a good idea.

White needs to come up with another ploy.

That's what we're going to study today!

Let's look at this attachment, which is a wonderful move in this situation.

In response to this attachment, black has two possible answers.

Black can choose between these two moves.

Let's try this first.

It looks softer than the other hane.

White extends here, and black descends in the corner.

After exchanging this push, white extends here.

Black jumps and white jumps too.

Black got the corner and exchanged this jump in sente.

In contrast, white successfully reduced black's moyo and made a base.

Compared to the knight's approach, this variation is a lot better.

So, if black hanes here, white will settle down on the outside.

When we learned about fuseki, we studied a similar variation to this.

Shall we see black's other answer?

Let's investigate the other hane.

In general, this move aims to develop influence.

However, black can also gain territory in the corner in some cases.

When white counter-hanes, black can decide what he wants.

In response, black has these two basic answers.

Let's look at this atari first.

White has to come out.

What if black captures this white stone immediately?

If black insists on capturing, white will atari here.

Black can't rescue his cutting stone.

Therefore, this atari doesn't work very well.

Instead, pushing here takes a vital point.

After that, white should cut here and atari.

Then this push is a proper move.

Can white rescue the corner by blocking here?

Black will capture white's stone.

There's a vital point in this position.

This tiger's mouth is the answer.

Thanks to this tesuji, white's alive.

However, even though white can survive in the corner, it's a failure overall.

You may wonder why, because white lived and reduced black's territory.

But black's moyo is very solid.

In addition, black can attach here later.

All of these moves will be sente.

In other words, black can fortify his wall at anytime.

This moyo is flawless, so it's a failure for white.

White shouldn't choose this variation.

In this situation, there's no need to think of this move.

Instead, you have to push here.

Remember this move. If black extends, white can capture black's two stones.

So black has to extend here.

After that, white ataris and jumps like this.

We learned about this jump in an earlier episode. Many of the moves we saw earlier are related.

If black pushes, white blocks.

Do you remember learning this variation?

White has to connect here.

If black cuts, just sacrifice these stones.

In exchange, you can isolate this black stone.

Black could've built a large moyo if white hadn't reduced.

But white successfully erased black's moyo.

Capturing white's stones will weaken black's stone on the left. It's very bad.

So black shouldn't cut there.

He got territory, and white reduced black's moyo.

Since this sequence is kind of joseki, you should learn it.

Now we'll investigate another move; the connection!

Instead of taking the corner, black can gain influence.

This move focuses more on the left side than the corner.

In response, white has to connect here.

Black blocks, and white hanes and descends.

Up to here, it's a basic sequence.

In some cases black can defend here immediately.

However, what about the corner?

Is it safe now?

In this case, this placement hits the vital point.

After white defends, black should peep here.

Connecting here isn't the best move. Black will hane.

To rescue the corner, this hane is the only response.

Then this empty triangle is good.

After that, black hanes here.

It's a one step ko.

Black needs to win the ko twice to capture white.

Instead of the connection, this hane is safer.

After that, black makes an empty triangle.

If white connects, black hanes.

It's still a one step ko.

And black still has to win twice.

In conclusion, white isn't alive yet, because of the aji we just saw.

Don't forget this!

Does white have any alternatives to this counter-hane?

Let's see some other possible moves!

We're going to look at other ways for white to answer.

How can white play other than this counter-hane?

This extension is conceivable.

Blocking here isn't a good idea. If white hanes, black doesn't have a good response.

White will easily settle in the corner.

Therefore, black should extend, to threaten white's life.

White should play a knight's move.

After these exchanges, white has play a vital point.

This 2-2 move is the answer.

Basically, it's possible.

However, black can still harass white after this exchange.

This hane is severe indeed.

If we look closely, we can see that connecting here is sente.

If black plays here, white can cut immediately.

After this jump, white will cut again.

If black can manage these groups, he can play to kill white.

In that case, white's group will die.

Otherwise, one of black's groups will die.

So you need to read several moves after this cut.

If the cut is powerful, black should defend his cutting point.

Then white has to look after her group.

However, we need to evaluate the way in which white lives in the corner.

My answer is 'no'.

This is a failure for white.

Instead of defending here, black could attempt to capture white's group in some cases.

At the very least, black can choose between defending or trying to kill white.

In addition, black's position looks very good.

There are no weaknesses in black's moyo, so it's better for black.

Because of that, white doesn't extend here.

Instead, she plays here. This counter-hane is also possible.

Black should extend.

Then white plays a tiger's mouth, and black descends here.

After this kosumi, white can survive in the corner.

When white extends the result is clearly better for black.

But living in the corner like this is acceptable for white.

However, in terms of living in the corner, this counter-hane is still the best choice for white.

Why is it good?

What's the difference between them?

The shape is different.

Despite the aji I showed you earlier, black still needs to defend his moyo.

Otherwise, black's moyo isn't quite finished.

White has aji here, and she's also reduced black's territory more than other variations.

In addition, she got sente!

White should always try to live in the the best way possible.

So I recommend that you learn the attachment and counter-hane.

The extension isn't good. Instead, the counter-hane is a better move.

Don't forget these two choices!

Finally, you need to consider black's position and use these moves appropriately.

1 Minute Summary

We've been learning about reductions and life and death problems in the corner.

We studied this formation.

Even if black's enclosure is higher, white's reduction will be the same.

After white's attachment, black can choose between the two moves.

The sequence will also be the same.

So you know how to play in this position too!

Since these variations are practical, remembering them will be very helpful.

We've studied practical life and death problems over the last four episodes.

The next episode will be our last. I hope you'll look forward to it!

Thank you!

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