(;GM[1]FF[4]SZ[19]
GN[Book solution is better]
PC[http://senseis.xmp.net/?BQM272]AP[GoWiki:2009]
DT[2010-07-08]
C[Diagram from http://senseis.xmp.net/?BQM272

Book solution is better]
PL[B]

AB[ea][cb][eb][bc][cc][ec][dd][ed]
AW[fa][bb][fb][ac][fc][bd][cd][fd][de][ee][fe][cf]
CR[aa][ad]

;B[ca]C[B1]MN[1]
;W[ab]C[W2]MN[2]
;B[db]C[B3]MN[3]
;W[ba]C[W4]MN[4]

;CR[aa][ad]
)
