(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 Kyu - Lesson 6]
PC[https://online-go.com/review/57653]
PB[Black]
PW[White]
BR[1d]
WR[1d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

(;AB[rc]
;AB[rd]
;AB[re]
;AB[qe]
;AB[pd]
;AB[od]
;AB[nc]
;AB[mb]
;AW[pc]
;AW[qc]
;AW[qd]
;AW[rb]
;AW[sc]
;AW[qa]C[Last time we investigated some attacking tesuji. Now let's move onto life and death problems.

This is today's first problem. It's black to kill white. Because of white's tiger's mouth, it looks like this group is alive.

LESSON 6 - EYE-STEALING TESUJI
It seems like white has two eyes. However, black can make the left eye into a false eye. Where is the tesuji?]
;B[ob]C[If black plays the diagonal,]
;W[pb]C[White will make an eye and live easily. It's a failure.]
;AE[pb]
;AE[ob]C[You need to think about the proverb, "the enemy's vital point is your own."]
;B[pb]C[In this case, this attachment is a sharp move.]
;W[ob]C[White can't survive without capturing this stone.]
;B[oc]C[But black will atari here.]
;W[qb]C[After this, how can black capture white?]
;B[oa]C[This atari is the tesuji.]
;W[pa]C[White has to capture this stone,]
;B[na]C[But white can't survive. This is a practical situation, so the combination is worth remembering.]
;AE[na]
;AE[pa]
;AE[oa]
;AE[oc]
;AE[ob]
;AE[qb]CR[qa]C[After this tiger's mouth, white seems to be alive.]
;AB[pb]C[But black can capture the group with this attachment. I hope you'll be able to use this tesuji in actual games.]
)(;AB[pc]
;AB[pd]
;AB[qd]
;AB[pe]
;AB[pf]
;AB[pg]
;AB[qh]
;AB[qi]
;AB[qj]
;AB[qk]
;AB[rk]
;AW[rj]
;AW[ri]
;AW[rh]
;AW[qg]
;AW[qf]
;AW[ob]
;AW[pb]
;AW[qc]
;AW[rc]
;AW[rd]C[This is today's second life and death puzzle. It's black to separate and kill white's five stones on the bottom.]
;B[re]C[Since black is trying to separate the two stones, the first move has to be this one.]
;W[qe]LB[rg:A]C[The obvious counter move fails because of black A. Black's move looks promising, but we must consider other possible counter-moves by white.]
;AE[qe]
;AW[rf]LB[qe:A]LB[se:B]C[The next most obvious counter-move is this one, which aims at going over the black stone at A or under it at B. Now it is time to find the tesuji.]
;B[sf]LB[qe:A]C[This is the tesuji. It's the same tesuji as in the first puzzle. If you learned it well you probably spotted it. This move stops white from linking up, and white can't cut at A because there's not enough liberties (white would be putting herself into atari).]
;W[sg]
;B[se]C[This is still true after white ataris and black connects. The white stones are cut off and are dead.]
;AE[se]
;AE[sg]
;AE[sf]
;AE[rf]C[So the second white move we have investigated turns out to be a failure. That only means that other, less obvious white moves have to be tested.]
;W[se]C[The next candidate might be the hane here.]
;B[rf]C[If black plays here, ]
;W[rg]LB[qe:A]LB[sf:B]C[White will connect here and threaten to link up with either A or B. Black cannot defend against both of these threats, so he has failed. In this kind of situation, A and B are called miai. If one player takes one of them, the other player can take the other.]
;AE[rg]
;AE[rf]C[Black's move has failed, but]
(;B[sf]C[This move succeeds.]
;W[qe]C[If white cuts here, do you know the tesuji for black?]
;B[rg]C[Black has the snap-back tesuji here. ]
;W[rf]C[If white captures the stone,]
;B[re]C[Black captures all of white's stones. Therefore, the hane is the right answer for black.]
)(;AE[se]C[White's resources are fast disappearing. We must now turn to less likely choices. ]
;AW[sf]LB[qe:B]LB[rg:A]C[The last arrow in white's quiver is the one-point jump to the edge. It guards the cutting point at A and threatens to cut at B.]
;B[qe]C[If black connects here,]
;W[se]C[White can link up.]
;AE[se]
;AE[qe]
;B[rf]C[This move runs into something we have seen before.]
;W[rg]LB[qe:A]LB[se:B]C[This is also a failure for black.]
;AE[rg]
;AE[rf]
;B[se]C[Boldness may succeed where caution fails, so next black tries blocking white's way directly. At first, this seems to work.]
;W[qe]C[White cannot cut here because]
;B[rg]C[Black will cut her right back.]
;AE[rg]
;AE[qe]
;W[rf]C[There is also this move.]
;B[qe]C[If black connects,]
;W[sg]C[White can live. Therefore, the conclusion black might come to is that this is the best sequence for both sides. Since he has put so much thought into reading it out from move 1, black may be tempted to play this variation out even though it is not a real success. However, black would be wrong to stop reading here because there is another move that does work. :-)]
;AE[sg]
;AE[qe]
;B[sg]LB[qe:A]C[If black looks again, he may finally see this tesuji, which destroys white's eye shape while inflicting shortage of liberties on her to keep her from cutting at A. Now he has the truth. He does not have to play this sequence at once, but he knows that when the time comes, the white stones are there for the taking.

This brings us to the end of today's lesson. During your games, fighting will often occur. Let me give you a tip related to that. Focus on making territory while fighting. Instead of attacking directly, make it your goal to profit somehow from the fight. That way you'll have more territory when the battle concludes! Thank you!]
)))