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Instead of defending here, white can also consider defending the lower side.
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However, this is actually quite small because black has very good endgame here.
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White's territory is not that big.
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It will be reduced greatly.
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The last possibility for white, after black plays [here], is to simply play tenuki.
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However, this leaves a very big hole here.
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Black will invade, giving white a very hard time.
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Black continues at A, B or C to handle the situation.
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White has a very thin shape.
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So now we've seen that this is a bad move for white.
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How about approaching from [this] side?
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This one?
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Yes.
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Yes!
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White can also approach from here.
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Black answers normally.
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But now this is a very big point.
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And this is the reason why Lee Changho chooses to play [this move].
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Ah.
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He doesn't want to get under pressure as white.
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Right.
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So let's maybe first have a look what happens when black [doesn't] play like this, but plays [here], this is the normal move..
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It's also a possibility, however, it gives white the chance to choose between the normal joseki - playing at [A] - and approaching the corner at [B].
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This would be normal but now white can also play [here] to strengthen his own group in the lower left.
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And to attack the black group.
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So this would be a nice move.
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So that's why black [doesn't] play here.
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He doesn't want to give white the chance to play [here].
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So black attacks, himself, immediately.
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And this also puts pressure on white's group right?
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Right!
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Black has two ways to answer to this invasion, which is the only move for white.
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In this situation, this is a nice move.
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Oh!
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We have not seen this one before, right?
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Right.
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So white needs to link up.
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And black will play on top.
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So black also links up.
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And black seems to gain a lot of thickness on the outside.
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After black makes this thickness, maybe white should go out?
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Right.
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White needs to go out here.
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And these are good moves because if white omits [this] move.. .. then black will play this move.
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Ah, and it will become sente aswell.
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Because white still needs to live.
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Yes, white's group doesn't have two eyes yet.
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Also, black gets major influence here.
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It's too good for black.
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So instead of going up here, which was one possibility, black can also choose to play [here]..
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However, we added a few stones..
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Black needs to have a stone at [A] and at [B], but the stone at [A] is crucial because there will be a ladder.
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And if black has all these stones, then [this] will become a very powerful move.
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Black can cut here and then link up on the 1st line.
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And white can not capture the [triangle] stone, because the ladder will be good for black because of the stone at [A].
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How about when black does not have these 2 stones in place..
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When black [then] will play this move.. .. white can link up his stones.
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[This] ofcourse is not a good move.
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It's very ugly shape.
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And white will be in trouble.
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But instead of this, white sacrifices one stone.
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And connects underneath.
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Since white didn't have big territory in this area anyway, black didn't gain much in these exchanges.
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Let's see another overall board position.
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Here white has nice shape on the lower side.
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[This], in this case, is an excellent move to expand white's framework.
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After black calmly answers.. ..he can later aim at this point.
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Which is the weak point of white's shape.
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Instead of calmly answering, if black plays tenuki, white can play [here].
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This is the sente move that white can use in a lot of situations.
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Black has to respond and now white made himself a little bit stronger in the area.
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White also has a move available which is [gote].
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This move was [sente], but when white will play here it is [gote].
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However, it has a better follow-up.
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So black will not answer this move but afterwards white can take away all the territory of black in the corner.
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And gain a lot of thickness on the outside.
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Black will have to live very small.
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So when you're white and you play [this keima], it has some benefits but also some demerits.
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Because it is a [gote move].
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Let's have a look at another position.
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White can also approach from this side, instead of playing this keima.
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And this is also a good move to make the lower side more solid.
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Especially when the white shape in the lower side is good.
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Playing like [this] will make the white territory solid.
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So this is a mistake by black.
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White is happy.
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Instead black can consider just playing [here].
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This is a move that we've seen before and it's quite simple but effective.
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After this black can take sente and he can flatten white.
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Regarding the joseki in the lower left corner, this is a [vital point] to reduce white's shape.
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This is standard way to make shape for black, we've also seen this before.
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Now let's finish with a kind of fun move.
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Let's have a look at this one.
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A tricky move!
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Yes.
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The idea is ofcourse that when black extends here, white can cut.
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He was dreaming of this!
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Yea.
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This is beautiful for white.
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So instead black can try to capture the white stone.
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