(;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?

-- chat --
Enumaris: Hello Everybody
tinuviel: hi, there :)
Enumaris: first time participating in one of these :D
severence: d1. From move 0: S17 S16 S15 R15 Q16 P16 O17 N18 Q17 R17 R16 S18 T17 R19 
severence: d2. From move 0: S17 S16 S15 R15 Q16 P16 O17 N18 Q17 R17 R16 S18 T17 R19 
severence: d3. From move 0: S17 S16 S15 R15 Q16 P16 O17 N18 Q17 R17 R16 S18 T17 R19 
severence: d4. From move 0: S17 S16 S15 R15 Q16 P16 O17 N18 Q17 R17 R16 S18 T17 R19 
severence: sorry, misclicking
Enumaris: are the variations your solutions?
mark5000: You can easily see how important reading is to Go strength. Therefore, don't be lazy. :-)
Enumaris: indeed
tinuviel: but, i wanna...
mark5000: When you know tesujis, reading becomes easy and fast.
mark5000: Solve puzzles to improve your Go strength
mark5000: Any questions?
tinuviel: thanks again; as always, very clear :)
calantir: is it wrong that i'm here to get tips on beating you in our game?
mark5000: Nope!
calantir: /me wants to get back in the ladder top 10
calantir: /me's chances are small
mark5000: hahaha, not really. You're doing really well in our game
tinuviel: calantir, the gist is to do tsumego
tinuviel: would have helped you in your game this afternoon
calantir: oh the pain
calantir: shut up
mark5000: And the eye-stealing tesuji is really useful. :-)
tinuviel: :-o
mark5000: Thanks everyone! Bye.
calantir: bye!
tinuviel: bye :)
mark5000: Next lesson is planned for Saturday. (evening for Europe, afternoon for Americas)
Seferi: d1. From move 0: S17 S16 S15 R15 Q16 P16 O17 N18 Q17 R17 R16 S18 T17 R19 
]
;B[ob]C[If black plays the diagonal,]
;W[pb]C[White will make an eye and live easily. It's a failure.

-- chat --
severence: (mine, no)
Enumaris: ah
]
;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?

-- chat --
Enumaris: dang, I missed this shortage of liberty in my reading! :(
]
;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.

-- chat --
Enumaris: all of white?
Enumaris: oh
]
;B[re]C[Since black is trying to separate the two stones, the first move has to be this one.]
(;W[rg]
;B[qe]C[

-- chat --
tinuviel: s15
]
)(;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.

-- chat --
Enumaris: t14 in this case? 
tinuviel: t14
]
;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.

-- chat --
mark5000: See how useful the false-eye tesuji is!
Enumaris: indeed
]
;AE[se]C[

-- chat --
tinuviel: ha
]
;AE[sg]C[

-- chat --
tinuviel: i'm trying to make a group live in a current game
tinuviel: and this keeps getting in the way
]
;AE[sf]C[

-- chat --
Enumaris: I never use any tesuji in my games...I can only see them when I know they are there lol
]
;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.

-- chat --
mark5000: lol
]
;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

-- chat --
tinuviel: playee?
tinuviel: haha
Enumaris: hane at t14!
]
(;B[sf]C[This move succeeds.]
;W[qe]C[If white cuts here, do you know the tesuji for black?

-- chat --
Enumaris: snap back at S13?
]
;B[rg]C[Black has the snap-back tesuji here. 

-- chat --
Enumaris: if only I could actually see any of this in my own games
]
;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.

-- chat --
Enumaris: t15!
]
;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.

-- chat --
tinuviel: b s13
]
;AE[rg]C[

-- chat --
tinuviel: crazy
]
;AE[qe]
;W[rf]C[There is also this move.

-- chat --
tinuviel: b s13 again
]
;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. :-)

-- chat --
tinuviel: mmm, or not
Enumaris: doesn't black 17 at t13 work?
]
;AE[sg]
;AE[qe]C[

-- chat --
tinuviel: wait, i stand by s13 after all
]
;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!

-- chat --
tinuviel: oh i meant t
tinuviel: *facepalm*
Enumaris: XD
mark5000: hahaha, oh man, I forgot that this was at the end
mark5000: Yeah, okay,
tinuviel: it's okay mark, i can't read letters
tinuviel: so you're a step ahead
tinuviel: thank you
Enumaris: I can neve figure out how to make territory while fighting...cus my fighting always happens towards the center :(
mark5000: I hope you can use the false-eye tesuji in your games.
Enumaris: Thanks for the lesson :D
mark5000: it's also called the "eye-stealing" tesuji
nelg: 5. From move 0: Q17 Q16 R16 Q15 Q14 Q13 R12 R11 R10 R9 S9 S10 S11 S12 R13 R14 P18 Q18 R17 S17 S16 S15 R15 R15 S14 T14 T13 T15 T15 T13 T14 S14 T15 S14 S13 S13 S14 T15 T14 R15 T15 T15 R15 S14 S13 S13 S14 T15 R15 S13 S13 R15 S14 R15 T13 T13 R15 T13 
nelg: Sorry, mis-clicked the "Share" button while scrolling through the text.
]
))))