A extremely difficult blind spot

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trafficstars

Dear lightvector: I was just doing a selfplay between weight b28s7332 and b18s9996 with komi 3.5 and found this position

I set the engine only analyze N8

I also use 18b to analyze it ,however, after 1M visits ,it did not found the blind spot as well so I directly use it to analyze N8:

the winrate looks better. the sgf i paste here:

199.txt