(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 kyu - Lesson 15]
PC[https://online-go.com/review/402823]
PB[Black]
PW[White]
BR[2d]
WR[2d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

;B[pd]
;W[dd]C[

-- chat --
mark5000: I would want to take the corner all the way back here.
mark5000: :)
Russjass: hah true
]
(;B[df]
;W[cf]
;B[de]
;W[ce]
;B[ed]
;W[dc]
;B[ec]
;W[cg]
;B[fe]
;W[qp]C[

-- chat --
mark5000: Or here, at least.
]
;B[op]
;W[pm]
;B[lq]
;W[pf]
;B[qf]
;W[qg]
;B[qe]
;W[pg]
;B[eb]
;W[lc]
;B[mc]
;W[ld]
;B[mb]
;W[ic]
;B[gc]
;W[lb]
;B[cb]
;W[bc]
;B[bb]
;W[db]
;B[da]
;W[cc]C[Hi! Here we'll learn about the importance of the corner and corner invasion. Let's look at this example. This game was played by two 10 kyu players. It was still early in the game. The lower left corner was empty. 

-- chat --
Аlрhа - 1 5 2: Hi, Mark!
mark5000: This is a text lecture. There is no audio or video, only text.
mark5000: Hi Alpha!
Lottee: Hi everyone!
mark5000: See you all next weekend. I'm sorry I don't have a schedule. It's whenever I find time on weekends. It's very spontaneous.
Russjass: Will keep my eye out, thanks
]
;B[ne]C[Instead of taking the corner, Black played here. To be honest, I think this sequence is strange. Neither player was interested in the lower left corner.]
;W[pq]C[At this point, White played here.

-- chat --
Godippi: hello all!
]
;B[oq]C[Black blocked, and]
;W[po]C[White defended with a diagonal.

-- chat --
ninetailedftw: could black play Q2?
]
;B[qj]C[Then Black invaded on the right side. What do you think of this sequence? Neither player took the empty corner. I suspect that they don't understand the importance of the corner. Sometimes, we see pros fight without taking the empty corners. But that only happens in urgent situations. I don't think this situation was that urgent. It's important to understand how big the corner is. The value of a corner is huge. Playing first in the corner can be worth 20 points. Unless you're fighting, you shouldn't leave the corner open like this.

-- chat --
Russjass: I would want to take the corner befor the N17 exchange tbh
mark5000: Just about every move was smaller than taking the empty corner.
Аlрhа - 1 5 2: I remember some joseki sequences that rely on a certain stone present on either side.
Аlрhа - 1 5 2: Maybe players wanted to place that stone first.
mark5000: That is a good guess. I don't know what the players were thinking. Whatever their thinking was, it was incorrect thinking. The corner was more important.
mark5000: The first part of today's lesson is to value the empty corner.
]
)(;B[pp]
;W[dq]C[Now we're going to look at invading the corner. The timing of a corner invasion is difficult for many players. ]
;B[do]
;W[dj]
;B[eq]
;W[er]
;B[ep]
;W[fq]
;B[fr]
;W[gr]
;B[dr]
;W[fs]
;B[cq]
;W[nc]
;B[pf]
;W[jd]C[If you leave the corner for too long, it'll turn into territory. So I'd like to give you some tips about corner invasions. Let's look at this example. The opening is ongoing. Black is developing a framework on the right side. In the upper left, White already has a large framework. It's Black's turn. Where should Black play now? Black would like to invade the upper left somehow.

-- chat --
Аlрhа - 1 5 2: L4?
Russjass: I would approach upper left, or 3-3
Russjass: I think b playing there own enclosure is going to get w to enclose to left
MoOoOoH: O3 ? 
MoOoOoH: enclose and preparing extension ? 
FabienChiron: C17 ? (and hello)
simpleTom: 3-3 at upper left or another way of invading, I think
TheDarkist: C9?
Russjass: But seems that B enclosure and frameworks is more invadeable than whites if white encloses now
Аlрhа - 1 5 2: If ivasion is a must I'd play f17.
Аlрhа - 1 5 2: *invasion
clackie: if you approach upper left, prepare to get kicked
MoOoOoH: i think there are still large point to plays and many invasion point in white framework
FabienChiron: ok, C14 then or F17
clackie: c14 and f17 you will get kicked and then have very little room to settle
TheDarkist: C14 is probs better than F17
Russjass: Yeah, approach will get kickedat c14, but w will have an isolated stone
mark5000: o3 and other moves on the lower side are possible. The most attractive options are in the upper left however.
Аlрhа - 1 5 2: W gets to much territory that way, too.
mark5000: Yep
mark5000: How should Black play then?
Аlрhа - 1 5 2: Looks like c17 then?
Russjass: Not let white get both K16 and D10
Russjass: lol
Russjass: Has to be 3-3 in this case
mark5000: lol
mark5000: k16 and d10 is not bad for Black. Just don't miss the next move. ;)
]
(;B[fc]C[How about approaching here?]
;W[ec]C[In response, White will kick like this.]
(;B[fd]C[Standing is the proper response to a kick. You need a special circumstance to not play it.

-- chat --
Russjass: Wasnt F15 played in some pro games
Russjass: Similar idea, but faster?
]
(;W[df]C[After this exchange, White will jump and attack the black group. Because White already has a pincer at the top, the black group will be harassed. It's bad to have a weak group at such an early stage in the ga Is isn't iIt's bad to have a weak group at such asn early stage in the game.

-- chat --
Аlрhа - 1 5 2: I think f16 is bad tho...
Аlрhа - 1 5 2: Not whith existing pincer, Clackie.
]
)(;W[cf]
;B[hc]C[

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badright: Hi there, is J17 too much distant for black?
clackie: I think standing up is worth it to not give white good shape and easy attack
]
))(;B[jc]C[

-- chat --
mark5000: Alpha suggested this.
Russjass: lol, play it in your games, that is the truest ruling
mark5000: What do you think?
simpleTom: 3. From move 0: Q16 D16 Q4 D3 D5 D10 E3 E2 E4 F3 F2 G2 D2 F1 C3 O17 Q14 K16 F17 E17 K17 
Russjass: It is more flexible, you are getting rid of one stone with alpha suggestion, but might get better shape
simpleTom: I think that's a bit of an overplay
]
(;W[ic]C[

-- chat --
mark5000: White would bend here and separate the stones.
Russjass: cut, for chaos
Аlрhа - 1 5 2: For Chaos indeed.
]
;B[id]C[

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mark5000: Does anyone know what the proper move in a cross cut is?
]
;W[hc]C[

-- chat --
mark5000: Correct.
mark5000: So this move comes to mind first.
Аlрhа - 1 5 2: l16?
]
(;B[kd]C[

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Russjass: H16 now
]
;W[je]
;B[le]
;W[kc]C[

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Аlрhа - 1 5 2: m17 now
mark5000: You'd let this stone be eaten?
Аlрhа - 1 5 2: Yea
]
;B[lc]C[

-- chat --
Russjass: I like H16 instead of atari
]
;W[jb]C[

-- chat --
clackie: so standing up after the kick is probably more better right?
mark5000: Yes.
clackie: boo yah
mark5000: This is kind of a disaster for Black. White occupies the middle of the upper side with a ponnuki. White's influence is huge and is broken up by two weak black stones that aren't cutting anything anymore.
mark5000: Meanwhile, White can easily invade the upper right corner.
]
)(;B[hd]C[

-- chat --
mark5000: THis resistance would be stronger, but it's still a bit worse than standing.
]
))(;W[fd]
;B[gc]
;W[ic]C[

-- chat --
badright: ok thanks
]
))(;B[fe]C[

-- chat --
mark5000: I'm sure pros have tried it before.
mark5000: Do you know the drawbacks?
Russjass: The wedge?
Bart-Jan: F16?
Bart-Jan: and a lot of cutting points
]
(;W[fd]
;B[gd]
;W[ed]
(;B[gc]
;W[ge]C[

-- chat --
Аlрhа - 1 5 2: 5. From move 0: Q16 D16 Q4 D3 D5 D10 E3 E2 E4 F3 F2 G2 D2 F1 C3 O17 Q14 K16 F17 E17 F15 F16 G16 E16 G17 G15 
]
)(;B[he]C[

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mark5000: Wedging is what Black wants.
]
(;W[dg]C[

-- chat --
mark5000: This is a more resilient shape than just standing.
Аlрhа - 1 5 2: This sequence is actually pretty cool.
Russjass: h17 though?
Russjass: for white
]
)(;W[hc]
;B[gc]
;W[dg]C[

-- chat --
clackie: white gets all the free pokes
mark5000: That's possible.
clackie: makes blacks shape all stupid
Аlрhа - 1 5 2: l17 for the kill
mark5000: You can't attack from a weak position.
mark5000: l17 would be overplay.
Russjass: Kill? it is barely a group and has a weaker group to chase
mark5000: It's important here to know the difference between invasion and reduction.
mark5000: This sequence started as an invasion but has evolved into a reduction.
]
(;B[jf]C[

-- chat --
clackie: black isn't reducing if black dies
mark5000: When reducing, play light moves on the outside.
mark5000: Capping looks good to me.
Russjass: Failure unles you can enclose to match territory
mark5000: This is my choice
clackie: its running towards something
mark5000: It pokes at m17 later.
mark5000: Or l17
Russjass: is j17 a thing for black at some point? emergency move?
mark5000: l17 is superior to j17, so no.
]
;W[nq]C[

-- chat --
clackie: o3 > q2
mark5000: We're getting too far into the weeds here. Let me go back some.
]
;B[kc]
;W[kd]
;B[jc]
;W[ic]
;B[id]C[

-- chat --
mark5000: This captures.
Russjass: yeah, i see
]
)(;B[ig]C[

-- chat --
mark5000: This knight is also possible
mark5000: White's framework in the upper left is broken a little bit.
Russjass: cap seems better
]
))))(;W[fb]C[

-- chat --
Аlрhа - 1 5 2: How can B attack to keep sente?
mark5000: Generally, hane refutes the jump.
]
;B[gc]
;W[df]C[

-- chat --
Russjass: yup, that hurts
mark5000: This is good enough for most situations.
mark5000: f18 makes a corner invasion really hard.
]
;B[cc]
;W[cd]
;B[eb]
;W[db]C[

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mark5000: This move is atari now.
]
;AE[gc]
;AE[fe]
;AB[fd]
;AE[fb]C[

-- chat --
mark5000: In the normal case, it's not atari
mark5000: So the jump isn't really popular.
]
)))(;B[cf]C[If Black approaches here, Black can expect a similarly bad result.]
;W[ce]
;B[df]
;W[fd]C[White has a pincer already in place, so the black group is unsettled and weak.]
)(;B[cc]C[This invasion at 3-3 is a well timed move.]
;W[dc]C[Since White has a better framework at the top, blocking here is a good direction of play.]
;B[cd]C[After that, Black pushes here to make more points in the corner.

-- chat --
mark5000: You can also play differently than hane here.
mark5000: That's all I have planned for today.
Russjass: Thank you
Аlрhа - 1 5 2: Wait a sec...
Russjass: Very informative
Аlрhа - 1 5 2: I have a crazy idea.
Wong Kar-Wai: Thank you.
Xaloc: Thank you!
opuss: Thanks.
Аlрhа - 1 5 2: What if, W b15?
Russjass: Are these regular? Or as and when?
opuss: or C14?
snakesss: thanks mark
mark5000: Yes, k16 is well placed in all these sequences.
Аlрhа - 1 5 2: Umm...
Russjass: Every saturday?
Аlрhа - 1 5 2: b15? Anyone?
Russjass: excellent
mark5000: b15 says you're going to kill. It's great when you do and awful if you don't.
bodlike: thanks!
Russjass: b15, c15 then?
Аlрhа - 1 5 2: b14
mark5000: c14 is the third choice and it's complicated. It's beyond the scope of this beginner lecture, helping you to break into the SDK ranks.
opuss: OK. Thanks.
Аlрhа - 1 5 2: Thanks, Mark.
]
(;W[ce]C[It's important to learn basic 3-3 josekis properly.]
;B[be]C[

-- chat --
mark5000: Sure, you can double hane here, as you said.
]
(;W[cf]C[After White extends,]
;B[bf]C[Black needs to push once more. That's because, otherwise, White can block here in sente.

-- chat --
Аlрhа - 1 5 2: What if W double hanes?
]
(;W[cg]C[After that exchange, pushing b13 isn't sente anymore.

-- chat --
Wong Kar-Wai: So basically, black wins regardless because white lost massive territory potential?
snakesss: if i got smt at g16 already for example
snakesss: then i dont need to play it, right?
Russjass: Can it be omited if K16 is closer?
Wong Kar-Wai: White is not behind for making good shape and getting massive influence in top.
Wong Kar-Wai: In my ignorant opinion.
Аlрhа - 1 5 2: So... Can W force different joseki after 3-3?
]
;B[db]C[So Black hanes here.

-- chat --
mark5000: Yes.
mark5000: The point of this joseki is Black gets territory and WHite gets influence. If you spoil the influence, it's just not joseki.
mark5000: Black gets territory for no compensation in exchange.
]
;W[eb]
;B[cb]C[White can't play away now.

-- chat --
Russjass: W plays B13 against me all the time instead of C13
Wong Kar-Wai: Okay.
]
(;W[nq]C[

-- chat --
mark5000: Same
]
(;B[fb]C[The attachment offers powerful aji for later.]
)(;B[fc]C[Black can also peep like this.

-- chat --
Wong Kar-Wai: Attachment is same as clamp-on?
]
)(;B[ec]C[Black can also cut.

-- chat --
Wong Kar-Wai: Okay.
]
))(;W[fc]C[To prevent that from happening, White should play the tiger's mouth. In exchange for the corner territory, Black gives White influence on the outside. But this area was already White's. With this invasion, Black gained about ten points in sente.

-- chat --
Russjass: Whay dont you like it?
snakesss: maybe smt that can have an impact on the center in certain situations
snakesss: cuz it feels passive lots of times 
mark5000: The tiger's mouth is the best shape for the local area. Sometimes other points are more urgent. In the general case, it's urgent enough to play immediately. It's more urgent than enclosing a corner.
snakesss: and also, feels like i am not assessing the situation correctly and playing it when i dont rly have to 
]
(;B[nq]C[After that, Black can take a big move like this one suggested earlier.]
)(;B[le]C[Black can also reduce White's potential with this cap or similar placements.

-- chat --
snakesss: i hate playing that f17 tiger's mouth
Wong Kar-Wai: Why?
snakesss: are there alternatives to it?
Wong Kar-Wai: It's good shape.
]
)))(;W[bg]C[

-- chat --
mark5000: This is common in beginner games.
mark5000: It's really bad.
mark5000: Black can simply cut.
Russjass: I know, but I can never make it work with the cut
]
;B[cg]C[

-- chat --
Xaloc: Yep, count the liberties! less than 5 for each group
]
;W[bh]
(;B[de]
;W[df]
;B[ee]C[

-- chat --
Russjass: Okay, so you have to cut before playing the D18 exchange?
Wong Kar-Wai: So white at this point has a decision between saving the 3 or 2?
mark5000: It's fine either way.
mark5000: Yes
Wong Kar-Wai: ty
snakesss: great q
]
)(;B[db]C[

-- chat --
mark5000: This is the other way.
]
;W[eb]
;B[cb]C[

-- chat --
Wong Kar-Wai: Show the snapback again.
]
;W[fc]C[

-- chat --
mark5000: But liberties hurt
mark5000: Does anyone see a snapback?
Russjass: yup
Wong Kar-Wai: D14?
mark5000: It's cut, actually.
]
;B[de]
;W[df]
;B[ee]
(;W[dg]
;B[fd]C[

-- chat --
Russjass: Here?. From move 0: Q16 D16 Q4 D3 D5 D10 E3 E2 E4 F3 F2 G2 D2 F1 C3 O17 Q14 K16 C17 D17 C16 C15 B15 C14 B14 B13 C13 B12 D18 E18 C18 F17 D15 D14 E15 D13 F16 
]
)(;W[ef]
;B[fd]C[

-- chat --
Wong Kar-Wai: Oh wow.
Wong Kar-Wai: That's so cool.
Bart-Jan: E17?
]
(;W[ed]
;B[ec]
)(;W[fe]
;B[ed]
;W[ec]
;B[gd]C[

-- chat --
mark5000: White is screwed.
Wong Kar-Wai: Insert Owen Wilson: wow.
Russjass: Okay, will need to remember this
]
)(;W[ec]C[

-- chat --
Аlрhа - 1 5 2: f14
]
;B[ff]C[

-- chat --
mark5000: yes
mark5000: It's just reading from here.
mark5000: Black is already good. Just jump and reduce after you're done harassing W.
]
)))))(;W[bf]C[

-- chat --
mark5000: Double hane is good. It's the other joseki.
]
;B[cf]
;W[de]
;B[bg]C[

-- chat --
mark5000: Black will get strong outside.
]
;W[bd]
;B[af]
;W[bc]C[

-- chat --
Russjass: I prefer black in double hane variation
mark5000: And White retakes the corner in gote.
Аlрhа - 1 5 2: Does d10 play any role here tho?
Russjass: It is a target for black :P
mark5000: Certainly
]
;B[df]TR[dj]C[

-- chat --
mark5000: Black would push here, leaning on the upper group for strength.
mark5000: Preparing to target d10
Russjass: White can double hane here too?
mark5000: It's very important to get strong before attacking. Attacking when off balance is bad in martial arts and in Go.
]
;W[cm]C[

-- chat --
Аlрhа - 1 5 2: Is there a drunken master Go style? =)
mark5000: I think White would just settle here.
mark5000: It's another game.
mark5000: Let's look at the first joseki.
]
))(;W[de]C[

-- chat --
mark5000: For example, stretch.
Russjass: Seems passive though? What are the advantages?
mark5000: Sente.
Russjass: ahhh
]
;B[ce]
;W[df]
;B[bg]
;W[nq]C[

-- chat --
mark5000: Sente is why you'd play this.
Russjass: okay, i like that
mark5000: On the other hand, BLack got many more points in the corner than BLack deserves.
]
)(;W[pq]C[

-- chat --
simpleTom: K16 would be at a very good spot though with the stretching joseki, right?
simpleTom: Thank you for preparing these classes, Mark :)
]
)(;W[cf]
;B[ce]C[

-- chat --
snakesss: these are almost regular russ
]
;W[de]
;B[bf]
;W[cb]C[

-- chat --
snakesss: https://forums.online-go.com/t/becoming-9-kyu-a-series-for-beginners/3809
]
)(;W[bf]
;B[ce]
;W[cg]
;B[de]
;W[fd]C[

-- chat --
mark5000: Probably continue like this Alpha
mark5000: The same principles apply. Invade and reduce/escape.
Russjass: I like this for black, a few points and no influence for white
mark5000: Me too. It's only joseki with equal compensation. Remember this.
]
))))