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In your last diagram, what if White plays O2 instead of N1?
Yes I misread. Seems to be a big ko.
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Even no ko. Black descend, white too and black connect.
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If White 7 is right of Black 6 and Black descends, White descends, then Black connecting would be self atari ? Or did I misunderstand something?
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No,i was on inversing 6 and 7 as you suggested in the dia before (6 and 5 here)
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OK I realized my variation was wrong (White just dies), and was saying that your variation leads to a big ko.
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Yes, seems to be the strongest resistance but this ko seems catastrophicâŚ
Btw for ogs programers thatâs one more example of bugged demo if useful for debug (moves desappearing and such)
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One variation I can think of where White's answer is useful
Now the black stones are dead, but White 254 avoids a semedori: that is, White 254 makes sure that White doesnât have to lose points by playing inside their own territory to capture the black stones when Black plays all the dame around P6.
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Guess
S17
That was also my first guess, but not Mi Yutingâs move.
Yup!
In the game
Black T18, White captures, Black S17, and then White takes the ko, and they exchange ko threats for a while. Then Black plays a ko threat and White resigns, presumably because Black still has many ko threats and White doesnât have any other ko threat.
So why didn't Mi Yuting play jlt's move?
S17 and T18 both lead to almost the same ko.
Iâm guessing itâs because Black gains one local ko threat by sacrificing at T18. Black can play this sequence as a local ko threat that launches a new ko:
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Michael Redmond made a 30-minute video review of a super cool game, and it involves this tsumego in the Northwest corner:
He calls it a âclassicâ tsumego, with a fun tesuji for White to completely stop Black from making an eye in the corner. Except in the classic tsumego, White is not supposed to have a weakness at F16, so in the game Black plays at F16 at the appropriate time and lives.
So, in conclusion, these are the two tsumego:
White to play and kill.
Black to play and live.
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Letâs try. For problem 1,
White kills with C19:
Sequence 1: C19 - D18 - E18 - D19 - B18
Sequence 2: C19 - B18 - D18 and Black has a false eye.
For problem 2, F16 - G16 - G17 - H16 - C18 - C19 - D18 - E18 - C17 (atari) - D16 (connect) - E19 (atari) - G18 (capture) - B19.
Not 100% sureâŚ
Yup, all correct!
Problem 2 looks correct too, at least the idea is to make E19 sente.
(White should probably exchange A17 - A15 earlier otherwise it is too easy to make an eye?)
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