EVENT
BOARDSIZE 19
SETUP W D17 F17 C16 C15 D4 
SETUP B C14 D15 D14 Q4 Q10 Q16 
MARK 1@D15 2@C15 3@C14 4@C16 5@D14 6@F17 7@Q10
COM
Problem 13. White to play.  

After White 6, Black does not complete the joseki, but rushes
to make a sanren-sei with 7. What should White do ? 
ENDCOM
W 1 D10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should pincer Black's stones with 1 to make them heavy.
ENDCOM
  VAR
  W 1 K4
  COM
  Failure.

  White 1 is a good move because it erases the influence of Black's
  sanren-sei. However, it is bigger to attack the black stones
  on the upper left side.
  ENDCOM
  B 2 D10
  MARK \t@Q10
  COM
  Black has now played the important moves of 2 and the marked
  stone on the right side.
  <=
  ENDCOM
  ENDVAR
B 2 G15
COM
If Black escapes into the center with 2, ...
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W 3 H16
COM
... White takes profit at the top with 3 while keeping up the
pressure on the black stones.
<=
ENDCOM