(;
GM[1]
SZ[19]
AW[dd][qf][qi][rn][qp][qq][or][dr][er][eq][fr][bm][cm][dn][co][dp][bp][cp][em]
AB[qd][oc][pl][pp][po][mp][bq][cq][dq][fq][gq][ep][eo][en][dm][dl][dk][cl][bl]
TR[qf]
C[Problem 103. Black to play.  

White has just made the checking extension with the marked stone. What should Black do ? ]
(;B[pj]
TE[2]
C[Correct Answer.  

Black should make a shoulder hit with 1 and build a moyo in the center. ]
(;W[pi]
C[If White pushes up with 2, ... ]
;B[oi]
C[... Black plays a two-step hane with 3 ... ]
;W[oh];B[nh]
C[... and 5. ]
;W[oj]
C[If White ataris with 6, ... ]
;B[ni]
C[... Black connects with 7 and ... ]
;W[pk];B[ok];W[qj];B[nj]
C[... the sequence continues up to 11. Black has mapped out a huge moyo in the center. <= ]
)
(;W[oh]
C[If White plays the knight's move of 2, ... ]
;B[ni];W[nh];B[mi];W[mh];B[li]
C[... Black maps out a moyo with the sequence to 7. ]
;W[eh]
C[In the game from which this problem was taken, White plays 8 to cut down on the scale of this moyo. <= ]
))
(;B[oi]
C[Failure.  

Capping with Black 1 is thin. ]
;W[of]
LB[oj:A]
C[After 2, White can aim at the attachment of A. <= ]
)
)