Episode #63 Magic one space jumps
Hey everybody. Today we have another lecture made by Cho Hye Yeon. It's one in a series of ten, about tesuji's!
And to celebrate our one year anniversary, this episode will be about the one-space jump! Nice.
Let's start with this position. It's black to play. What would you do Peter?
So black's aim is to rescue his two stones, right? Yeah.
And to kill white's five stones. Really? To kill them? Yea I think that's the idea of the problem.
Very surprising. So I would maybe play the one-space jump!
Oh man, you're too good. Let's check out what white does now.
When white extends here, it's very easy for black.
Black has a nice throw-in and white has a shortage of liberties. So white is captured.
Right. But can't white do better? Yes, maybe white can play here instead?
Right, but then maybe black can create a connection.
Like this? Right.
This move is also very nice. White can't capture the single black stone because black can descend.
Oh and black has one liberty more, because white can not approach at [A]. That's self-atari, that would be a very bad move.
Right. So how about another move, this ugly looking shape? Is that something to consider?
Yes, this is the best white can do because he takes away one liberty of black.
But we will see that this also doesn't work for white, but black needs to be very careful.
My first idea would be to connect here. That would threaten to throw in again.
However, black can't throw in, because black has a shortage of liberties.
And this would be a self-atari. Right. Bam! That's horrible!
So this looks good but it is not working. What about this bamboo shape?
Right, that looks like good shape.
Ofcourse white will defend and maybe now you can jump, to connect?
Ah, but again black has a shortage of liberties here. Oh yes. Black can not connect because then white will capture everything.
How about giving atari first and afterwards connecting?
Ah, let's see.
Oh, this also doesn't work, black is dead again.
Because white can extend here.
So black did something wrong. These two don't work, so what about this one?
Ah, this looks good, and afterwards black can maybe connect underneath?
Yes, but be careful. Don't play this atari. It's not good because you take away your own liberties.
So it's better to jump here, another jump!
Yeah nice, so two one-space jumps in one problem!
Really cool. And if white connects, then this looks good, but it's actually wrong again.
Ah, white can throw in. Yes, white has a tesuji like this.
And after this white is very happy.
This looks like good shape, but this is the proper shape. The vital point.
It prevents the throw-in by white and white is captured like this.
So let's see the right variation one more time.
First black jumps here.
The best white can do is to take away black's liberties.
But black can play this empty triangle shape and then jump to the first line again.
Very surprising. Yeah, nice problem.
Let's have a look at another surprising problem.
It is black to play and black has some aji left in his two stones.
What about playing this kosumi on the second line?
Right. This looks interesting, but white has a lot of liberties.
And black can't make that many liberties. So white will actually win this capturing race.
I see. What can black do instead..So instead black should try something which makes miai of capturing the single stone at [J3] or to connect to the left side.
Ah, jumping again maybe? Right! Jump to the first line!
This creates a miai situation. When white blocks on the left side, black will capture the stones of white. The cutting stones.
With this throw-in that we've seen before. And a lack of liberties.
So this makes very nice use of the jump to the first line.
So blocking from the left side did not work out for white, how about blocking from the right side?
Maybe black can connect like this? Right. This is a monkey jump which connects all of black's stones. So black is very happy.
Cool! So this is another problem with two jumps! Right.
And what if white plays like this? Ah, this was the difficult one right? I think so.
But maybe black can again jump? Oh, does this work? Yeah, you're right.
This is easier than the previous problem. Very cool. So let's go to another one.
What about this one? Black still has aji in these two stones aswell, that seem to be captured by white.
So the problem is to kill white? Yes. I see.
This looks like a proper move. Right, now white has no eyes in the corner.
So white should try to create two eyes on the lower side.
But this looks dead, right? Yes, but, white has a nice move available.
Wow, that's tricky. And black can not connect his stones now. Right!
So white is alive. Very nice.
So this is wrong by black, and again the correct move is (you can guess by now): the jump!
Ah, what will happen now? If white plays here, then black will take away the eye. Right. So white has only one eye and he's dead.
And instead of playing here, if white takes the eye on the other side, then black can connect by playing here!
Wow, nice! The same type of shape that we just saw in the other problem. And it's also a good empty triangle.
Remember the episode we did about good empty triangles? Yeah, we are collecting good empty triangles, so we put it in the jar of cookies.
Hm! Hm! Hm! Hm! Hm! Yummy!
Let's quickly jump to the next problem.
There are five white stones here that are marked, and they can still be captured. Do you know how?
How about taking away a liberty of white. Yes..and I would extend upwards here if I were white.
Right. But maybe black has a nice net available?
With this keima. Hmm, very nice.
White has to be careful now. He can still get out, but if he plays here then he tricks himself. Because black can play here.
And afterwards this is a wonderful, wonderful move.
So this looks very interesting, but what happens if white just captures?
If white captures then he will have a lack of liberties. Wow, what is this? Looks absolutely crazy right? But it works! Check this out.
White can still give atari and go out it seems, but this atari is really strong!
This is magic!
And a throw-in. This is, well, let's call it a cookie, for the jar? Hm! Hm! Hm! Yummy!
So, to go back, this cut did not work out well for white.
How about this kosumi? This looks like good shape.
Yes. But it also doesn't work. Because like this white is captured.
So this means that if we go back even a little bit more, the extension that feels natural, that I would play in the game...
..This one. Yes, this is wrong.
White should play this instead, it's the correct move. Like this white can escape.
Black can try a net, but white simply walks out and white can escape with this empty triangle.
Another good one! For the jar!
Instead of this net, if black tries to capture here, then white also simply walks out and has a nice clamp available here.
Oh, this is a cool tesuji.
So this move does not work, it's very complicated. But, what about this one?
Yeah, this looks dangerous for white. White will start with this hane. This threatens a ladder, so black can't cut here because the ladder works for white.
So instead black will block here, but white has this nice move available.
When black blocks here, white can push out. And if black blocks then white can simply go out. So white succeeds.
So this proved to be wrong for black, which looks natural. This also looked dangerous for white, but it also doesn't work.
What about this jump instead? Yes, this would be my first idea actually. Looks like a shape point.
However, white can move out again with an empty triangle. For the jar! Our jar is getting full. I like it! Lots of cookies! Yummy!
But what about this net? It doesn't work because white can break through.
Like this. Ah, right.
So we've seen that this hane doesn't work, this jump doesn't work, this jump doesn't work..and ofcourse the one-space jump is always right!
A wonderful move. White is captured after this. This looks surprising to me because it's so far away.
Yeah, and white still has three liberties, and he can jump out maybe..
This ofcourse doesn't work, it's too easy for black. After this black has 3 liberties and white has 2. So black wins the capturing race by one move.
But maybe white can jump out like this? Yes, this looks creative, but black has this shape point available.
And white is captured. Nice.
So what about this jump for white? Yes, this hane looks very good and strong. Looks like white is going out right?
Yes. Wow, what is black doing? Yeah, black creates a lot of cuttingpoints for himself. But the surprising part is that there is not even a ko for white!
Oh, it's a double ko! Right, so if white captures, then black captures all of it.
If white tries to play the ko, and makes a ko threat and black responds, then black will simply capture the other ko. And white can't capture this stone.
Because he will be captured himself again. Yes, so this is very surprising. That all the cuttingpoints made by black did not provide enough leverage for white to get out.
But how about instead of creating this weird ko, can't white cut immediately?
Yeah, this looks like it will also be a ko, but..wow..look at this, crazy! What is this?
After this, black can play atari and white has a lack of liberties. Right, white can't connect. So if we go back, this also doesn't work for white.
What about this jump? This looks easy, can't black simply play on the vital point?
Yes. This is a very nice move. And this will create a snapback, because white takes, but black takes everything back immediately.
Let's quickly see one last variation. When white plays this kosumi, black can play on top of it. And this also leads to a shortage of liberties for white. White can capture a single black stone, but black will capture the rest. White can't connect.
Very nice. So the one-point jump was a really good move.
Yeah, it's shining here.
Another example. It's black to play again. It looks like the two stones on the left are captured. They're outnumbered and white is surrounding them.
But black has a tesuji..
There's still some cutting-weaknesses in white's position.
So we now know that the jump is a great move. So let's jump! Yeah, that looks great.
If white plays here it's not good for white and black will kill some stones.
With this hane white is dead. But instead of this, white can play here now. And actually the black jump doesn't work.
It is surprising how often this empty triangle is good after the jump. Maybe we should remember it. Yes!
Like this white can come back and fix all his cutting points. And black is dead.
So the one point jump did not work? No. First, in this case, black should cut.
And then cut on the other side. After these exchanges, black should jump. This is the correct sequence.
Wow, this looks crazy. It really does.
So now there is miai at the top and the bottom. If white rescues one of them, then black will take the other one.
White can not play atari here, because it's self-atari again.
Let's see that. Bam! Hatsa!
So how about the empty triangle, that's always a good move right? Right. Let's put it in the jar. But in this case, let's throw it out of the jar again, because this is a dirty empty triangle.
Ah, white can not escape. Let's not eat this cookie.
So cutting for black was a good move. So the right solution for black was first to cut here and afterwards also here and lastly jump to the first line. This is a great tesuji.
Let's see another position. The left side is a problem.
This looks very symmetrical. Yes, and there is a saying that if there is a symmetrical position, you should always play in the middle, right?
Ah, now we know the answer already. Let's jump. Bam!
This looks absolutely stunning. I would never play this in my game. No, true. But it makes miai of cutting at the top or cutting at the bottom.
So let's see what happens.
Black can now link up on the first line, like we've seen a couple of times before.
This one is pretty complicated, but let's just see what happens.
Black has a bit more liberties than white. Or one liberty more to be exact. And can just start taking away liberties of white. Nice.
So white should not play here. What about this one?
Yes. Again it's a matter of liberties, so let's see.
Black is one step ahead again.
And after this, again he wins by only one liberty. This is quite surprising.
If white does not play here, but plays on the other side, then black will also cut on the other side, because it's a symmetrical position.
We hope you liked this episode about this jump. And we will see you next time when we have another tesuji available.