(;GM[1]FF[4]SZ[19]
GN[Black plays 'a']
PC[http://senseis.xmp.net/?BQM2]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM2

Black plays 'a']
PL[B]

AB[ba][da][ga][gb][fc][gc][bd][cd][dd][ed]
AW[aa][fa][db][eb][fb][ac][bc]

;B[ca]C[B1]MN[1]
;W[cc]C[W2]MN[2]
;B[cb]C[B3]MN[3]
;W[bb]C[W4]MN[4]

;
)
