(;GM[1]FF[4]SZ[19]
GN[White can't connect at B7]
PC[http://senseis.xmp.net/?DoubleSnapback/Attempts6]AP[GoWiki:2009]
DT[2010-06-16]
C[Diagram from http://senseis.xmp.net/?DoubleSnapback/Attempts6

White can't connect at B7]
PL[B]

AB[ao][bo][cp][dp][ep][fp][gp][hp][aq][bq][cq][hq][iq][jq][hr][jr][kr][lr][bs]
AW[an][bn][cn][dn][eo][fo][go][ho][ip][jp][kp][dq][eq][fq][gq][lq][mq][ar][br][cr][gr][ir][mr][hs][is][js][ms]

;B[dr]C[B1]MN[1]
;W[ds]C[W2]MN[2]
;B[er]C[B3]MN[3]
;W[fr]C[W4]MN[4]
;B[ks]C[B5]MN[5]
;W[es]C[W6]MN[6]
;B[gs]C[B7]MN[7]

;
)
