(;AW[sq][rq][rr][sr][qs][ps][pr][oq]AB[qr][qq][qp][rp][sp][rs]LB[ss:a]GC["Mathematics of Go Game" by SHIMADA Takuya, publ. 1958 by Maki Shoten. Chapt. 6, p 107, Dia. 14]N["Mathematics of Go Game" by SHIMADA Takuya, publ. 1958 by Maki Shoten. Chapt. 6, p 107, Dia. 14])