(;
AB[nb][nc][mc][oc][hd][pd][qd][ce][me][re][ef][eg][eh][nf][pf][qf][dh][cn][jp][dq]
AW[ob][pb][bc][dc][pc][qc][rc][ed][md][od][oe][rd][dg][ch][di][cj][qj][qp][oq]
PL[W]
TR[me]
C[White's response to the marked clamp?

Source:
    Rin Kaiho 9P (Black) v. Cho Chikun 9P
    American Go Journal, v36 #3, pp. 41-42
    Originally appeared in "Weiqi World" magazine, Oct. 2001.]
(;
W[nd]
C[Can White even play here?!];
B[ld]
C[Of course, Black is going to block here, but ...];
W[le]
C[... every go player should at least be able to think about this cut.];
B[kd];W[mf];B[of];W[ne];B[pe];W[me];B[mg];W[ke];B[jd];W[lg];B[mh];W[lh];B[li]
C[White has run out, but this result is not so good for White.

White has bad shape, while Black can continue the attack without cutting points to worry about.

The variation to White's 1st move shows Cho Chikun's ingenious move from the game.]
)
    (;
    W[jc]
    TR[ef][eg][eh][dh]
    C[Cho's ingenious game move, which few players might see!

This move creates a problem for the marked group.]
    (;
    B[ld]
    C[If Black captures the 3 stones, ...];
    W[hc]
    C[... White's attachment will erase Black's top territory.]
    )
        (;
        B[fc]
        C[Because of the previous variation, Rin defended here in the game.];
        W[nd]
        C[Now Cho comes back here to connect.]
        (;
        B[ld]
        C[If Black cuts now, ...];
        W[lc]
        C[... White can cut on the other side with a good result.];
        B[lb];W[kc];B[of];W[na];B[mb];W[le]
        C[Now White has this instructive squeeze.];
        B[kd];W[ke];B[jd];W[id];B[je];W[ie];B[jf];W[hc]
        C[White benefits enormously by sacrificing the stones to the right.]
        )
            (;
            B[kc]
            C[The actual game follows.];
            W[ld];B[kd];W[le];B[mg];W[lg];B[lh];W[mh]
            C[The result is a complicated unclear fight.

A few more game moves follow.];
            B[nh];W[mi];B[jd];W[kg];B[ni];W[mj];B[kh];W[jh];B[ki]
            C[And the game continues until move 233 with a close result, but with Black finally winning.]
            )
        )
    )
)

