(;GM[1]FF[4]SZ[19]
GN[Challenge]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem255/Attempts]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem255/Attempts

Challenge]
PL[W]

AB[qh][ri][oj][pj][qj][ok][ol][rl][om][rm][on][rn][lo][mo][no][oo][lp][op][rp][lq][lr][pr][qr][ms]
AW[rj][pk][qk][rk][pl][pm][pn][po][mp][np][pp][mq][oq][pq][mr][nr][or]

;W[rq]C[W1]MN[1]
;B[rr]C[B2]MN[2]
;W[qq]C[W3]MN[3]
;B[sq]C[B4]MN[4]

;
)
