(;GM[1]FF[4]SZ[19]
GN[Stone efficiency]
PC[http://senseis.xmp.net/?AboutTheOpening]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?AboutTheOpening

Stone efficiency]
PL[B]

AB[hq][kq]
AW[ij][kj][qp][oq]
CR[qq][rq][sq][ir][jr][pr][qr][rr][sr][is][js][ps][qs][rs][ss]


;CR[qq][rq][sq][ir][jr][pr][qr][rr][sr][is][js][ps][qs][rs][ss]
)
