AFAIK:

• #77, #94, #95, #96 are still wide open.
• #93 is open, although Chinook played an excellent game of checkers.
• #91 was solved! Victor Allis' Ph.D. thesis has a chapter on this ("Go-Moku"). Note that Black's advantage in Go-Moku is considered huge, so in a sense this was unsurprising. What is surprising is that Allis managed to do it!

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