(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem23/Attempts]AP[GoWiki:2009]
DT[2011-05-28]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem23/Attempts

Solution]
PL[B]

AB[db][bc][cc][dc][dd][de][cf][bg][cg]
AW[da][bb][cb][eb][ac][fc][bd][cd][ce][fe][bf][df][ef]

;B[ab]C[B1]MN[1]
;W[aa]C[W2]MN[2]
;B[ca]C[B3]MN[3]
;W[ba]C[W4]MN[4]
;B[ae]C[B5]MN[5]
;W[ad]C[W6]MN[6]
;B[af]C[B7]MN[7]

;
)
