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

Overconcentration]
PL[W]

AB[dd]
AW[cf]
LB[cc:a][fd:c][df:b]

;W[fc]C[W1]MN[1]
;B[hc]C[B2]MN[2]
;W[ee]C[W3]MN[3]

;LB[cc:a][fd:c][df:b]
)
