(;GM[1]FF[4]SZ[19]
GN[Black 1 is a Clamp]
PC[http://senseis.xmp.net/?Clamp]AP[GoWiki:2009]
DT[2012-12-15]
C[Diagram from http://senseis.xmp.net/?Clamp

Black 1 is a Clamp]
PL[B]

AB[nq][or]
AW[pn][pp][pr]
CR[pr]
LB[pq:a][ps:b]

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

;CR[pr]
LB[pq:a][ps:b]
)
