(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 Kyu - Lesson 5]
PC[https://online-go.com/review/57081]
PB[Black]
PW[White]
BR[1d]
WR[1d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

(;AB[pa]
;AB[pb]
;AB[pc]
;AB[qd]
;AB[rd]
;AB[sd]
;AB[ah]
;AB[bh]
;AB[ch]
;AB[di]
;AB[dj]
;AB[dk]
;AB[cl]
;AB[bl]
;AB[al]
;AB[ki]
;AB[li]
;AB[mi]
;AB[nj]
;AB[nk]
;AB[nl]
;AB[mm]
;AB[lm]
;AB[km]
;AB[jl]
;AB[jk]
;AB[jj]C[This lesson focuses on the basic principles of the opening and why we play in the corners, sides, and center (in that order).

I think everyone already knows this, but we'll cover it once more to fully understand the fundamentals.

Let's have a look at this. Each group surrounds 9 points in the corner, on the side, and in the center. Black needs 6 moves in the corner to get 9 points. He needs 9 stones on the side, and 12 stones in the center. Therefore, the corner is the most efficient place to make territory. It's followed by the side, and finally the center. Since there are 2 edges in the corner, Black needs fewer stones. That's why Black can easily make points with just a few moves. The side has 1 edge, while the center is wide open. Clearly the corner is the easiest place to surround territory. In contrast, it's hardest to do so in the center. I suppose you'll know these facts well. However, this rule also applies to the strength and weakness of groups.]
)(;AB[qd]
;AB[oc]
;AB[kq]
;AB[hq]
;AB[ij]
;AB[kj]TR[pa]TR[qa]TR[ra]TR[sa]TR[pb]TR[qb]TR[rb]TR[sb]TR[rc]TR[sc]TR[ir]TR[jr]TR[is]TR[js]C[We're going to investigate how secure each part of the board is. I put 2 stones in the corner, on the side, and in the center of the board. Black made 10 points in the corner, 4 on the side, and 0 in the center.

This difference has a lot to do with safety. The 2 stones in the corner are absolutely safe. Those on the side are more or less secure. But what about the center? I don't think these stones are secure yet.

Besides territory, security should also be taken into account when choosing were to play. If the edge of the board is considered to be land, we might think of the center as sky. We first need to be firmly rooted in the ground, then we can face the sky. So we take the corners first, then the sides, and finally the center.

Let's move on to our tesuji lesson!]
)(;B[pd]
;W[dp]
;B[pp]
;W[dd]
(;B[jc]
;W[qf]
;B[pi]
;W[of]
;B[nd]
;W[rd]
;B[qc]
;W[nq]C[We're going to look at attacking tesujis today. Attacking is a fundamental Go skill. You'll feel a lot of pleasure when attacking. :) But first of all, you need to know how to do it well. It's important to find your opponent's weaknesses.

A 4-4 point joseki is in progress.]
;AE[nq]
;AW[ri]C[White needs to slide here to ensure life.]
;AE[ri]
;AW[nq]C[But White tenukied and approached the bottom right corner. How would you answer now?

1. Find the opponent's weaknesses.]
;B[qn]C[Some of you might play this knight's move because white just approached. But this move misses a great opportunity.]
;W[ri]C[If White slides here the chance is lost. Since White tenukied in the middle of the joseki, Black needs to punish White.]
;AE[ri]
;AE[qn]C[What kind of tesuji can Black use?]
;B[pg]C[In this case, this peep is the answer.]
;W[pf]C[White has no choice but to connect here. Let me give you some tips about peeps. In this case, you can't expect a lot from peeping on the other side. So this peep can never be bad.]
;B[qg]C[After this exchange, blocking here is severe.]
;W[qn]C[If White tenukies again,]
;B[rf]C[This hane hits the vital point.]
;W[re]
;B[rg]C[Now this cutting point is exposed. White's in huge trouble. Therefore, White needs to respond somehow.]
;AE[rg]
;AE[re]
;AE[rf]
;AE[qn]
;W[rg]C[White needs to bend and settle down like this.]
;B[rh]
;W[rf]
;B[pn]C[After that, Black should tenuki and take another big point in the bottom right.]
;AE[pn]
;AB[ng]C[Some people might be tempted to go on attacking. But this isn't a good idea.]
;W[rc]
;B[rb]
;W[qd]C[White will push and push again here.]
;B[pc]
;W[se]C[Now here's a tesuji, and this group is alive. The result is unsatisfactory for Black.]
;AE[se]
;AE[pc]
;AE[qd]
;AE[rb]
;AE[rc]
;AE[ng]
;B[rc]
;W[qn]C[White will likely tenuki and counter attack.]
;AE[qn]
;AE[rc]
;B[pn]C[Through these exchanges, Black's already gained a lot of profit. So it's time to defend here now. Don't forget to look for your opponent's weaknesses when attacking.

Now let's learn another tip for attacking!]
)(;B[qj]
;W[kc]
;B[mc]
;W[qf]
;B[me]
;W[cj]
;B[ke]
;W[id]
;B[od]
;W[ph]TR[qf]TR[ph]C[Have a look at this position. Black wants to attack the white group. What's the best way to attack?

The second theory of attacking is to drive the opponent's group into your thickness.

Black's top area is very solid.]
;B[oj]C[If you can come up with this jump, you have a good sense of direction.]
;W[nh]C[However, White can easily escape like this. I don't think it's the best way to attack.]
;AE[nh]
;AE[oj]
;B[nh]C[Let's try this point instead. This kind of capping play is often powerful when attacking. But it's the wrong direction of play in this case.]
;W[pj]C[White will attach here,]
;B[pk]C[Then Black has to bend.]
;W[oj]
;B[qi]C[This is the vital point.]
;W[oh]C[But White will connect with a bamboo joint. What do you think of this progression? White's group is running away from Black's thickness. It's a failure for Black.]
;AE[oh]
;AE[qi]
;AE[oj]
;AE[pk]
;AE[pj]
;AE[nh]C[How should Black attack the white group then?]
;B[oi]C[In this case, this knight's move is the answer. As the proverb says, "use a knight's move to attack."]
;W[ng]C[If White tries to escape,]
;B[mh]C[Play another knight's move. Black is driving White's group into Black's influence.]
;AE[mh]
;AE[ng]
(;W[oh]C[How about this push?]
;B[ni]C[Extending here is good enough for Black now.]
;W[nh]
;B[mi]
;W[mh]C[White still has to push again.]
;B[lh]C[After that, bending here is powerful.]
;W[lg]
;B[kg]C[White can't escape any further. Black successfully shuts white in. It looks like White can survive on the inside. But she'll have to make many bad exchanges in the process. And Black will easily build a huge framework at the lower side. This demonstrates the second principle of attacking.]
)(;W[rd]C[This one is possible.]
;B[rc]C[Black can attach here and keep a lot of the corner. As I said in the lecture, White has to make a lot of bad exchanges to live with her group.]
)(;W[qc]C[If White hits 3-3 now,]
;B[qd]C[Black can launch a splitting attack. I'm sure you all know it.]
;W[rd]C[White can try to link up, but]
;B[re]C[Black will block, and]
;W[rc]
;B[qe]
;W[ob]
;B[nb]
;W[oc]C[White lives, but the 2 stones on the right are pretty dead right now. Moreover, Black can choose where to play next. It's a failure for White.]
(;B[pb]C[If Black still plays in this area,]
;W[pc]
;B[oa]
;W[qb]
;B[pa]
;W[qa]
;B[na]
(;W[sb]C[White is still okay. Black should take sente instead and save this aji for ko threats.]
)(;W[nc]C[White also has this cool move. White knows the first principle of attacking: "look for your opponent's weaknesses."]
;B[lb]
;W[nd]
;B[ne]
;W[md]
;B[ld]
;W[lc]C[If black defends naturally, the group still gets cut off. It's a veritable disaster for black. It's another reason why it's best for black to play in another part of the board earlier.]
))(;B[cc]C[This move is big, and it's another game.]
)(;B[fq]C[Another game.]
)))))