I'm certainly no go expert, but I love the idea of a go puzzle, so I'll at least give you a strawman argument to beat up on. It seems to me the aliveness of the black group around 10,10 is the critical issue. If I was black, I'd play at 12,6 to try and connect to the threatened group. If I was white, I'd play at 13,8 and I think I can eventually capture the black group.
Scott
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