(;
GM[1]FF[4]VW[]AP[Many Faces of Go:11.0]
SZ[19]
HA[0]
ST[1]
DT[2003-03-19]
KM[0.0]
RU[Japanese]
AB[ob][pc][pd][qd][mc][ld]
AW[oc][nd][oe][pe][qe][qj]
PL[W]
(;W[pb]
(;B[qb]
C[CHOICE]
;W[nb];B[nc];W[oa];B[od];W[rd]
C[RIGHT
Black not only loses sente, but he has to fight the ko at A too.
If black connects at B, white can go C or D. White succeeds.]
LB[me:D][rb:C][qc:B][ob:A]
)
(;B[nb]
C[CHOICE]
;W[rd];B[rc];W[re]
C[RIGHT
This is sente for white because of A.]
LB[qb:A]
))
(;W[nb];B[nc]
(;W[od];B[pb]
C[Although white seems to retain sente, this is not so. Rather,
white has helped black to strenghten his territory at the corner
instead. What was supposedly white's sente at A has become diminished
because of black's sente at B.]
LB[rd:B][kc:A]
)
(;W[pb];B[od]
C[Black group connects. White fails.]
)
(;W[oa];B[pb]))
(;W[nc];B[nb])
(;W[rd];B[rc];W[pb];B[qb];W[nb];B[pa]
C[White loses sente.]
LB[nc:A]
)
(;W[rc];B[rd]))