(;GM[1]FF[4]SZ[19]
GN[more difficult]
PC[https://senseis.xmp.net/?BQM602]AP[GoWiki:2009]
DT[2021-05-17]
C[Diagram from https://senseis.xmp.net/?BQM602

more difficult]
PL[B]

AB[fb][bc][dc][ec][bd][cd]
AW[ab][bb][cb][db][eb][cc]

;B[ea]C[B9]MN[9]
;W[fc]C[W10]MN[10]
;B[gb]C[B11]MN[11]
;W[gc]C[W12]MN[12]
;B[hc]C[B13]MN[13]
;W[dd]C[W14]MN[14]
;B[ed]C[B15]MN[15]
;W[de]C[W16]MN[16]

;
)
