Source: 
Problem diagram.
Black's response to the marked play?
Masterpieces of Handicap Go
Kato Masao (age 11) vs. Shiratori Sumiko 3p
Solution follows
(or click here to download SGF)
Big, but not best.
In the game, Kato (as an 11 year old) played Black 1.
Last week's problem (from much earlier in this game though)
suggested this as the best move to put pressure on the
White stone. But now, later in the game, the right side has
become more important.
White 2 takes the initiative on the right, while leaving the
left side stone as light.
White 4 seizes the big lower right corner.
With 5, Kato plays in the wrong direction again.
Through 11, White has raided the corner and settled his lower
group in sente. And Black really only has about 10 points of
territory on the lower right side.
Black variation.
Deviating from the previous diagram with Black 5 would have
at least recovered something out of the position for Kato.
Black could have then belatedly taken the strategic
point at 7.
Correct.
Black 1 is the best point on the board.
Black moves out into the center while simultaneously threatening
the weak White groups above and below. White has a difficult
fight ahead.
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