(;
GM[1]
SZ[19]
AW[qf][ql][ol]
AB[pj][dj][dp][pd][pp][dd][nd][qn]
LB[qf:1][nd:2][ql:3][qn:4][ol:5]
C[Problem 41. Black to play.  

How should Black continue after White jumps to 5 ? ]
(;B[qk]
TE[2]
C[Correct Answer.  

Black should first exchange 1 for ... ]
;W[rl]
C[... White 2, ... ]
;B[on]
LB[pl:A]
C[... then jump to 3, threatening to wedge in at A and take territory on the side. ]
;W[om]
C[White must defend by exchanging 4 ... ]
;B[nn]
C[... for Black 5. ]
;W[nk]
C[She then runs away into the center by taking the vital point of 6, but ... ]
;B[oi]
C[... Black follows her with 7. White's stones below are on the run, so she hasn't time to think about her lone stone above. <= ]
)
(;B[qe]
C[Variation.  

Black might also exchange 1 ... ]
;W[pf]
C[... for White 2, ... ]
;B[nj]
C[... then jump to 3. ]
;W[rj]
C[Since this move let's White slide to 4, it is a bit slack, but ... ]
;B[ml]
LB[qi:B][rh:A][rf:C]
C[... Black can play for central influence with 5. Later, Black can attack the white stones by playing at A. If White B, Black links up at C. <= ]
)
(;B[jc]
C[How the game continued.  

Black switched to the top, taking a big point at 1. The situation on the right remained fluid, but Black had certainly not fallen behind; he only lost a chance to take a decisive lead. ]
;W[fq];B[fp];W[gp];B[fo];W[eq]
C[This pause allowed White establish a position in the lower left. ]
;B[dq];W[or]
C[She then switched to the lower right with 8. The game was becoming complicated. See Problem 45 for the continuation. <= ]
)
)