(;GM[1]FF[4]SZ[19]
GN[Possibly reply for W - fails]
PC[http://senseis.xmp.net/?GokyoShumyoSection2Problem21/Attempts]AP[GoWiki:2009]
DT[2010-02-04]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection2Problem21/Attempts

Possibly reply for W - fails]
PL[W]

AB[ba][gb][dc][gc][bd][cd][dd][ed][fd][bf]
AW[db][eb][bc][cc][ec][ad]

;W[bb]C[W1]MN[1]
;B[ca]C[B2]MN[2]
;W[aa]C[W3]MN[3]
;B[ac]C[B4]MN[4]

;
)
