Really Important Game

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I started off from about 22 kyu, and my opponent is 18 kyu that time, so I feel my starting was bad, but I am not sure why my opponent keep saying good as I see that I didn't got a lot of the upper right territory and lower left territory. In other words, I didn't build enough territory for moyo. In the middle I still didn't realize how good I play, and I was shocked at almost end when I am about 20 points difference with opponent only. There is an invasion at the top left corner, which I didn't manage to play really well (one move I made is wrong until my opponent told me so). Hence, the endgame I didn't manage to pull about but just to make it there straight. 

Thanks to reviewer in advance if this game is reviewed. I really appreciate it. :)

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