(;
AB[bb][bc][db][dc][ec][fc][gc][jc][jd][cd][id][kd][md][be][he][hf][hg][re][ff][fg][qf][cg][ch][dg][dh][di][dj][qi][ej][ek][hj][ik][il][rk][fl][fm][hl][dm][em][en][eo][ho][ko][kp][kq][dp][eq][jq][nq][pr]
AW[cb][cc][gb][hc][hd][ic][lc][mc][pc][dd][ed][fd][gd][rd][de][ge][pe][qe][bf][bg][bh][cf][ci][cj][ei][fj][fk][dk][dl][hk][qk][ql][cl][cm][el][gl][hm][hn][bn][dn][jn][jo][jp][qn][co][go][pp][hq][iq][qq]
C[With the marked play, White lives with the lower left group.  The game is now very close.

Where should Black play now?

Source:
    American Go Yearbook 2004, pp. 25-6
    "2004 N. Amer. Amateur Ing Cup
    Black:  Joey Hung 7d
    White:  Jie Li 7d
    Commentary:  Jie Li 7d]
TR[iq]
(;
B[mf]
C[Black should have played this key point to seal off territory in the center.]
)
    (;
    B[ng]
    C[In the game, Black plays here, which is the losing move.  The following moves from the game show why.];
    W[mf]
    C[White takes the key point.];
    B[ld];W[nf];B[of];W[oe];B[ne];W[mi]
    C[Now White has this good move.

White has the option of either connecting back to the marked stones, or cutting at A to capture the 4 right side stones.]
    TR[mf][nf]
    LB[pf:]
    (;
    B[oi]
    C[In the game, Black tries to both support the right side and pressure the center stones.];
    W[og];B[pf];W[nh]
    C[White captures the cutting stone.

The following sequence is from the game.];
    B[qj];W[rf];B[rg];W[se];B[ph];W[mk];B[lh];W[li];B[kh];W[mg];B[ok]
    C[And the following is a highly instructive tesuji sequence for connecting White's center stones with the lower center stones.];
    W[jl];B[jm];W[km];B[im];W[kn];B[ll];W[kl];B[lk];W[kj];B[kk];W[jk];B[jj];W[mm]
    C[Captures the 3 stones.]
    )
        (;
        B[mg]
        C[Capturing the 2 stones is small.];
        W[pf];B[og];W[pg];B[oi];W[ph];B[ni];W[pi]
        C[This exchange sequence is very favorable to White.]
        )
    )
)

