(;GM[1]FF[4]SZ[19]
GN[what explains this unusual sequence?]
PC[http://senseis.xmp.net/?MarkWirdnam]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?MarkWirdnam

what explains this unusual sequence?]
PL[B]

AB[nb][ob][pb][fc][kc][nc][ld][nd][qd][me][oe][qe][of][qf][lg][og][pq]
AW[kb][lb][mb][mc][oc][pc][qc][rc][dd][md][od][pd][ne][nf][mg][pg][dp]

;B[do]C[B1]MN[1]
;W[ep]C[W2]MN[2]
;B[cp]C[B3]MN[3]
;W[cq]C[W4]MN[4]
;B[co]C[B5]MN[5]
;W[bq]C[W6]MN[6]
;B[er]C[B7]MN[7]
;W[eo]C[W8]MN[8]
;B[en]C[B9]MN[9]
;W[fn]C[W10]MN[10]

;
)
