(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[http://senseis.xmp.net/?Imagist/Problem4Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Imagist/Problem4Solution

Black to play]
PL[B]

AB[ba][ea][bb][eb][fb][cc][dc][dd]
AW[ga][cb][db][gb][bc][ec][fc][gc][bd][ce][df][ef]
CR[eb]

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

;CR[eb]
)
