Red up to move 12 has only effective got one cannon across the river, one H2+3 and one R1+1.
Compare that with black's development, I'd say, Red lost because of the lack of development of pieces in early stage.
Though I'm not a good player, I think this is basically how red lost, simply because he did not develop well.
Looking at 几度 game comments, I'd say read up to his move 9 and that's all. From move 12 onwards, it's really a downhill spiral already.
Move 7: I'd consider R1+1. It maintains a good overall position and development. Black would try H2+4, then red R1.4 or C5.6, C8+2(?). There's better balance this way. Hope that helps.
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