(;GM[1]FF[4]SZ[19]
GN[W can only make seki (at a), if these are the first two plays]
PC[http://senseis.xmp.net/?posting=3887]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?posting=3887

W can only make seki (at a), if these are the first two plays]
PL[W]

AB[aa][ba][ca][da][ab][db][ac][dc][ad][dd][ae][be][ce][de]
AW[ea][eb][ec][ed][ee][af][bf][cf][df][ef]
LB[bb:a]

;W[bc]C[W1]MN[1]
;W[bd]C[W3]MN[3]
;B[cc]C[B4]MN[4]

;LB[bb:a]
)
