(Beginner) Counting question

Baywa · Post by **Baywa** » Mon Jul 03, 2017 5:35 am

The game recording says W+16.5 for this game from the preliminary round of the 22nd Samsung Cup. With the komi of 6.5 points that means W+10 on the board. Now, my sgf-client and my counting by hand says W+9 on the board. Where's the error? Does Black have to cover once more in his own territory?

P.S. I added the last counting "frame" to the kifu. After removing the dead stones from the board, White has 25 and Black has 19 prisoners.

Pio2001 · Post by **Pio2001** » Mon Jul 03, 2017 10:59 am

Strange indeed.

Maybe the komi was in fact 7.5.

Vesa · Post by **Vesa** » Mon Jul 03, 2017 11:22 am

Could be a simple error in counting. The difference is so big that one lost prisoner doesn't matter.

Cheers,
Vesa

oren · Post by **oren** » Mon Jul 03, 2017 11:26 am

Also the recorder enters it manually and this is international. It's possible someone just mistyped and once it was in the system, it was done. The score isn't really important. Usually they get the winner right.

John Fairbairn · Post by **John Fairbairn** » Mon Jul 03, 2017 11:28 am

This is a known problem. I think the answer may be that the game came originally from a Chinese source. There White wins by 4.5 zi on the board, to which you add 3.75 zi komi, giving 8.25. The rule of thumb is to double that to get the Japanese score (e.g. as presented in Kin's pages). But the rule of thumb is dumb (new proverb!).

Pio2001 · Post by **Pio2001** » Mon Jul 03, 2017 2:34 pm

So, basically, you are saying that the game was typed by someone who is chinese and thought that the komi was 7.5, like in China ?

Baywa · Post by **Baywa** » Mon Jul 03, 2017 3:31 pm

Thanks! I thought there was something subtle that I missed! Since the margin was so large, I guess nobody really cared about one point more or less.

EdLee · Post by **EdLee** » Mon Jul 03, 2017 4:50 pm

Since the margin was so large, I guess nobody really cared about one point more or less.

Hi Baywa, it's not the margin but the principle that matters.
Pros (and AlphaGo!) are fighting for fractions of a point!

Calvin Clark · Post by **Calvin Clark** » Tue Jul 04, 2017 7:12 am

I noticed this game, too. Sometimes the reported score will not match your own count. A common class is games played with Ing Rules, where time penalty may be in effect and players sometime pay in points for extra time periods. If this is not noted in the game the recorded score might be very far from what the board shows. I was scratching my head recently on of those until I realized I was looking at game from the Chang-ki Cup, and then it hit me: oh, that Chang-ki.

Life In 19x19

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