(;
AB[qd][oc][pc][pf][pq][jd][lf][ne]
AW[dd][cq][hc][nc][nd][md][od]
TR[lf]
PL[W]
C[White's response to the marked play?

Source:
    Go World #19, p. 37
    Rin Kaiho 9p v. Hashimoto Shoji 9p, (1979 Kisei)]
(;
W[ke]
C[White's obvious reply is to split Black's stones here, but ...];
B[le]
C[... Black has this severe counter sequence.];
W[kd]
TR[ke]
C[And if White tries to save the marked stone, ...];
B[ld];W[lc];B[kc]
C[... Black's cut works.];
W[jc];B[kb];W[je]
C[Otherwise, Black's ladder here works.];
B[lb];W[mc];B[jb];W[ic];B[mb];W[nb];B[oe]
C[Black captures the 7 stones.]
)
    (;
    W[mf]
    C[In the game, Hashimoto played this nice move.  The following sequence is the game line.];
    B[mg]
    C[After Black responded here, ...];
    W[ke]
    C[... White came back here to split Black.]
    (;
    B[nf]
    C[The game continued ...];
    W[me];B[ng]
    LB[kd:A][lg:B]
    C[And now, White can play at A to have the advantage at the top.

In the game, White aggressively cut at B.]
    )
        (;
        B[le]
        C[Black can push here, but ...];
        W[ld];B[kd];W[me]
        (;
        B[lg];W[ng]
        C[White can move out here.]
        )
            (;
            B[ng]
            C[No better.];
            W[je];B[id];W[ie]
            LB[lg:A]
            C[And now White threatens a ladder at A.]
            )
        )
        (;
        B[me]
        C[And if Black pushes in this direction, ...];
        W[kd]
        TR[jd]
        C[... White can block here to weaken the marked stone.]
        )
    )
)

