(;GM[1]
FF[4]
AP[Hibiscus:2.1]
SZ[19]
ST[3]
SO[Old Chinese tsume-go book]
US[Merlijn Kuin]
GC[Difficulty: 100/100]
;C[One of the most difficult to find,
as well as one of the most
beautiful tesuji I've ever seen:
Somehow black has to save both
his groups.]
N[Problem 1]
AB[dd][eb][fd][fe][gf][ha][hb][hc][hd][hf][ic][ie][jb][je][kd][ke][ld][lf][me][od][pc]
AW[gb][gc][gd][ge][he][ib][id][if][jc][jd][jf][kc][kf][lc][mc][mf][nc][nf][ob]
;B[nb]
C[O.k. now you know this move, but
how should white answer it?]
N[Problem 2]
(;W[na]
LB[na:2][ne:A][lg:B][ga:C][na:2][nd:D]C[The correct move.]
(;B[ga]
;W[md]
;B[le]
;W[lg]
;B[ne]
;W[oe]
;B[nd]
;W[pd]
;B[oc]
;W[qc]
;B[pb]
;W[pa]
C[White is trapped in ko.
Very nice isn´t it. RIGHT]
)(;B[nd]
;W[ja]
C[Black is captured.]
)(;B[ne]
;W[ja]
C[Black is captured.]
)(;B[lg]
;W[ja]
C[Black is captured.]
))(;W[oc]
;B[ne]
;W[ga]
;B[ia]
;W[ka]
;B[kb]
;W[la]
;B[lb]
;W[ma]
;B[mb]
;W[na]
;B[fc]
)(;W[mb]
;B[ga]
;W[md]
;B[le]
;W[lg]
;B[ne]
;W[oe]
;B[nd]
;W[pd]
;B[oc]
;W[qc]
;B[pb]
)(;W[oa]
C[A tricky response: black has to
be on his guard.
Any idea for the next move?]
N[Problem 3]
(;B[na]
C[Tesuji number 3.]
;W[ka]
;B[kb]
;W[la]
;B[lb]
;W[ma]
;B[ga]
)(;B[oc]
C[Looks nice but white has a
counter:]
;W[ja]
;B[ia]
C[If black extends white captures
him in a snap-back.]
;W[ka]
C[black is dead.]
)))