(;GM[1]FF[4]SZ[19]
GN[A big ko both sides avoid]
PC[http://senseis.xmp.net/?PGB241]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?PGB241

A big ko both sides avoid]
PL[B]

AB[ga][bb][gb][jb][kb][nb][ob][rb][bc][cc][fc][hc][ic][mc][pc][qc][sc][ad][cd][fd][gd][id][md][nd][od][rd][sd][be][de][ee][ge][ie][se][bf][ef][gf][hf][lf][mf][nf][sf][eg][fg][kg][og]
AW[ba][ca][ea][fa][la][na][ab][cb][db][fb][ib][mb][dc][ec][jc][kc][lc][nc][dd][jd][ld][qd][ce][he][je][ke][qe][re][af][cf][ff][if][kf][pf][rf][bg][cg][gg][hg][jg][lg][pg][rg][sg]
LB[ia:a]

;B[lb]C[B1]MN[1]
;W[ja]C[W2]MN[2]

;LB[ia:a]
)
