<p>You are right that the top right belongs to White with correct play, but according to the programme <a href="https://github.com/SabakiHQ/Sabaki" rel="nofollow noreferrer">Sabaki</a> White wins by one point (because they have a captive). It is conceivable, but somewhat unlikely, that White could make enough errors for Black to win.</p>
<h3>The score</h3>
<p>Sabaki calculates the score like this for <a href="https://senseis.xmp.net/?AreaScoring" rel="nofollow noreferrer">area scoring</a>:</p>
<p><a href="https://i.sstatic.net/7CmsA.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/7CmsA.jpg" alt="enter image description here" /></a></p>
<p>and like this with <a href="https://senseis.xmp.net/?TerritoryScoring" rel="nofollow noreferrer">territory scoring</a>:</p>
<p><a href="https://i.sstatic.net/t5WtC.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/t5WtC.jpg" alt="enter image description here" /></a></p>
<h3>The top right</h3>
<p>To be on the safe side, I plugged your SGF into <a href="https://github.com/lightvector/KataGo/" rel="nofollow noreferrer">KataGo</a> (via Sabaki), and it showed me a ko in the top right that Black cannot win: not only do they have hardly any threats, even if they did, they could not finish the ko in their favour.</p>
<p>The sequence that KataGo found was this:</p>
<pre><code>$$Bcm1 Trying for a ko
$$ +---------+
$$ |..XOO.a25|
$$ |.X.XO.O1c|
$$ |..,XXO4d3|
$$ |.XXXXXOOO|
$$ |..XOXOXXO|
$$ |XXOOOOX.X|
$$ |OOOOOX.X.|
$$ |....OX.X.|
$$ |.O..OOX..|
$$ +---------+
</code></pre>
<p>Unfortunately for Black, White simply has to connect with ➅ at <strong>a</strong> and Black has no way of finishing the ko to kill White. White can just wait for Black to run out of threats and then capture at <strong>c</strong> and <strong>d</strong>.</p>
<p>Black’s only chance is if White plays the ko wrongly, for example:</p>
<pre><code>$$Wcm6 White messes up (9 retakes, 13 @ 7)
$$ +---------+
$$ |..XOO36OX|
$$ |.X.XO2OX1|
$$ |0.,XXOO.X|
$$ |9XXXXXOOO|
$$ |57XOXOXXO|
$$ |XXOOOOX.X|
$$ |OOOOOXxX.|
$$ |....OX.X.|
$$ |.O..OOX..|
$$ +---------+
</code></pre>
<ul>
<li>capturing ➅ instead of connecting at ⓫,</li>
<li>threatening with ➉ instead of the deadlier threat at <strong>x</strong>,</li>
<li>missing <strong>x</strong> again after Black takes at ⓫ and therefore giving up the ko, so</li>
<li>Black wins by 27 (area) or 26 (territory).</li>
</ul>

CC BY-SA 4.0
2020-09-07T21:01:48.737Z
2020-09-07T21:22:21.893Z
2020-09-07T21:22:21.893Z
PJTraill
<p>Cosumi claims that I won this game by 37 points:</p>
<p><a href="https://i.sstatic.net/SK8jw.png" rel="noreferrer"><img src="https://i.sstatic.net/SK8jw.png" alt="Go board with even territory between the two sides" /></a></p>
<p>— <a href="https://www.cosumi.net/en/replay/?b=You&amp;w=COSUMI&amp;k=0&amp;r=b37&amp;bs=9&amp;l=0&amp;gr=dfgdedcfcecggehdhefcfdgbdcdgbfbgafdecdeffgagbdffgfehfhebdbfigieihhdacaeabbieifidhgfeecegeedfddbitttt&amp;ds=daeaebgbfcgdhdidie&amp;bm=gdgieb" rel="noreferrer">[9×9, Level 0] Black(You) Wins by 37 Points - Go Browser Game COSUMI</a></p>
<p>But it looks even to me.</p>
<p>Am I missing something, or does the site sometimes get the score completely wrong?</p>
<p>EDIT:</p>
<p>Strange.  The next morning, the same URL shows the upper-right corner as captured:</p>
<p><a href="https://i.sstatic.net/t8LVn.png" rel="noreferrer"><img src="https://i.sstatic.net/t8LVn.png" alt="enter image description here" /></a></p>
<p>That might account for the score but, as far as I can tell, White still owns that territory.</p>
<p>Something strange is going on here.  (Does Cosumi have a bug-reporting mechanism?)</p>

CC BY-SA 4.0
2020-09-07T09:23:45.167Z
The score is wrong, both white groups are alive
Pablo Lozano
<go><scoring>
Does the Cosumi Go site sometimes get the score wrong?
Ray Butterworth
# Does the Cosumi Go site sometimes get the score wrong?

(Asked by: username_0 on 2020-09-07)

Cosumi claims that I won this game by 37 points:

[![Go board with even territory between the two sides](https://i.sstatic.net/SK8jw.png)](https://i.sstatic.net/SK8jw.png)

— [[9×9, Level 0] Black(You) Wins by 37 Points - Go Browser Game COSUMI](https://www.cosumi.net/en/replay/?b=You&w=COSUMI&k=0&r=b37&bs=9&l=0&gr=dfgdedcfcecggehdhefcfdgbdcdgbfbgafdecdeffgagbdffgfehfhebdbfigieihhdacaeabbieifidhgfeecegeedfddbitttt&ds=daeaebgbfcgdhdidie&bm=gdgieb)

But it looks even to me.

Am I missing something, or does the site sometimes get the score completely wrong?

EDIT:

Strange. The next morning, the same URL shows the upper-right corner as captured:

[![enter image description here](https://i.sstatic.net/t8LVn.png)](https://i.sstatic.net/t8LVn.png)

That might account for the score but, as far as I can tell, White still owns that territory.

Something strange is going on here. (Does Cosumi have a bug-reporting mechanism?)

**Tags:** go, scoring

> **Comments:**
> **username_1**: The score is wrong, both white groups are alive  

---

## 1 answers

### Answer by username_2 on 2020-09-07. Score: 3

You are right that the top right belongs to White with correct play, but according to the programme Sabaki White wins by one point (because they have a captive). It is conceivable, but somewhat unlikely, that White could make enough errors for Black to win.
The score
Sabaki calculates the score like this for area scoring:

and like this with territory scoring:

The top right
To be on the safe side, I plugged your SGF into KataGo (via Sabaki), and it showed me a ko in the top right that Black cannot win: not only do they have hardly any threats, even if they did, they could not finish the ko in their favour.
The sequence that KataGo found was this:
$$Bcm1 Trying for a ko
$$ +---------+
$$ |..XOO.a25|
$$ |.X.XO.O1c|
$$ |..,XXO4d3|
$$ |.XXXXXOOO|
$$ |..XOXOXXO|
$$ |XXOOOOX.X|
$$ |OOOOOX.X.|
$$ |....OX.X.|
$$ |.O..OOX..|
$$ +---------+

Unfortunately for Black, White simply has to connect with ➅ at a and Black has no way of finishing the ko to kill White. White can just wait for Black to run out of threats and then capture at c and d.
Black’s only chance is if White plays the ko wrongly, for example:
$$Wcm6 White messes up (9 retakes, 13 @ 7)
$$ +---------+
$$ |..XOO36OX|
$$ |.X.XO2OX1|
$$ |0.,XXOO.X|
$$ |9XXXXXOOO|
$$ |57XOXOXXO|
$$ |XXOOOOX.X|
$$ |OOOOOXxX.|
$$ |....OX.X.|
$$ |.O..OOX..|
$$ +---------+


capturing ➅ instead of connecting at ⓫,
threatening with ➉ instead of the deadlier threat at x,
missing x again after Black takes at ⓫ and therefore giving up the ko, so
Black wins by 27 (area) or 26 (territory).


---

