(;GM[1]FF[4]SZ[19]
GN[One liberty]
PC[http://senseis.xmp.net/?RTGProblem49a/Solution]AP[GoWiki:2009]
DT[2012-12-12]
C[Diagram from http://senseis.xmp.net/?RTGProblem49a/Solution

One liberty]
PL[W]

AB[ba][bb][fb][bc][cc][dc][ec][fc][gc][hc][ic]
AW[da][fa][ha][cb][db][eb][gb][hb][ib][jc][bd][cd][dd][ed][fd][gd][id][jd]
CR[hd]

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

;CR[hd]
)
