(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 Kyu - Lesson 49]
PC[https://online-go.com/review/454793]
PB[Black]
PW[White]
BR[2d]
WR[2d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

;AB[pd]
;B[pj]C[Hi! Let's look at practical life and death puzzles.



-- chat --
jillgoodgal: yay I was hoping there would be a lesson today!
S_Alexander: Pro game in 4 minutes :/
mark5000: Oh there is?
mark5000: Maybe I should postpone...
Jhyn: Which pro game @S_Alexander?
tpnZbonek: hey mark
S_Alexander: https://online-go.com/game/22668514
tpnZbonek: its corona cup tournament?
mark5000: Let's watch the pro game. I'll do this later today.
Jhyn: Oh Welvang is playing, didn't know that
mark5000: All right. Hope to see most of you later today. Maybe in a few hours.
Jhyn: Thanks @S_Alexander
GOkyle: So you know, they're playing two games in quick succession, not just one.
S_Alexander: They're gonna play two games so might take some time :P
mark5000: Thanks .I'll put up a banner when I do it later.
tpnZbonek: but 10 minutes lenght..
Kawabata: Yas see you later
Kawabata: Hello
jillgoodgal: for real now?
Kawabata: I think so
HowToPlay?: Mark wouldnt betray us twice in one day
jillgoodgal: but you are already 9 kyu
Kawabata: How many time a week does Mark teach like this?
jillgoodgal: haha
jillgoodgal: most Saturdays
Kawabata: Ok thanks
jillgoodgal: usually 8am Pacific time so it is the only reason I get out of bed on Saturday morning!
Kawabata: Ahah
]
;W[nc]C[White approaches the corner.

-- chat --
Kawabata: I'm in Intaly, so I'm usually in aperitivo time
]
;B[pf]
;W[qc]C[Then sometimes White invades at 3-3 immediately. There's a good life and death puzzle arising from one possible variation.

-- chat --
jillgoodgal: good move!
]
;B[pc]C[In response, Black needs to separate white.]
;W[pb]
;B[ob]
;W[qb]
;B[oc]C[Up to here, it's a one-way street.

-- chat --
Kawabata: We can post variations to answer?
]
;W[re]C[And White plays a knight's move.

-- chat --
mark5000: Yep
Kawabata: Ok, ty
]
;B[rf]C[Then Black has to pressure White as much as possible, like this.]
;W[qe]C[White stretches.]
;B[qf]C[And Black connects here.]
;W[pe]C[Before living in the corner, White should create some weaknesses, like this.]
;B[oe]
;W[qd]C[Up to here, it's joseki.]
;AE[qd]C[But what if White plays elsewhere now? Many of you must be curious about the life and death in the corner. In this case, Black can capture white unconditionally. How should Black attack the corner?

-- chat --
jift: s16 ?
jift: maybe starting off with a hane
]
(;B[rd]C[Some of you would think about this attachment.

-- chat --
Johnqpublic: s 17
]
;W[qd]
;B[se]
;W[rc]C[But after connecting, White will atari.]
;B[sd]
;W[ra]C[Then this tiger's mouth is a great move. So white's alive.]
;B[sb]C[If Black keeps attacking,]
;W[sc]C[White can atari and make one eye. So the corner is safe now. It's a failure for Black. The attachment doesn't work.]
)(;B[ra]
;W[sb]
;B[rd]
;W[qd]
;B[se]
;W[rc]
;B[sd]
;W[sc]
;B[sf]C[

-- chat --
samaris: s19?
]
)(;B[sc]C[This placement looks plausible. If White makes a mistake, the corner will be captured.]
(;W[qd]C[In this case, connecting here is a good response.]
;B[se]C[After Black bends,]
;W[sd]C[This throw in is a good tactic.]
;B[rd]C[Black has to capture this stone.]
;W[rc]C[Then White ataris.]
(;B[sd]C[If Black connects,]
;W[sb]C[White will live in the corner.]
)(;B[sb]C[So Black has to stretch here.]
;W[sd]C[Now it's a ko.]
;B[sf]C[If Black connects,]
;W[rb]C[White starts the ko with an atari here. Since Black can capture white unconditionally, this is a failure too.]
))(;AE[sc]C[When you attack the corner, you should first think about reducing your opponent's eye space.

-- chat --
Cheese and Clackers: I just did one of these more or less in a game
]
;AB[se]C[So this bend is the answer now.]
;W[rd]C[White has no choice but to rescue the three white stones.]
;B[pa]C[Then Black reduces white's eye space again with another bend. Now White's corner dies.

-- chat --
jillgoodgal: I recently had an opponent try to kill my corner in this situation in a tournament game but survived
]
(;W[sb]C[If White jumps,

-- chat --
Cheese and Clackers: yes in my game black pussed at t16 instead of the other hane
]
;B[ra]C[This placement is vital.

-- chat --
Txipa: Thanks for your time Mark
Txipa: Cheers
]
)(;W[rb]C[If White plays here,]
;B[sc]C[Black can capture the corner with this placement as well. Remember the proverb, "There is death in the hane."

-- chat --
jillgoodgal: so kill the hane!
mark5000: Yes!
mark5000: This principle applies to many life and death situations.
jift: everywhere i go
jift: i see hane
mark5000: Whenever you solve a puzzle, whether contrived or in your own games, think of reducing eye space first.
mark5000: That's all I wanted to show you today. I'll keep this one brief. Are there any questions?
mark5000: Find past lessons at https://forums.online-go.com/t/becoming-9-kyu-a-series-for-beginners/3809
Cheese and Clackers: oh did you start this hours ago and then restart it?
Kawabata: ty
mark5000: I did. I didn't want to draw viewers away from the EGF tournament.
jillgoodgal: yes we watched the pro game during the interim
jillgoodgal: black almost did this to white in the top left
mark5000: You're welcome. Next lesson next Saturday will be about 3-3 point joseki and will be a longer lesson.
Tavukmarti: Thanks 
jillgoodgal: oh good I have an opponent who tried a 3-3/5-5 enclosure
jift: Thank you :)
jillgoodgal: so timely
mark5000: Great. See you all then :)
]
)))(;B[se]
;W[ra]
;B[sc]
;W[sb]
;B[pa]
;W[rc]
;B[sd]C[

-- chat --
Kawabata: T15 seems to be killer
]
))