(;
AB[ob][pb][lc][mc][qd][qe][qf][mf][of]
AW[qb][qc][oc][od][rd][re][rf]
PL[W]
C[White plays.

Source:
    The Endgame, Chap. 5, p. 105
    Tomoko Ogawa & James Davies, Ishi Press]
(;
W[pc]
C[The obvious move is simply to connect, which is also forcing.]
(;
B[nb]
LB[qa:A]
C[Black will protect here, after which the sente play at A to reduce White's corner is Black's privilege.

This result is not satisfactory for White.]
)
    (;
    B[nc]
    C[Trying to make more territory here is a mistake.];
    W[pa]
    C[White is happy to hane in sente here.  Now Black has lost the sente hane to reduce White's corner.]
    )
)
    (;
    W[nb]
    C[Sacrificing a stone here is the tesuji.];
    B[nc];W[pc]
    C[Now when White connects, ...];
    B[mb]
    LB[qa:A]
    C[... Black can no longer hane at A to reduce White's corner.

Also note that Black's territory is one point less:  Black captures a stone, but has to spend 2 moves to complete the capture.]
    )
)

