(;GM[1]FF[4]SZ[19]
GN[How did it happen? (1)]
PC[http://senseis.xmp.net/?BQM226]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM226

How did it happen? (1)]
PL[W]

AB[pd][pl][on][po][dp]
AW[qm][np][pq]
LB[qo:a][qp:b]

;W[ql]C[W1]MN[1]
;B[pk]C[B2]MN[2]
;W[qk]C[W3]MN[3]
;B[qj]C[B4]MN[4]
;W[rj]C[W5]MN[5]
;B[qi]C[B6]MN[6]
;W[ri]C[W7]MN[7]
;B[qh]C[B8]MN[8]
;W[pm]C[W9]MN[9]
;B[om]C[B10]MN[10]

;LB[qo:a][qp:b]
)
