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

Real overconcentration]
PL[B]

AB[eb][dc][ec][hc][dd][de]
AW[cb][db][cc][fc][cd][cf]
CR[hc]
SQ[jc][id][jd]
LB[df:c][eg:a][ch:b]

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

;CR[hc]
SQ[jc][id][jd]
LB[df:c][eg:a][ch:b]
)
