Sunjang Baduk Counting / Real Example 1

On [ext] MSO the position below is said to score as W+0.5 (57 - 53 +4.5 ) under old Korean rules. Let's check:

[Diagram]
Final Position  

B Ch'ae Keuk-mun
W No Sa-ch'o

[Diagram]
Dame Filled  



[Diagram]
Dead Stones Removed  



[Diagram]
Internal Stones Removed  



[Diagram]
Position to Count  



That's

   -11   11   11   -5
              -7
    14    3        -7
    -8    5  -15   13
  ---------------------
         57 - 53

With 4.5 komi, White won with half a point.

This in mind, Bill took Black's side. See his [ext] analysis.

Robert Pauli: How about putting your analysis here, Bill? But

  • Shouldn't 17 in D3 be on 18? (One threat more without a cost: the captive doesn't count.)

Bill: Very nice. It has been a long time, but I think I looked at that. If so, I missed the fact that Black need not play the atari, which gives White two threats for one.

A reanalysis might show that Black can win by more.

  • Shouldn't 32 take the stone below 28? Something is missing here.

Bill: Big booboo. White should interpolate 32-33 first, though. I haven't taken the time to really check, but I think that occurred in the write-up, and that the result is the same.

Bill Fraser pointed that out to me around 3 years ago. I would have posted a correction, but the MSO site was dormant by that time.

axd: in the initial end position, there are 4 more W stones than B; assuming W has 4 more prisoners than B, and komi=4.5 gives Kor:W+0.5 Chin:B+0.5, Jap:B+1.5. It would be interesting to present a game where the score shows a substantial difference as compared to Chin/Jap. scoring.

psygo?: Where can I find the whole sgf file for this sunjang game (and maybe others)?


Sunjang Baduk Counting / Real Example 1 last edited by psygo on July 19, 2018 - 04:35
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