(;
AB[pl][pm][qn][qq][op][oo][np][mq][kq][pc][pd][qe][pf][of][qk]
AW[qf][qg][pg][og][nf][nc][pk][ok][ql][qp][pp][pq][no][nr][mr]
PL[W]
TR[qk]
C[White's response to the marked play?

Source:
    American Go Journal, Vol. 30, No. 2, p. 15];
W[qj];B[rk];W[rl]
LB[rj:A]
C[Assume, for the sake of this problem, that White blocks on this side instead of defending at A.]
(;
B[rj]
C[What should White do if Black tries to immediately force the issue here on the side?];
W[ri]
C[A standard squeeze, but the surrounding stones are often important for how the sequence plays out.];
B[qi];W[sj];B[pj];W[sk];B[qj]
(;
W[qh]
C[The wrong direction.];
B[oj];W[nk]
C[Now at best, the situation has become needlessly complicated for White.]
)
    (;
    W[oj]
    C[Correct, but ...];
    B[rh]
    C[... Black seems to have an advantage in the semeai.];
    W[qh]
    C[An odd-looking, but useful move to continue the squeeze.];
    B[si];W[sl]
    C[White wins the semeai by one move.];
    B[rg]
    C[For example, if Black persists ...];
    W[rf]
    C[... Black loses all the side stones.]
    )
)
    (;
    B[nl]
    C[Black should leave the 2 right side stones for later aji.  For example, by playing here, Black builds center thickness, while indirectly aiming to use the aji of the 2 side stones later.]
    )
)

