(;GM[1]FF[4]SZ[19]
GN[When White must play lightly]
PC[http://senseis.xmp.net/?HeavyVersusOverconcentrated/efficiency]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?HeavyVersusOverconcentrated/efficiency

When White must play lightly]
PL[B]

AB[dd][jd][pd]
AW[fc]
LB[db:b][eb:a]

;B[ec]C[B1]MN[1]
;W[hc]C[W2]MN[2]

;LB[db:b][eb:a]
)
