W can't play N12 if B has more than one external-lib since B will live
unconditionally, as the attached example shows.
I see.
But I'm thinking about this case.
I think W has to play J8, and B starts ko.
Aya never play J8 in playout, and B always wins.
(;GM[1]SZ[9]
KM[7.0]RU[Chinese]
AB[fa][db][fb][hb][dc][fc][gc][hc][ic][dd][de][df][ef][ff][gf][hf][if]
AW[ea][ga][ha][ia][eb][ec][ed][fd][gd][hd][id][ag][bg][cg][dg][dh][di]
;B[da])
Hiroshi Yamashita
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