(;
GM[1]
SZ[19]
AW[dc][gc][id][di][dj][fi][ek][gk][ik][pp]
AB[he][fe][ce][dk][dl][el][dp][gm][pd]
LB[dq:C][im:A][jp:B]
TR[ik]
C[Problem 115. Black to play.  

White runs away with the marked stone. Should Black continue attacking with A, map out a moyo with B or secure territory with C ? ]
(;B[dq]
TE[2]
C[Correct Answer.  

The first thing Black must do is to defend his territory on the left by enclosing with 1. ]
(;W[nc]
C[If White next approaches with 2, ... ]
;B[jf]
C[... Black exchanges 3 ... ]
;W[kd]
C[... for 4, ... ]
;B[jq]
C[... then maps out a moyo with 5. <= ]
)
(;W[jq]
C[If White 2 here, Black will play at the top. <= ]
))
(;B[im]
C[Failure.  

Black 1 is not a very forceful attack. ]
;W[cq]
C[White will snatch the corner territory from Black with the 3-3 point invasion of 2. <= ]
)
(;B[jp]
C[Failure.  

Against Black 1 here, ... ]
;W[cq]
C[... White will also invade at 2. <= ]
)
)