(;GM[1]FF[4]SZ[19]
GN[Discussion.]
PC[http://senseis.xmp.net/?BeginnerExercise140/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise140/Solution

Discussion.]
PL[B]

AB[cb][db][bc][dc][dd][ce][de][df]
AW[bb][cc][bd][cd][be][cf][cg][ch]
LB[bf:a]

;B[ba]C[B1]MN[1]
;W[ab]C[W2]MN[2]

;LB[bf:a]
)
