(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?DoorGroupExercise1/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DoorGroupExercise1/Solution

Solution]
PL[B]

AB[bg][cg][dg][dh][di][cj][dj][bk]
AW[bf][cf][df][eg][eh][ei][ej][ck][dk][bl][cm]

;B[ak]C[B1]MN[1]
;W[bi]C[W2]MN[2]
;B[bj]C[B3]MN[3]
;W[bh]C[W4]MN[4]
;B[ag]C[B5]MN[5]
;W[ah]C[W6]MN[6]
;B[ai]C[B7]MN[7]
;W[aj]C[W8]MN[8]

;
)
