EVENT
BOARDSIZE 19
SETUP W D16 D13 C6 D4 K4 O5 O3 O2 N18 O17 P16 P15 
SETUP B P3 Q4 Q6 O7 R10 F17 J16 R16 P17 Q14 Q17 Q18 P19 O18 
MARK 4@P19 2@Q17 3@N18 1@P16 \t@P18
COM
Problem 154. White to play.  

The white stone that has been at the marked point has been working
overtime: White has been able to make two ataris pivoting on
this stone. However, the next move is the really important one
and, if White misses it, all her good work could go to waste.
ENDCOM
W 1 M15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

When you are trying to make sabaki, you must play lightly. White
1 makes a resilient shape. This is a beautiful move.
ENDCOM
  VAR
  W 1 N16
  COM
  Failure.

  White 1 may look like an efficient move, since it protects all
  the cutting points, but ...
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  B 2 M17
  COM
  ... it results in a heavy shape after Black peeps at 2.
  ENDCOM
  W 3 N17
  COM
  Because White has tried to save all of her stones, they will
  all come under attack.
  <=
  ENDCOM
  ENDVAR
B 2 N17
COM
There is nothing to worry about if Black cuts at 2.
ENDCOM
W 3 M17
MARK \t@O17
COM
Just atari at 3 and sacrifice the marked stone.
ENDCOM
B 4 O16
COM
After Black captures with 4, ...
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W 5 O15
COM
... White plays 5 and all of her stones are working efficiently.
When you are trying to make sabaki, you have no responsibility
to save all your stones. All you want to do is to establish a
viable presence in the area you are fighting.
<=
ENDCOM