(;
AB[qo][pp][np][lp][jq][qj]
AW[co][dq][hq][pn][qn][nn]
LB[om:A]
C[Black to play against the lower right side group.  Should Black peep at A?

Source:
    Go World #18, p. 58
    "Forcing Moves"
    Sakai Masanori 4P and James Davies]
(;
B[om]
C[Peeping is a mistake.];
W[on]
C[White connects and seems to have a heavy group, but Black now has a weakness.];
B[ro]
C[Even if Black plans to continue with this descent, ...];
W[oq]
C[... White can cause trouble in the corner.]
(;
B[op]
TR[on]
C[With the marked stone, Black must block here.];
W[lr];B[kq];W[pq]
C[This result is not trouble that Black wants.]
)
    (;
    B[pq]
    AE[on]
    LB[on:A]
    C[Note that without White's stone at A, Black can block here instead to prevent the destruction of the lower territory.]
    )
)
    (;
    B[oj]
    C[If Black wants to attack, this calm jump is probably right.]
    )
)

