Source: 
Problem diagram.
Black's response to the marked cut?
Masterpieces of Handicap Go
Otake 4p vs. Kitani Minoru 9p
Solution follows
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Not optimal.
Giving atari at 1 is not slack, however, when White turns at 4,
the game becomes slightly troublesome for Black.
After Black 7, White can aim at A, which would keep Black's top
group unsettled. So Black has bad aji here.
Best.
Playing Black 1 here is more accurate.
White would then live in the corner with 2.
But then Black 3, virtually capturing the cutting stone,
is painful for White.
White variation.
Pulling out the cutting stone with 2 is unreasonable here.
Black first makes a couple forcing moves at 3 and 5.
And then plays a skillful tesuji at 7 worth remembering.
White 8 is the only move, but Black's follow up throw-in at
9 is another tesuji worth remembering.
White must play 12 to live, but now White's 2 cutting stones
become meaningless.
White variation to previous diagram.
White 12 is an overplay.
Black 13 keeps the corner to 1 eye.
And White 14 cannot keep Black 15 from connecting his weak stones
out down the right side.
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