This is the only game I got a comment for so far, so, of course, I showed the game I lost...
(It was also the only game Benjamin lost at that event - see his diary)
Comment by Kenmochi-Sensei
1: Now White is heavy.
3: Has to play hane at a
4 and 6: These make Black stronger, so it's better not to play them, as White maybe wants to attack with b later instead.
1: Bad shape. Connecting at c is better.
2: After 34 and are 36 played, this invasion is no longer fun.
3: Small. Better around d.
6: Very bad, as it just cuts two strong groups. Has to be at e. After a black move at 6, white would just play d, as the two stones left of 6 aren't worth defending then.
8/10: Should also be at e.
9: Looks a bit slack.
Variation 2: White sacrifices some stones to get thickness and sente and takes the free corner afterwards. Probably the game is close then.
2: Maybe the losing move. f would be the Ko-Threat. Now white comes under heavy attack, but even after he lives he is behind.