(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 Kyu - Lesson 23]
PC[https://online-go.com/review/410945]
PB[Black]
PW[White]
BR[2d]
WR[2d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

;B[pd]
(;B[pp]
(;W[nq]
;B[pn]
;W[ql]C[Hi! Let’s look at some important concepts in the corner. White just approached here. ]
;B[qm]C[Some players kick here to secure the corner.]
;W[pl]C[In response, White will stand up here.]
;B[oq]C[Some players kick again, making White stand up here, too!]
;W[np]
;B[nr]C[I saw a player play like this once.]
;W[mr]
;B[or]LB[lq:A]C[As White, is a defense at A necessary?]
(;W[qo]C[If White can, White would like to peep here and ruin Black's intention of taking a big corner territory.]
(;B[mq]C[If Black cuts, and the ladder works for Black,]
;W[lq]C[White would follow once.]
;B[mp]C[Black stretches, and]
;W[lo]C[White would net here. Black captures two stones but concedes some influence to White. So the ladder isn’t dangerous for White.]
)(;B[po]C[A Go proverb says, "Always connect against a peep."]
;W[rm]C[And then White should bend and link under like this. A theme of this lesson will be when to defend and when to counter attack. The rule is this: look for counter attacks first; defend only if no counter attack works.]
))(;W[lq]C[Suppose that White defends the corner. This is still a big move, even though it misses a chance to counter attack.]
;B[rl]C[Black is a double digit kyu player who loves territory very much, so Black plays here again.]
;W[rk]
;B[rm]TR[qj]C[Black is determined to secure the corner. As White, is a defense at R10 necessary, or is there some chance to do more?]
(;W[qf]LB[nc:A]LB[qj:B]C[White would like to play here. If Black answers around A, then defending at B would make some nice territory for White.]
(;B[qk]C[One of the three weaknesses inherent in this shape is this cut. If the ladder works, you don't need to worry about this cut. If the ladder doesn't work, you can atari and net, as shown previously.]
;W[qj]
;B[pk]
;W[oj]C[In this way, White still makes something of the right side area.]
;B[rj]C[If Black ataris,]
;W[ok]C[White can change direction, and]
;B[sk]
(;W[nc]C[White can double approach the corner.]
)(;W[qc]C[White can also invade the corner. So Black shouldn't play like this.]
))(;B[rj]C[A second weakness of this shape is this clamp.]
;W[qj]C[In response, you can still play the hanging connection and cover the stone.]
;B[sk]C[Black will connect under.]
(;W[ri]C[Then, locally, this is the key move for White. Often White will take sente for another point on the board. But if a local answer is best, this move is usually right.]
;B[qk]LB[pj:A]LB[pk:B]C[White can choose A or B.]
;W[pk]C[If White is unafraid of ko, this sequence is a good resistance.]
)(;W[qi]C[This move is a bit slack.]
;B[qk]
;W[pk]C[Black reduced in sente. And White has an open skirt.]
))(;B[qj]C[This peep is the third weakness of White's shape. In response, you often don't need to answer it at all, especially if the game is still in an opening stage, like this.]
(;W[nc]C[White can simply take a big move. Black won't hurry to cut White off on the third line and grant a second big opening move to White.]
)(;W[qk]C[Connecting against the peep can’t be bad, per the proverb.Even a moron connects against a peep.”]
;B[rj]LB[pj:B]LB[sk:A]C[If Black descends, White can resist with A in some cases. But then Black shouldn’t have peeped at the connection in the first place.]
;W[pj]C[So usually White must play here.]
;B[sk]
;W[qi]LB[ph:B]LB[pi:A]C[Then bending here is a good idea. A and B are also worth considering instead of hane.]
)))(;W[qj]C[If White just plays here,]
;B[qg]C[Black can enclose the corner and spoil any chance for making something on this side area. In this case, there was an important point that was worth postponing the defensive move so you can take the initiative. Keep this in mind in your games before you defend in gote.]
)))(;AB[pj]
;W[nq]C[Here’s one example where kicking can be good.]
;B[pn]
(;W[ql]C[This position can arise in sanrensei. Some White players invade here. Has anyone seen this before? Sanrensei is less popular these days, but it's still attractive to many players because of the star points. The question is how to deal with this invasion as Black?]
(;B[qm]C[In this case, some players kick here.]
;W[pl]TR[pn]TR[pp]C[In my opinion, players who kick here don't understand the meaning of the 4-4 point and the one-space jump. As I've discussed before, the one-space jump enclosure from the 4-4 point isn't intended to take territory. That's what the third line enclosure is for. Instead, the fourth-line enclosure focuses on the potential on the side and in the center. Therefore, your response should be consistent with your intentions. Black should not protect the corner eaning of the 4-4 point and the one-space jump. As I've discussed before, the one-space jump from the 4-4 point isn't intended to take territory. That's what the third line enclosure is for. Instead, the fourth-line enclosure focuses on the potential on the side and in the center. Therefore, your response should be consistent with your intentions. Black should not prtotect the corner here.]
)(;B[pl]C[In this case, this attachment is very good.]
(;W[qk]C[White has to come out here.]
;B[pk]TR[pn]C[Then Black connects here making a solid wall on the outside. White can survive on the right side. But, in exchange, Black gained good influence. Remember that this enclosure isn't intended   isn't intended to take territory away.]
)(;W[pk]C[Say White wedges here.]
;B[ok]C[Black would atari on this side to avoid complications.]
;W[qk]
;B[qj]TR[pd]C[Then Black has a chance to block here. It works well with the 4-4 stone and the sanrensei.]
)(;W[pm]C[This wedge is similar.]
;B[om]C[Black also covers from above.]
;W[qm]
;B[ol]C[Then Black can just block here. It's also consistent with Black's intention to make influence and use the high enclosure for fighting.]
)))(;W[dp]C[Since I've shown some negative examples of kicking, I want to show one example where kicking can be good.]
(;B[oq]C[In this case, this kick is a good way to attack White.]
;W[np]C[After White stands up (making an iron pillar),]
;B[jp]C[Black can pincer and attack White severely. What do you think is the meaning of the kick in this case?]
(;W[nm]LB[km:C]LB[lp:B]LB[fq:A]C[And, yes, White will want to jump out here to rescue the group. Are you a territorial player or want to secure your stones before attacking? Play around A. Do you want to pull the rug out from under your opponent and deny them a base? Play at B. Do you love attacking and want every chance to push your opponent and bully them around the board? Play around C. Other moves are possible. Since there are so many places to play, it's hard to find the best ideas. It's more important to have a consistent plan and to execute that plan.ecure your stones before attacking? Play around A. Do you want to pull the rug out from under your opponent and dentyy them a base? Play at B. Do you love attacking and want toevery chance to push your opponent and bully them around the board? Play around C. Other moves are possible. Since there are so many places to play, it's hard to find the best ideas. It's more impotrtant to have a consistent plan and to execute that plan.]
)(;W[lq]C[White won't make a base here.]
;B[kq]C[Black would kick here, too, to deny White a base and make the group even heavier. Here's a good example of when White wouldn't want to stand up in response to the kick. It just looks too bad, since the stones are all very close together.]
))(;B[jp]C[If Black just pincers immediately,]
;W[pr]C[White will slide into the corner.]
;B[qq]C[Black should defend the corner.]
;W[lq]C[But after that White can get a base like this. Since White already played elsewhere once (D4), it's an unsatisfactory result for Black.]
))))(;W[dp]
(;B[pp]
;W[fd]
;B[pj]
;W[nq]
;B[pn]
;W[jp]
;B[cd]
;W[cc]
;B[dc]
;W[dd]
;B[db]
;W[de]
;B[bc]
;W[ce]
;B[bd]
;W[dj]
;B[cq]
;W[dq]
;B[cp]
;W[co]
;B[bo]
;W[cn]
;B[bn]
;W[cm]
;B[dr]
;W[er]
;B[cr]C[This board position comes from a game between two professional players. It's still early in the game. In the lower left, Black invaded at 3-3 and a joseki is underway.]
(;W[fq]C[White can complete the joseki with this tiger's mouth. ]
)(;W[no]C[But what if White plays elsewhere? How about this one-space jump? Locally speaking, it's a good move. If Black jumps to around here, it would make a big difference for the moyo. Therefore, it's a pivot point. There's a lot of aji in the corner, however.]
(;B[eq]C[In this case, the cutting weakness is too big to ignore.]
(;W[fq]C[What's the different between this time and the last situation?]
;B[ep]C[This push is also atari. Therefore, even if the ladder didn't matter in the first variations I showed, this position is much more dire.]
;W[do]
;B[fr]C[If the game goes like this, White's territorial framework on the lower side collapses. The moyo White wanted with O5 suddenly isn't making any territory, since Black is inside safely.]
)(;W[fr]C[Stretching here is a little better, but White still has unbearable weaknesses.]
;B[fp]LB[do:A]C[Making a diagonal here threatens capture at A.]
;W[eo]C[White has to defend it, and]
;B[gq]C[Another diagonal is severe.]
;W[gr]
;B[hq]
;W[hr]
;B[iq]
;W[ir]
;B[jq]
;W[jr]
;B[kq]C[White can't go on crawling like this!]
))(;AE[no]
;AW[fq]LB[no:A]C[Although there are other big points now, White needs to defend this weakness first. After that, White can aim at A. Don't forget to look at counter attacks, but sometimes they don't work and you have to defend your weaknesses!]
))(;AW[gp]C[In some cases, there can be a white stone here.]
(;W[fq]C[Do you think White still needs to defend in this case? No, White doesn't. Defending will make White's framework over-concentrated. It's too many stones doing the same job.]
)(;W[no]C[In this case, White can play here and take the big point.]
;B[eq]C[Now Black has a harder time cutting because of the G4 stone.]
;W[fr]
;B[ep]
;W[do]C[The difference between this position and the last position is so big. Before, Black got to push White along on the second line. Here, White got to link up and it is Black who's got a silly heavy group to rescue. The key point of this lessons is that the value of a move can vary depending on the surroundings. Remember this!]
)))(;B[pq]
(;W[dd]
;B[ql]
;W[qo]
;B[qp]
(;W[po]C[In this case, standing is what Black wants.]
;B[np]LB[ql:A]C[White will get bullied because the pincer stone at A was already in place.]
)(;W[op]C[Instead, White should make a knight's jump here.]
(;B[po]C[If Black cuts,]
;W[pp]
(;B[qq]
;W[pn]C[This ladder works for White in Chinese openings.n Cheninese openins.]
)(;B[qn]C[If Black instead plays here,]
;W[qq]
;B[ro]
;W[rp]
;B[qo]
;W[pr]LB[ql:A]C[White steals the corner. This is awful, given that Black outnumbered White 3:1 to start with. And A is too close.]
))(;B[pp]
;W[po]
;B[oo]
;W[oq]
)))(;W[qo]
;B[pk]
;W[qm]
;B[qp]
(;W[po]
;B[np]
)(;W[op]
;B[oq]
;W[rp]
;B[rq]
;W[pp]
;B[qq]
;W[np]
;B[mq]
)))))