(;GM[1]FF[4]SZ[19]
GN[local ko threats]
PC[http://senseis.xmp.net/?GokyoShumyoSection6Problem4/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection6Problem4/Attempts

local ko threats]
PL[W]

AB[da][fa][eb][dc][ec][fc][gc][jc][kc][fd][ee][fe][he][ie][fg]
AW[ga][cb][db][fb][gb][ib][cc][hc][cd][ed][hd][de][df][ff][eg]
LB[ca:b]

;W[ge]C[W1]MN[1]
;B[gf]C[B2]MN[2]
;W[gd]C[W3]MN[3]
;B[ef]C[B4]MN[4]

;LB[ca:b]
)
