Easy
M1
Easy
O14
Nope and nope 
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Summary
N14
L7
I found terrific’s second guess.
second one
wedge at L7
my first one is easier to read. 
good enough to get a B at least.
More about this one
After N14 black can seal white in and white doesn’t have two eyes. But it’s risky for black to kill. For example, N14, O14, N13, Q14, N15, R15, S14, S15, black’s corner is dangerous. Therefore, after blocking white I’d go for P8 cut as black
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Ah, only now I realized that you were answering for the two different boards 
O14 was my original plan in that game, but it doesn’t work:
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L7 is indeed the correct move on the last board
This squeeze gains 1 liberty and wins the capturing race:
Black can’t save both A and B:
Nice
Kitani Vs Shusai
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I will read later, my first thought is N6
Edit: ok, final answer.
Huh?
After N6, O6 makes two eyes!
My first thought is O3 (edit: doesn’t work).
It’s the same stupid looking shape that Kitani famously played against Shusai in the Meijin’s retirement game.
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Ok, just finished a game, tired(EXCUSE), must be O6 then.
Ah, this one!
I figured this was the game you were referring to, but didn’t remember any big groups dying, so didn’t make the connection 
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