Baduk TV English: Level Up to 3 Kyu: Lesson 28

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 28.

Lesson 28

Video: Level Up to 3 Kyu: Lesson 28

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Transcript of the video

Translated by Oh Chimin 7d

Edited by David Ormerod 5d

Episode 28 - Life and Death III

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

How have you been finding our practical life and death problems?

Have you improved your sense of aji in corner?

If you've been feeling more concerned about potential invasions in the corners, that's a good omen.

Let's explore some more today!

This is our first problem.

After this knight's move enclosure, black needs one more move to complete the corner.

This kosumi is the most common choice.

Sometimes, people choose to play a knight's move here.

If you've worked hard, the corner may look somewhat insecure.

What can white do there?

And how should black respond to white's invasion?

In the corner, there are certain positions which are very solid like this.

In most other cases, this 3-3 invasion has strong aji.

What's the intention of this move?

Ideally, white should live in the corner, or sacrifice it for some other profit at least.

Many players play here as an asking move.

Black can block on either side.

However, this kosumi is a good move.

In response to this wedge, white plays a tiger's mouth, as we learned.

If black attaches here, this empty triangle move is sente.

After that, this move at 2-2 is vital. Remember that!

White's alive. I suppose you know already know that by now.

Therefore, blocking here isn't the best choice.

White can live in the corner.

How should black attack this stone then?

Don't forget this kosumi!

Do you remember the position from the last lesson?

When black's very thick, this is the strongest response.

This situation is similar.

Since it's symmetrical, either kosumi is ok.

However, you should expect white to slide here.

And you'll need to be prepared for this cut.

Before that, white would attach here first.

In response to black's hane, this tiger's mouth is the best answer for white.

After this jump, this placement is vital.

White can't live on the inside.

As we've seen before, this cut is a strong resistance.

If white hanes here later, black will be in trouble.

So this jump is necessary.

Then this connection is a forcing move.

If black tenukis, white can throw in and capture this stone.

You might wonder whether black can survive by crawling along the second line.

Of course it's very bad.

In addition, white can capture black's stone by playing here.

Black can't connect, because white can atari here.

So black must jump.

Where will white play after that exchange?

This wedge is quite tricky.

After that, it's hard for black to answer.

If black ataris, white connects and these two cutting points are exposed.

Black can't manage both of them at the same time.

To state the conclusion first,

This 3-3 invasion is actually quite nasty aji now.

This kosumi is the only possible way of attacking.

However, it works only if black has a stone around here.

In this case, black can capture white.

Let me explain that once again.

With a double knight's enclosure, there's always aji at 3-3.

Remember this!

This kosumi is the only way to capture white, but there's one condition.

Black must have a stone around here.

And there's one more thing.

What should we make of nearby stones like this?

They'll make the aji stronger.

Let's move on to our next example.

Have a look at this position.

This kosumi enclosure is played very often in actual games.

Compared to this position, black's corner is more secure.

If black can continue to expand the moyo, this extension is good.

So he can enlarge his area.

In addition to the corner, black's framework is large.

Because of that, white should approach earlier.

In doing so, she can limit black's potential.

We often see such an approach in our games.

At the same time, white can aim at the aji at 3-3.

Blocking here is common.

But white can still take advantage of the aji with this hane.

This kosumi is a nice move.

You should remember it.

If black captures this stone, white pushes here.

Then black has no proper answer.

To capture white, he needs to block here.

But white will cut, then black must save his stone.

White can fight, but she can also save the corner with this atari.

This group is now safe.

White lived easily in black's corner.

White needs to consider the placement of her surrounding stones, but that's the basic aji.

It works because this kosumi is a great move.

Remember this combination.

What if black blocks here?

White simply plays a tiger's mouth. It's a ko.

How about this placement?

In this case, white can push first.

When there's a stone here, white can also connect here.

That's because the external stone helps white's group.

After this exchange, white hanes here.

This hane is hard to see though.

This move works only if white has a stone around here.

Thanks to that exchange, white can make a ko.

Black needs to play here to start the ko, but it's very risky.

If black loses the ko, this cutting point will become a critical weakness.

Remember the proper answer to this placement!

When white has a supporting stone, she can connect immediately.

Because white can resist with this hane.

If sacrificing this stone is ok, you can play like this.

I think this result is fine too.

When white has a few stones on the side, there's some aji in the corner.

When black blocks here, the hane and kosumi are a good combination.

Now let's look at some other options for black.

Where else could black play?

We saw white's combination earlier.

Because of this move, black can't capture white.

In other words, this kosumi is a vital point.

What if black plays at the vital point?

As you know by now, white will play a knight's move here.

Then she can push and cut immediately.

To rescue black's two stones, this atari is necessary.

After that, white blocks here.

Subsequently, connecting here will be sente.

So black has to defend somewhere around here.

If white plays here, the corner is safe.

Remember white's life and death status in the corner can differ depending on outside liberties.

This is a big difference.

Locally, this attachment is a vital point.

However, when the liberty isn't filled, attaching here is a great tesuji!

If black plays here, it's seki.

What if black ataris like this?

In that case, white sacrifices her stones, which is an excellent idea.

Black has no choice but to capture them.

Then white recaptures.

Black can try to connect under,

But white can atari and capture these two stones.

So white's alive.

Suppose black connects here.

White still has to connect. What's the difference then?

In this case, white can't attach here.

Because white's outside liberties are filled, white can't capture black's two stones like before.

So white has to hane instead.

Black can descend here in sente at anytime.

But he needs to spend several more moves to win this ko. This is called a 'ten thousand year ko.

It's a symbolic expression though.

Even though white's group isn't completely alive, it's more or less safe.

Therefore, black still can't capture white with this kosumi.

Since this point is sente, white's alive.

Also, if black jumps white will play here instead of connecting.

Now there's no aji in the corner.

Remember this move too.

If black extends instead, white should block here.

He can push and cut, but this move is safer.

White can still aim at this cutting point.

In response to this hane, white can now block.

Capturing this stone will be sente, and this push and cut is a strong aim.

In conclusion, black still can't capture white.

What are the implication of these variations?

Even though black's corner looks secure, white profits by invading at 3-3.

To prevent further expansion of the corner, white needs to approach like this.

And this aji is another aim.

Over the last few episodes, we've looked at many variations related to the 4-4 point.

Even if one spends many moves, there's usually still aji at 3-3.

I advise you to remember the useful variations we've learned!

1 Minute Summary

Today we've investigated the aji in black's 4-4 point enclosure.

We discovered that the 3-3 invasion is almost always annoying.

That's true. It's quite nasty.

So you should be fully prepared for your opponent's schemes.

Anyway, you learned a lot about how to defend your corner!

And, on the other hand, you also learned how to invade your opponent's corner.

Next time, we'll explore reductions, as well as more life and death problems.

Thank you!

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