(;
GM[1]
SZ[19]
AW[ci][cn][md][mg][db][fc][hd][cb][en][mi][dk]
AB[dp][pd][pp][dd][cc][df][fp][jd][jf][jh][pf][bb][gn][dl]
LB[dl:1][dk:2]
C[Problem 124. Black to play.  

The game in Problem 120 continued with the exchange of Black 1 for White 2. What should Black do next ? ]
(;B[ck]
TE[2]
C[Correct Answer.  

Black 1 is a strong move. ]
;W[ek]
C[If White extends to 2, ... ]
;B[cj];W[di];B[el];W[fl];B[cm]
C[... Black makes shape with the sequence to 7. ]
(;W[bn]
C[If White 8, ... ]
;B[fm]
C[... Black hanes at 9, splitting the white stones above from the ones below. <= ]
)
(;W[fm]
C[If White 8 here, ... ]
;B[co]
C[... Black links up with 9. <= ]
)
(;W[cp]
TR[cm]
C[Continuation.  

After Black played the marked stone, White might make sabaki with 8, but ... ]
;B[fm];W[em];B[bn];W[bo];B[dj];W[ej];B[bm];W[do];B[fk];W[gl];B[ei];W[fj];B[gk];W[hl];B[bi];W[fi];B[eh]
C[... Black secures a large territory on the left with the sequence to 18, ... ]
;W[hj];B[dq];W[cq];B[ip]
LB[dq:27]
C[... then secures some more stones at the bottom with 27 and 29. <= ]
))
(;B[el]
C[How the game continued.  

Black 1 revealed a negative attitude. ]
;W[cl];B[ck];W[bk];B[cm];W[bl];B[dm];W[bm]
C[White was able to link up her stones on the left and take some profit with the sequence to 8. ]
;B[dn]
C[If Black were to play at 9 after this, ... ]
;W[co]
LB[do:A]
C[... White would extend to 10 ant threaten to push in at A. ]
;B[do]
C[Therefore, Black would defend there and White would wrest the corner away from Black. <= ]
)
)