(;
GM[1]
SZ[19]
AW[ce][qq][ci][eq][fp]
AB[dc][qd][cp][dm][hp]
C[Problem 17. Black to play.  

Black wants to keep the two white stones on the lower left unsettled. How should he play ? ]
(;B[cq]
TE[2]
C[Correct Answer.  

Descending to Black 1 is a solid move. ]
;W[fn]
C[White has to jump to 2, so ... ]
;B[kp]
C[... Black can take up a position at the bottom by extending to 3. <= ]
)
(;B[dq]
C[Failure.  

Many player would instinctively attach with 1, but ... ]
;W[dr];B[cr];W[dp];B[cq];W[do]
C[... White would make shape with the sequence to 6. ]
;B[cn]
C[Black has to link up with 7, so ... ]
;W[jp]
C[... White will be able to attack the black stone at the bottom with a pincer at 8. <= ]
)
(;B[kp]
C[Failure.  

If Black extends with 1, ... ]
;W[cr]
C[... White can settle her stones by sliding to 2. Black has failed. <= ]
)
)