Late endgame exercise - Fujitsu 4 Game 16

    Keywords: EndGame, Question
 Event: 4th Fujitsu Cup [ext] on Jan van der Steen's web site
 Round: Round 2, 8
 Date: 1991-04-08
 Place: Tokyo (Nihon Ki-in), Japan
 Black Player: Cho Hun-hyeon
 Black Rank: 9 dan
 White Player: O Rissei
 White Rank: 9 dan
 Komi: 5.5
 Result: W+3.5
 Source: 1992 Kido yearbook
[Diagram]
Position at the end of the game record (move 242). Black to play.  
 Captured stones:
 B: 1
 W: 10

The top-left corner is a seki.

Can Black actually win the semeai in the top-right corner? It doesn't seem possible. Then White should win by 17.5, not 3.5!

Any idea?


Black is dead in the top right, and the score is W+3.5.

Black is dead, basically because in the semeai, White has an eye and Black doesn't (MeAriMeNashi).

To count the score:

 White in bottom left: 34 points.
 White in top right: 62 points.
 White in top middle/left: 2 points.
 White's prisoner: 1 points.
 Komi: 5.5 points.
 White's total: 104.5

Black's territory:

(What a pain, it is all in one lump, which makes it easy to lose count. I'll divide it artifically.)

 Black territory, rows 7 and above: 25 points.
 Territory from dead white stones in the Black territory: 30 points.
 Other Black territory, rows 1 to 6: 36 points.
 Black's prisoners: 10 points.
 Black's total: 101

(I hope that was comprehensible, everyone has their own way of counting.)

--Tim Hunt


Thanks for the help. I must have done something wrong to get such a big difference. Have to check again. Still, I don't understand why you count 2 points for White in the top left. It's a seki isn't it? The game was played in Tokyo so I suppose Japanese rules were in use.

--jvt

Sorry, I wasn't clear. It is a seki in the top left corner, but there is another white group in the top left quarter of the board, and I was referring to that.

--Tim Hunt


I see. Then White won by 3.5.

--jvt


To answer to the original question : black cannot kill the white group in the upper right corner. It's me ari me nashi, and black has not enough outside liberties.

--lko?


Late endgame exercise - Fujitsu 4 Game 16 last edited by Hu on July 9, 2006 - 03:36
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