(;
AB[pp][rp][oq][lq]
AW[jq][on][qn][ro]
C[White plays.

Source:
    From the endgame volume of Gokyo Seimyo, a nearly 200 year old problem set.];
W[rq]
C[The famous clamp tesuji.];
B[sp]
C[Black descends to demand that White prove that the clamp is more than just stylish.];
W[or]
C[An innocent looking contact play, but Black is hard pressed to find a satisfying answer.]
(;
B[nr]
C[If Black tries to take the entire corner, ...];
W[nq]
C[... White unleashes the 2nd tesuji, the cross-cut.]
(;
B[pr]
C[If Black goes after the stone on the 2nd line, ...];
W[mr]
C[... then White forces on the outside.];
B[os];W[mq]
TR[lq]
LB[qp:A]
C[White cuts off the marked stone, and has almost sealed in Black's corner, which, after a later White sente play at A, shrinks to about 11 points.

The result is a big success for White.]
)
    (;
    B[np]
    C[If Black goes after the stone on the left, ...];
    W[pq]
    C[... then White can force on the right.];
    B[op];W[qp]
    C[White destroys Black's corner.]
    )
)
    (;
    B[pr]
    C[Blocking on the inside isn't any better.];
    W[nq]
    C[Similar to the main line.]
    )
    (;
    B[nq]
    C[Black can solidly extend, but ...];
    W[qq]
    C[... White can make life inside Black's corner.]
    )
)

