(;GM[1]FF[4]SZ[9]
GN[]
PC[http://senseis.xmp.net/?TheArtOf9x9Go/yokoyama111]AP[GoWiki:2009]
DT[2016-10-21]
C[Diagram from http://senseis.xmp.net/?TheArtOf9x9Go/yokoyama111

]
PL[W]

AB[cb][fc][hc][ee][cf][df][ff][cg][fg][gg]
AW[eb][gc][hd][dg][eg][hg][fh][gh][hh]
LB[fd:a]

;W[gb]C[W20]MN[20]
;B[fb]C[B21]MN[21]

;LB[fd:a]
)
