(;GM[1]FF[4]SZ[19]
GN[Problem 2]
PC[http://senseis.xmp.net/?DoubleSnapback/attempts2]AP[GoWiki:2009]
DT[2011-11-30]
C[Diagram from http://senseis.xmp.net/?DoubleSnapback/attempts2

Problem 2]
PL[B]

AB[ap][bp][cp][dp][ep][fp][gp][cq][gq][er][gr][gs]
AW[aq][bq][dq][eq][fq][ar][cr][fr][as][es][fs]
CR[er]
LB[bs:a]

;B[cs]C[B1]MN[1]
;W[br]C[W2]MN[2]
;B[dr]C[B3]MN[3]
;W[ds]C[W4]MN[4]

;CR[er]
LB[bs:a]
)
