(;GM[1]FF[4]SZ[19]
GN[Black can connect, but what is the best continuation now? Ko at ''a''?]
PC[http://senseis.xmp.net/?TsumegoFromGames109/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames109/Attempts

Black can connect, but what is the best continuation now? Ko at ''a''?]
PL[B]

AB[ga][hb][hc][ic][id][ge][ie][if][hg][ig]
AW[fb][gb][dc][gc][hd][he][cf][hf][gg][gh]
CR[ga]
LB[cb:a]

;B[eb]C[B1]MN[1]
;W[ec]C[W2]MN[2]
;B[fa]C[B3]MN[3]
;W[gd]C[W4]MN[4]

;CR[ga]
LB[cb:a]
)
