(;GM[1]FF[4]SZ[19]
GN[Shirakawa-sensei's lecture]
PC[http://senseis.xmp.net/?HikaruProblem9]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?HikaruProblem9

Shirakawa-sensei's lecture]
PL[B]

AB[qo][ro][qp][nq][oq][qq][nr][rr]
AW[rp][rq][or][pr][qr][sr]

;B[rs]C[B1]MN[1]

;
)
