(;
GM[1]
SZ[19]
AW[ed][fd][fc][pp][dp][fq]
AB[cd][dc][ec][qd][bp][cn]
LB[de:A][cf:B][df:C]
C[Problem 113. Black to play.  

In the upper left corner, all the moves from A to C are josekis, but, in relation to Black's other stones, only one of these choices is correct. Which one is it ? ]
(;B[de]
TE[2]
C[Correct Answer.  

The diagonal move of Black 1 is best. ]
;W[jc];B[oc];W[cq];B[ck];W[qm];B[pj];W[mc];B[kq]
LB[ck:5][de:1]
C[The sequence to 9 is one possible continuation. Black 5 and the stone at 1 make an ideal high-low balance on the left side. <= ]
)
(;B[cf]
C[Failure.  

If Black 1, all his stones on the left are low. ]
(;W[jc];B[oc]
C[<= ]
)
(;B[df]
C[Failure.  

If Black 1 here, ... ]
;W[ch]
C[... White 2 is a severe attack. <= ]
)
(;W[cq]
C[If White 2 next, ... ]
;B[dl]
LB[cj:A]
C[... Black plays 3 to maintain a high-low balance, but then an invasion at A remains. <= ]
))
)