(;FF[4]GM[1]SZ[19]CA[UTF-8]AP[SGFC:1.16]

GN[Black to play. Can he save his marked stone?]
DT[2009-04-22]
PC[http://senseis.xmp.net/?LongestLadderProblem]

AB[ab:ac][ap][ar:as][bn:cn][cp][dc:ec][ds][eo:ep][fe:ge][ho:io]
[je:ke][kh:ki][km:kn][lk:mk][mm][mo:no][of:og][oj:ok][oq:pq]
[qa:ra][qd:qe][sq:sr]AW[ao:bo][aq:bq][br][do:dp]SQ[ap]PL[W]
;SQ[ap])
