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Black plays high here on the 4th line because he already has a low stone at A on the 3rd line.
This makes a good balance.
In go you often want to try to make waves.
Maybe also in other things than go, but waves are good in go.
One stone high and one stone low.
After this, this jump for white is a nice point.
If white does not play this move, then black has a nice combination.
White peeps here but black does not connect, but tries to make his framework bigger.
Black will use the combination of 1 and 3 to also flatten the lower white side.
White can't play the hane at A because this move for black, [A], is always sente because black can capture the white group at [B].
Let's have a look at another position.
When white already has the [A] stone in place, it is not good for black to push up here.
Because this will help white to become stronger at the lower side.
White will hane here and black has a weakness at A to worry about.
He still has to come back.
Instead, in this kind of position, there is a surprising move which is this one.
This is a very nice and solid move for black.
And can be played without fear.
Next black can aim to play at A or B.
It's more or less a miai situation.
If we go back a bit to this position, we saw that white can approach the upper right corner.
But white can also use this aji.
White can approach here, aiming to play at A later.
Playing here starts a bit of a complicated variation.
Let's begin with the simple variation first.
That's just playing simply here.
This is a very simple and clear move.
It's a little bit crude, but after this you can play tenuki as black.
So this is certainly possible for black.
However, [this] starts a bit more complicated variation.
White has 2 options after this.
White can either play here..
Or..cut!
Let's have a look at the cut first.
Black has to reinforce for his two stones, and white extends...
And after this white can jump.
Mind that white does not have to make the exchange of [1] for [2], because it is sente anytime.
So black can not cut white.
What we mean is: when black tries to capture this stone..
White can simply push [here], and when black defends..white can connect in sente.
Instead of [this] move, white can also take it more easy and just extend.
After this hane it's very tricky and black has to be careful.
If black plays the cut now, he makes a mistake.
White will force black into a bad shape by playing atari here and then blocking on this side.
This block becomes sente for white, because otherwise white will go through at [1]
White got very strong on the outside.
So instead of cutting immediately, first black has to push.
If white extends, black will cut anyway.
This is good.
Instead of pushing here, white can also play the hane.
Black will answer with this strange move.
Eventhough it's an empty triangle, it's a good move because A and B are miai.
When white defends here the cut works again for black.
And if white protects the cut, then black will create some aji in white's position.
After this it's not urgent for black to save the 2 stones.
Black will play on the second line.
If black omits this move then white can play [this] move and destroy a lot of black's territory.
When white plays [here], we've seen that black plays the keima.
But if black plays somewhere else, white will approach this corner.
It's a nice placement for white.
This is why [this] is a good move for black.
When white approaches here..black is a little bit cramped.
White will play on the second line here and white is happy.
Black feels under pressure.
In [episode #5 Payback time] we've seen this shape.
If black plays hane it's a little bit dangerous.
White has this tough spot.
After this white will hollow out the corner.
And black is in a lot of trouble.
So instead of playing the hane it's better for black to just jump away.
However, black doesn't have a solid base.
Check out [episode #5] if you're interested.
Now that we have seen what happens when white plays [here], let's have a look at [this] move.
Why is this such a bad move?
It's quite surprising that it's bad because it looks like white is doing good moves, and he's making territory.
Yes, the lower side looks quite nice, right?
Right.
But black has [this] move!
It's a painful invasion.
Black can still live inside white's territory.
Black can live because he has [this] aji.
This helps a lot in combination with the black stone at [A].
Let's see how black can link these stones.
Black destroys all of white's territory and is happy.
How about jumping to here?
Yea, it looks like a solid or strong move.
But in fact it's not good.
[This] move is very urgent because it prevents white from invading at the 3-3 point.
If white plays here to protect against the invasion, black will play like this.
The [shoulder-hit] is the [vital point].
White is flattened.
After black got the lower right corner he also succeeded in reducing white's framework.
This is ofcourse good for black.
Instead of defending here, white can also consider defending the lower side.
However, this is actually quite small because black has very good endgame here.
White's territory is not that big.
It will be reduced greatly.
The last possibility for white, after black plays [here], is to simply play tenuki.
However, this leaves a very big hole here.
Black will invade, giving white a very hard time.