(;
GM[1]
SZ[19]
AW[cf][hd][fj][dm][hb][hc][ef][eg][cp][co][md][nc][oc]
AB[jp][jd][pj][dj][dp][pd][pp][dd][fp][pn][fd][cd][ee][gc][ff][dq][pc][nd][ne][gb]
LB[cp:1][co:3][dq:2]
C[Problem 25. Black to play.  

The game in Problem 21 continued with White 1 and 3. How should Black attack ? ]
(;B[fg]
TE[2]
C[Correct Answer.  

Black should first push with 1, ... ]
;W[eh]
C[... forcing White to defend with 2, ... ]
;B[kc]
LB[el:B][mc:A]
C[... then play die diagonal move of 3, keeping White's stones at the top separated and aiming at the cut at A. White will have a hard time defending both of her groups at the top. You should note that White has still not secured the territory at the side; Black can still pull his stone out by playing at B. <= ]
)
(;B[me]
C[How the game continued.  

Black pressed White against the top ... ]
;W[ld];B[le];W[kd];B[ke]
C[... with the sequence to 5. In some positions, these might be good moves, but in this case Black lost his chance to score a decisive win. ]
;W[jc]
C[White secured all her stones at the top and made some territory there as well. ]
;B[qj]
C[If Black had made an iron pillar with 7, however, this would be a satisfactory result. See Problem 29 for the continuation. <= ]
)
)