Speaking of losing a won game… I always manage to do it in Byo-yomi (and he definitely should have resigned LONG before). See SGF or VIEW.
To give you an idea of just HOW big I lost by, the result was W+64.5, and I should have connected at P17 or after at Q19. I did amazingly well at Life and Death and Attack and Defense up until this point. In this case, I definitely should have spent a few moves of my Byo-yomi (which I never seem to like to do…)
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