(;
GM[1]
SZ[19]
AW[fc][fd][jc][qd][rd][re]
AB[ec][dd][df][mc][qc][pd][pe][qe][qj]
LB[qc:1]
C[Problem 139. White to play.  

How does White respond to Black 1 ? ]
(;W[rc]
TE[2]
C[Correct Answer.  

White first forces with 1, ... ]
;B[qb];W[qg]
C[... then jumps lightly to 3. <= ]
)
(;W[qg]
C[Failure.  

Jumping to 1 first allows Black ... ]
;B[rc]
LB[rf:A]
C[... to block with 2 in sente, he now threatens to play A. This is a setback for White. <= ]
)
)