(;GM[1]FF[4]SZ[19]
GN[Under the stones]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem251/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem251/Solution

Under the stones]
PL[B]

AB[an][bn][cn][dn][do][go][ho][jo][ap][dp][ep][fp][aq][bq][cq][dq][iq][jq][lq][ar][kr][as][js]
AW[ck][bl][dl][em][gm][bo][eo][fo][gp][eq][fq][gq][hq][br][cr][dr][gr][hr][ir][bs][cs][fs][hs][is]

;B[er]C[B21]MN[21]

;
)
