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Tragedy strikes in the Judan Sen.
http://www.lifein19x19.com/viewtopic.php?f=13&t=7786		 Page 1 of 1
Author:  ez4u [ Fri Feb 01, 2013 4:58 am ]
Post subject:  Tragedy strikes in the Judan Sen.
From Takao Shinji's Blog. White (Takao) to play. As he wrote, "In this position, if the center White stones live, White wins the game." Both "a" and "b" seemed good to connect to the right. But then, presumably in byo yomi, White got wrapped up in the question, "Which of them keeps more points?" He forgot that the balance of territory was already decided as long as he safely connected. As he put it, "Tragedy struck", and Yuki Satoshi will challenge Iyama Yuta for the title in March.

Click Here To Show Diagram Code
[go]$$Wc Takao Shinji - Yuki Satoshi; Judan Challenger Final, 2013-01-31
$$ ---------------------------------------
$$ | . X . . . . . . . . O . . . . . . . . |
$$ | X O . X O . . . . X O O O . O O O X . |
$$ | . X X . O . . . . X X X X O . O X . . |
$$ | . X O O . . . . . , . . . X O X X X . |
$$ | . O . . . . O . O . . . . X . . X . . |
$$ | . . O . . X O . . . . . . X X X O O . |
$$ | . . . . O . O . X . X . . . . . O . . |
$$ | . O X . . . . O . . . . . . . . . . . |
$$ | . O X X X X X O . X . . . X . X . O . |
$$ | . . X O O O O X X , . . . O . , O X . |
$$ | . . X . . X O O X . a X . O O . O O . |
$$ | . . . X O . . . X O X . b X . O X X . |
$$ | . O X . . O O O O O X O . X . O O X . |
$$ | O O O X X . X . X O O . X . O . O X . |
$$ | . O X O X X . X . X O . . . . . X X . |
$$ | . O X O . . . . . , X X . . X X X O X |
$$ | . . X O O X . . . . X . O X X O O O O |
$$ | . O X O X X . . . . . . . X O O . O . |
$$ | . . O . . . . . . . . . . X X O . . . |
$$ ---------------------------------------[/go]

So which one works and which one did not work in the game? Answer is below.

Takao played :w1: and :w3: but resigned on seeing :b4: when he realized that the sequence Wa, Bb, Wc, Bd, We, Bf, Wg would lose to Bh.
Click Here To Show Diagram Code
[go]$$Wc Takao Shinji - Yuki Satoshi; Judan Challenger Final, 2013-01-31
$$ ---------------------------------------
$$ | . X . . . . . . . . O . . . . . . . . |
$$ | X O . X O . . . . X O O O . O O O X . |
$$ | . X X . O . . . . X X X X O . O X . . |
$$ | . X O O . . . . . , . . . X O X X X . |
$$ | . O . . . . O . O . . . . X . . X . . |
$$ | . . O . . X O . . . . . . X X X O O . |
$$ | . . . . O . O . X . X . . . . . O . . |
$$ | . O X . . . . O . . . . . . . . . . . |
$$ | . O X X X X X O . X b . f X . X . O . |
$$ | . . X O O O O X X , c 3 d O . , O X . |
$$ | . . X . . X O O X a 1 X e O O . O O . |
$$ | . . . X O . . . X O X 2 4 X . O X X . |
$$ | . O X . . O O O O O X O . X . O O X . |
$$ | O O O X X . X . X O O . X h O . O X . |
$$ | . O X O X X . X . X O . g . . . X X . |
$$ | . O X O . . . . . , X X . . X X X O X |
$$ | . . X O O X . . . . X . O X X O O O O |
$$ | . O X O X X . . . . . . . X O O . O . |
$$ | . . O . . . . . . . . . . X X O . . . |
$$ ---------------------------------------[/go]

:w1: below was the right way to go, creating a vital shortage of liberties. Black can no longer cut at "a". Note that Black can not avoid this by moving out with the upper stones because a White connection at 2 threatens to hane underneath at "b" and capture the lower Black stones.
Click Here To Show Diagram Code
[go]$$Wc Takao Shinji - Yuki Satoshi; Judan Challenger Final, 2013-01-31
$$ ---------------------------------------
$$ | . X . . . . . . . . O . . . . . . . . |
$$ | X O . X O . . . . X O O O . O O O X . |
$$ | . X X . O . . . . X X X X O . O X . . |
$$ | . X O O . . . . . , . . . X O X X X . |
$$ | . O . . . . O . O . . . . X . . X . . |
$$ | . . O . . X O . . . . . . X X X O O . |
$$ | . . . . O . O . X . X . . . . . O . . |
$$ | . O X . . . . O . . . . . . . . . . . |
$$ | . O X X X X X O . X . . . X . X . O . |
$$ | . . X O O O O X X , . 5 a O . , O X . |
$$ | . . X . . X O O X 7 3 X . O O . O O . |
$$ | . . . X O . . . X O X 4 1 X . O X X . |
$$ | . O X . . O O O O O X O 6 X . O O X . |
$$ | O O O X X . X . X O O 2 X . O . O X . |
$$ | . O X O X X . X . X O . b . . . X X . |
$$ | . O X O . . . . . , X X . . X X X O X |
$$ | . . X O O X . . . . X . O X X O O O O |
$$ | . O X O X X . . . . . . . X O O . O . |
$$ | . . O . . . . . . . . . . X X O . . . |
$$ ---------------------------------------[/go]
Author:  xed_over [ Fri Feb 01, 2013 5:31 pm ]
Post subject:  Re: Tragedy strikes in the Judan Sen.
oooh... I remember watching this game.
thanks for the explanations.
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