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Offline cyclops
 Post subject: Do you read better than Lee Changho?
Post #1 Posted: Sun Apr 29, 2012 6:08 pm 
Lives in sente
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From recent KGS-plus lecture on yose by breakfast

Click Here To Show Diagram Code
[go]$$Wc punish w's timesuji
$$ . . . O O X . . . |
$$ . . O . O X . . . |
$$ . . O X X O X X . |
$$ X . O X . O O X . |
$$ . O . X O O O X . |
$$ . . O . O X X O 1 |
$$ . . . . . . . X . |
$$ ------------------+[/go]


edit: hint
White, in byomi, needed sente and some time to win the game and he succeeded. Lee Changho failed to punish :w1: .
:w1: should have been at Q1, a big sente move. In the game B had the chance to pay a small fee and grab sente. The tesuji is some moves later and not quite open in the air.
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Offline Tryss
 Post subject: Re: Do you read better than Lee Changho?
Post #2 Posted: Mon Apr 30, 2012 10:23 am 
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This?

Click Here To Show Diagram Code
[go]$$Wc
$$ . . . O O X . . . |
$$ . . O . O X . . . |
$$ . . O X X O X X . |
$$ X . O X . O O X . |
$$ . O . X O O O X . |
$$ . . O . O X X O 1 |
$$ . . . . . . 2 X . |
$$ ------------------+[/go]


Now if white tenuki, black has a nasty ko with the descent at O2 (white take first, but it's huge), and P1 is not sente for white (black can recapture)


If I'm right : Youhouu \o/
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Offline cyclops
 Post subject: Re: Do you read better than Lee Changho?
Post #3 Posted: Tue May 01, 2012 3:32 pm 
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The question remains why Tryss' move for b results in a better result for him than if w has played correctly. That is why:

Click Here To Show Diagram Code
[go]$$Wc W's correct play giving him sente
$$ X . O O X . |
$$ X O O O X . |
$$ . O X X O 2 |
$$ . . 1 . X . |
$$ ------------+[/go]


as above is better for w than Tryss' punishment of :w1: at 2 as in the diagram below:
Click Here To Show Diagram Code
[go]$$Wc w gets the same sente result, isn't he?
$$ X . O O X . |
$$ X O O O X 4 |
$$ . O X X O 1 |
$$ . 3 . 2 X . |
$$ ------------+[/go]


?

So who wins the "better than Lee Changho" title?


Last edited by cyclops on Tue May 01, 2012 6:19 pm, edited 2 times in total.
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Offline HermanHiddema
 Post subject: Re: Do you read better than Lee Changho?
Post #4 Posted: Tue May 01, 2012 3:36 pm 
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Tryss already noted in his post that: "P1 is not sente for white (black can recapture)". Showing he noticed the under the stones in the corner.
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Offline Magicwand
 Post subject: Re: Do you read better than Lee Changho?
Post #5 Posted: Tue May 01, 2012 4:11 pm 
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:w3: is not sente because
Click Here To Show Diagram Code
[go]$$Wc
$$ X . O O X . |
$$ X O O O X 6 |
$$ . O X X O 1 |
$$ . 3 5 2 X 7 |
$$ ------------+[/go]

Click Here To Show Diagram Code
[go]$$Wc
$$ X . O O X . |
$$ X O O O X X |
$$ . O . 8 O O |
$$ . O O . . O |
$$ ------------+[/go]

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"The more we think we know about
The greater the unknown"
Words by neil peart, music by geddy lee and alex lifeson
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Offline cyclops
 Post subject: Re: Do you read better than Lee Changho?
Post #6 Posted: Tue May 01, 2012 6:13 pm 
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OK, problem solved, thx HH and MW, the title goes to Triss!!
edit: In the real game Lee Changho as B didn't tenuki as in MW's diagram. So W kept sente to play the winning endgame move elsewhere.
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