(;GM[1]FF[4]SZ[4:2]
GN[Black forces a two-eye-formation]
PC[http://senseis.xmp.net/?TwoEyeFormation]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TwoEyeFormation

Black forces a two-eye-formation]
PL[B]

AB[ba][ab][bb][cb][db]

;B[da]C[B1]MN[1]

;
)
