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

Avoid overconcentration?]
PL[B]

AB[gc][gd][ge][gf]
AW[hc][hd][pd][he][hf]
LB[lc:a]

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

;LB[lc:a]
)
