(;GM[1]FF[4]SZ[19]
GN[How can white survive after black plays ko?]
PC[http://senseis.xmp.net/?Colinta]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Colinta

How can white survive after black plays ko?]
PL[B]

AB[gq][hq][iq][jq][kq][lq][mq][nq][gr][nr][or][fs][ks][os]
AW[er][fr][hr][ir][jr][kr][lr][mr][pr][is][ms][ns]

;B[hs]C[B1]MN[1]
;B[gs]C[B3]MN[3]

;
)
