6: Like Araban says, this is premature. A useful rule of thumb is that an isolated invasion of a 4-4 is best done after the opponent plays a stone on each wing. ( by 'isolated', I mean that there are no friendly stones like a 6-3 approach nearby )
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[go]$$W Premature.
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[go]$$W Not yet. Maybe 'a' instead.
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[go]$$W Now is a good time.
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[go]$$W This is good timing too.
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14: Again, Araban is correct, but perhaps some more explanation is in order.
Another general rule of thumb is that each stone in a wall is worth 2.5 to 3 points. This value can vary widely depending on circumstances, but you can usually be sure that it is 2+.
So when you play at S13 and he replies at R12, you have gained 1 point, but he has gained at least 2. That is a net loss for you of at least one point for every move you make crawling along the second line.
If you must crawl along the second line to make a group safe, then do it. ( S15 and S14 are fine moves in this situation. ) But as soon as you are alive, stop crawling and play something bigger someplace else.
19: Yes, your opponent missed joseki.
Question: How will you exploit that mistake?
Answer:
24: Looks fine to me.
41: Yes, he definitely approached from the wrong side.
44: This is really dangerous. You have an iffy group up top, and now you start another group low on the side. He will probably be able to make moves that threaten both. If you want to prevent the growth of his upper left side, the best you can do is something like E11.
56: You should die here. Luckily for you, he misplays the attack.
72: Again, a continuation of a horrible sequence by your opponent. Even if you survive in the corner, he should build enough strength to turn and kill your upper side group. You should have died there.
80: A crosscut like this - when your opponent has the extra local stone - is generally used when you he has surrounding influence, and you need to start a quick local fight that is over and done with before his influence can be brought to bear. But in this instance, you have most of the nearby influence with M4. So you want to start a slow fight so that your M4 stone will have some effect.
S3 is the only play here. If he tries one of the standard josekis ( S3, Q3, etc ) you will get territory, and he will get influence. But he will find that much of his newly created influence is neutralized by your M4 stone.
You will be safe in the corner, and he will be vulnerable to your attacking moves like M6 and N3. He will scramble for life, while you make big territory on the lower side.
I don't have time to comment about moves 86-100 in detail, but in general I observe that it is the third time in one game in which you start an invading group deep in your opponent's area of influence when a reduction may well have been the better play.
Think more about reducing from the outside.