(;GM[1]FF[4]SZ[19]
GN[Oiotoshi]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem20/Solution]AP[GoWiki:2009]
DT[2014-01-29]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem20/Solution

Oiotoshi]
PL[W]

AB[ab][gb][jb][bc][dc][ec][fc][gc][hc][ic][jc][bd][ed][be][ce][de]
AW[ba][ca][da][ea][ga][ja][bb][cb][db][eb][fb][hb][ib][kb][cc][kc][cd][dd][jd][kd][ee][fe][he]

;W[ka]C[W12]MN[12]
;B[ac]C[B13]MN[13]
;W[ia]C[W14]MN[14]
;B[aa]C[B15]MN[15]

;
)
