I have 4 corners, two of which reasonably big, nobody has anything in the middle, sides are shrunk... I was sure, I was about 10-15 points ahead.

After counting, I was shocked to see that lost by 1,5 points. Since a wrong estimation cannot possibly be so wrong, this is a clear proof that the game of Go itself is wrong!

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If you say no, Elwood and I will come here for breakfast, lunch, and dinner every day of the week.

Yes. For games like this, komi should be reduced to 4.5 pts.

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Patience, grasshopper.

Why did you remove a stone with 209 in the game (N15). That looks like a 2-point loss in gote. If you had played the hane at K19 instead (3-point gote play), you would have been five points better off. Also 237 was a pass, it merely threatens to take the ko next (which never happens in the game). Playing K13 looks better.

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Dave Sigaty
"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21

Dont worry you are only 2 kyu . If you improve you will see the game differently.
You and your oppenent played a lot of bad moves and because you are only 2 kyu i guess you can count exactly so dont worry .

With 209 I misread something and though there was a danger from the left hand side. Didn't bother to read very carefully though, because I was 15 points ahead anyway

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If you say no, Elwood and I will come here for breakfast, lunch, and dinner every day of the week.

Here are some comments, mainly on the start of the game.

EDIT: First comment should say "make you feel worse", not "less worse" :p

I think that trying to save R6 was a very risky policy. ( I would have abandoned them. )

But once you have committed yourself to saving them, you should do so thoroughly. In particular, move 61 should have been something like J10 or M9.

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Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207

For what it's worth, move 173 was equivalent to a pass, and it looks like you lost ~12 points (Bill can give us an exact number) when white played 174.

Without komi, white was 5 points behind. That doesn't seem so far off from 10 points. For a visual estimation based on instinct and not actual counting, that seems pretty close.
Mr. Nash, you have an excellent, if very subtle, sense of humor.

As a non native I wanted to check whether your use of the word "if" is correct here. My Longman dictionary gives the example: "She is a pleasant if noisy child." So that settles the issue.
Next I checked "lemmata". I believed it was plural of the greek word lemma. But that is not in the dictionary. Now I believe it is from the Latin word lemma, lemmatis. But its plural is lemmates. So can you explain yourself, mr lemmata?

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I think I am so I think I am.

Indeed I can. "Lemmata" is an English word with Greek origin. The original form of words tend to become corrupted when they are imported into the English lexicon. The simplest explanation is often the best one.