(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Chinese]SZ[19]KM[0.00]
AB[pd][qp][oq]C[常形讲座 03/60 星大飞点33
吴新宇 六段
天元围棋

Common Shapes Lectures 3 Star point large knight's corner enclosure 3-3 invasion
Wu Xinyu 6p
tianyuanweiqi

https://www.youtube.com/watch?v=MR_DukGjK3k&list=PL9mIJo0rMVCNM5iMjWB_eu0KKExj-ZKcV&index=3

Translated by Daniel Hu 6d
20220928

29:04

Hello and welcome to tianyuanweiqi channel. I am Wu Xinyu.

This episode we'll continue discussing common shapes, continuing with star point large knight's follow up variations.]
;B[]
;W[qj]C[A common opening is star, small knight's shimari.

W wedges.

]
;B[qg]
;W[qm]C[Large knight's and making a base.
]
;AW[jc][dd]C[Of course, after the big move at the top has been taken by W, and B has a large knight, some common variations in this situation.

...

As for what variations W has to play, this is the research topic for today.

]
(;AE[qm][qp][oq]C[Of course, the right might be different, not necessarily a 2 space extension. We will leave it for now and ignore it.

As for the exact position of these stones, we will ignore it.]
;B[]
(;W[qc]C[W will directly point 3-3 if W plays first.

After this, how should both sides normally respond?

This is the variation that both sides should emphasise researching.

...

Against B's star point with large knight's move, the 3-3 invasion is a move that works and is the best we have found so far.

B has blocking outside or inside two ways of playing.

Blocking outside is the main line.

We'll discuss up to here today. Goodbye.
]
(;B[pc]C[B blocking is the easiest to think of.

...

In conclusion, when B prepares to block on the outside, the prerequisite should be to treat the right lightly and focus on the upper side. This is the prepared goal.]
;W[qd]C[...


Hence we must consider some methods for B. 

That is, when W crawls, B should hane as normal.]
(;B[qe]C[If B simple hanes, this is the most standard variation of the star point large knight enclosure. It can be called a joseki.

W lives.]
;W[re]
;B[rf]
;W[pe]
;B[qf]
;W[pb]
;B[ob]
;W[qb]
;B[nc]
;W[rd]
;B[oe]C[Because W extending here is very severe, B still needs to defend. This is the most standard variation.

As a joseki, it is even. But normally in this situation. W takes the corner in sente, making life, but although B's outside becomes very thick, because W has moves on each side restricting it, it is very difficult to make use of its power.

So locally, for B to choose the joseki variation, B cannot be satisfied. For W to reach this result, W has achieved their objective.
])
(;B[pe]C[One method is extending alone. This is relatively advantageous for B. ]
;W[qe]C[W's normal move is to crawl. ]
(;B[qb]C[Now B hanes on the 2nd line.]
;W[rb]
;B[pb]C[B's intention behind the hane connection is mostly to treat the right lightly and focus on the upper side.

To treat the rightly has a prerequisite which is that W's outside stone R10 is relatively thick.]
;W[qf]
;B[pf]
(;W[rg]C[W bumps, B blocks, W hane]
(;B[rh]C[B double hane is the local tesuji.]
;W[qh]
;B[pg]
;W[ri]C[W atari, B connects, then W ataris again.]
;B[lc]C[Now B has finished locally and can continue at the top.

That is, B sacrifices the territory on the top, and exchanges it for the top, allowing invasion later.

The advantage of an extra hane is to preserve two possibilities.

...

We can say the double hane is a good move.

Under what sort of situation should B play like this?

...

So overall, this is the relatively good variation for both sides. Of course, it is only played when W is relatively thick on the right.

Then B should treat the right lightly and move the emphasis to the upper side.

If W is relatively thin on the right, B can't choose this because if a thin group connects to the corner, all alive, B can't be satisfied. What should B play in that situation?]
(;W[]
(;B[ph]C[firstly B can atari again above.])
(;B[rf]C[Another is that during endgame, ]
;W[sh]
;B[rc]C[Cut. This is a standard endgame technique that everyone should memorise.]
;W[rd]
;B[sb]
;W[sc]
;B[ra]C[Because B is very light in this ko, W can't connect. Either W doesn't play ]
;W[]C[If W tenukis]
;B[rc]
;W[sf]
;B[sd]
;W[re]C[In other words, B can spend a move to capture W's stone in the corner.

This can be said to be an endgame technique for B.]))
(;AE[pb][qb][rb][jc][lc][pc][qc][qd][pe][qe][pf][qf][pg][qg][rg][qh][rh][ri][qj]AW[dp]AB[qp]
;W[]
;B[fq]C[A mini chinese opening]
;W[cn]
;B[kq]
;W[qj]
;B[qg]
;W[qm]
;B[pk]
;W[qk]
;B[pn]
;W[pl]C[This opening is very common among top players.]
;B[ol]
;W[ok]
;B[nk]
;W[pj]
;B[om]
;W[jc]
;B[cf]
;W[fd]
;B[bd]
;W[qc]C[After B approaches, W then points]
;B[pc]
;W[qd]
;B[pe]
;W[qe]
;B[qb]
;W[rb]
;B[pb]C[Although we've played many moves out, this appears often in real games.]
;W[qf]
;B[pf]
;W[rg]
;B[rh]C[Both sides play the variation we just mentioned.]
;W[qh]
;B[pg]
;W[ri]
;B[lc]C[This variation can be said to have appeared very many times especially recently, especially in the matches at the top level between the top players in China and Korea. If you are interested, you can look through some recent game records of top level China-Korea matches.

Returning to the subject 
言归正传]))
(;B[pg]
;W[rh]C[Just connecting, W retreats and next B doesn't have many advantages.]))
(;W[pg]C[When W is relatively thick on the right, W has another way of playing, to directly cut.

Their intention is to not crawl on the 2nd line and directly coming over on the 4th line, capturing B, then W's territory will be much bigger.

...

Given that W dares to cut, B has no other option that to fight.

...

Of course, if for players that like fighting if W is relatively thick, this cut way of playing does exist, and it doesn't appear in games, but overall, B doesn't need to fear.
]
(;B[og]C[Then if B ataris]
;W[ph]
;B[oh]
;W[pi]C[W is very satisfied compared to crawling on the 2nd line.])
(;B[ph]C[B's atari is a good move locally.]
;W[og]
;B[oh]C[B's relatively correct method is to atari and then push. ]
;W[ng]C[Because B is threatening to ladder, W can't touch this side and must extend.]
;B[rh]C[Then B tigers, a good shape locally, at any time threatening to tiger in S14 to  kill W.

...

Remember than if W cuts, B is to atari, push again and tiger. Remember this technique. Then B doesn't fear W fighting here. This is the correct way to play here.]
(;W[rg]C[If W wants to live unconditionally, W must atari this. This is very crude.]
;B[qh]
(;W[sg]C[To live unconditionally, W can only atari, B connects then W descends.

]
(;B[sh]C[Although W can live locally, it leaves a sente block for B later.])
(;B[nh]
;W[mg]
;B[lc]C[If W lives, B can first press and then extend. After this extension, B is already alive.

B has pressed many times on the other side and has the T12 block later, getting out is quite smooth, this is also somewhere where B doesn't fear fighting with W.]))
(;W[ra]C[If you descend here to live, ]
;B[rf]
;W[re]
;B[sg]
;W[se]C[B's capture is sente which helps the eyespace of this group greatly.]))
(;W[ra]C[If you only descend, then ]
;B[rf]C[Later B has the classic mouse stealing oil tesuji.]
;W[re]
;B[sd]C[This move.]
;W[sf]
;B[sg]C[W can only atari and B makes a ko.])
(;W[rf]C[If W only descends, this corner hasn't lived unconditionally.]
;B[ra]
;W[sb]
;B[rd]
;W[sd]
;B[se]
;W[rc]C[Later, B hane, W descent, B attach underneath, W clamp, B atari, W calls atari.

There is still a ko to kill which means that B doesn't need to worry for the outside fight.]))
(;B[qh]C[If you just extend]
;W[ph]
;B[pi]
;W[oi]C[W can forcefully seal you in. Although the variations next are relatively complicated, B's risk is relatively high.])))
(;B[qf]C[If W is thin on the right, B must bump in.]
;W[pb]
;B[ob]
;W[qb]
;B[nc]C[Tiger. This leaves moves to attack the right side because B still leaves some forcing moves on the right. 

...

But overall, we can say that in this shape W is relatively satisfied.]
;W[]
(;B[rg])
(;B[sf]C[Even moves on the 1st line.])
(;B[sg]C[It might be very threatening to W's eyespace on the right. ]))))
(;B[qd]C[If you feel that the other variations lose too much territory.

Blocking on the inside is mostly to obtain territory. The following variations are relatively simple.]
;W[pc]
;B[oc]
;W[ob]
(;B[nb]C[Of course, B must double hane. I think that everyone is familiar with this joseki.

...

When B double hanes if W doesn't want to let you take territory, then is B afraid of that?]
(;W[nc]
;B[od]
(;W[mb]
;B[pb]
;W[na]
;B[qb]C[In this way, both sides can be satisfied.

After W takes a ponnuki in sente, W has a lot of potential on the top.

This result can be said that B should choose this based on the surroundings. If W doesn't have much potential on the upper side, then this can be chosen to make territory. 

It is also a quite clear way for B to play.

If everyone thinks that you keep telling so many variations that I can't remember. When I play Go, I'm scared of complications, and prefer it to be clearer, then this diagram can be everyone's top choice. Normally it there isn't much room for B to make a loss.]
(;W[me]C[Later W can fly up if W is making a moyo to expand.])
(;W[nd]C[Or extend, both can be said to have profit.]))
(;W[pb]C[If W must take the corner, W can atari and connect.]
(;B[mc]C[B ataris]
;W[rd]
;B[re]
;W[rc]C[W then hane and connects to live. This is then a bit small of a life.]
;B[le]C[B can defend. Although W lives, it is very small.

B still has T16 and P16 sente. W can't be satisfied.])
(;AE[jc]AW[kc]C[W also has an extreme way of playing. 

If the stone is closer with the prerequisite that B can't atari in a ladder.

...

Every one must watch out that if my ladder is working then I may stubbornly connect.

But for B, there isn't much to be afraid of.

...

So when W's stone is closer, B must be a little more careful. Of course, this leaves our topic a bit far. If W is further, B can just block and it is ok.]
(;B[mc]
;W[nd]C[You can't atari because W runs.]
;B[mb]C[Directly fighting can also be considered but it feels a bit unconvincing.]
;W[rd]
;B[re]
;W[rc]C[Because if you don't have the ladder, after W hane and connects, you have no way of capturing W's vital cutting stones, so it is difficult for B.

B's first consideration is how to play a ladder breaker.])
(;B[mb]C[You also can't pull back.]
;W[mc]C[This is different to before where B had M17.])
(;B[dp]C[Firstly, B can consider a ladder breaker technique.]
;W[nd]
;B[rd]C[B can get enough profit on the lower left before descending. Because there is N18 extension to make a capture race and O15 to short liberties, B has nothing to be afraid of.

Although W does have profit, but it depends on the severity of the ko threat. Normally one doesn't have to be too worried about atari and connect.]))))
(;W[rd]
;B[re]
;W[qe]C[W also has another way to play.]
(;B[od]C[B simply connects]
;W[rf]
;B[rc]
;W[se]
;B[rb]C[This can still gain the corner territory and the position of R13 remains at good, it can also be said to point at W's shape.])
(;B[pe]C[If B doesn't want to go into that variation, returning to the variation in one's mind, B can turn atari. W doesn't have any special move.]
;W[nc]
;B[od]
;W[mb]
;B[pb]
;W[na]
;B[qb]C[It basically reverts to before.])))
(;B[nc]C[Now B can't pull back.

...

In conclusion this move makes a loss.]
;AE[qg][qj]C[If R13 isn't there, a standard 3-3 invasion, of course this is no problem for B.]
;W[nb]
;B[mc]
;W[rd]
;B[re]
;W[rc]
;B[qf]C[This is standard. ]
;AE[qf]AW[qj]AB[qg]C[If we compare to the standard variation, this stone has moved. Firstly, the shape is already not right.]
;AE[rc]C[Secondly, after W hanes, W can tenuki]
;W[]
(;B[mb]
;W[rc]C[If you later turn, then I can connect.])
(;B[rc]C[If you capture, then ]
;W[rb]
;B[sd]C[W can tenuki again, N18 crawl and T18 descend, W can get at least one of them.]))))
(;W[mc]C[If W just simply extends two spaces, ]
(;B[oc]C[B will simply diagonal defence.])
(;B[pc]C[Of course, B can also nail in.]))
(;W[nc]
;B[pc]C[Of course, if you extend 3 spaces, B will simply descend. This isn't any good for B. After descending, there is the invasion.]))
(;B[oc]C[Of course, for B to play, it is very easy, just defend it.]))