(;GM[1]FF[4]SZ[19]
GN[How many moves for Black?]
PC[http://senseis.xmp.net/?ConstructionProblem6]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ConstructionProblem6

How many moves for Black?]
PL[B]

AB[ia][ib][ac][ic][ad][id][ae][ie][af][bf][cf][df][ef][ff][gf][hf]
AW[ba][ha][ab][bb][hb][bc][hc][bd][hd][be][ce][de][ee][fe][ge][he]

;B[ec]C[B1]MN[1]
;B[ea]C[B3]MN[3]
;B[db]C[B5]MN[5]
;B[fb]C[B7]MN[7]

;
)
