(;GM[1]FF[4]SZ[19]
GN[[Efficient\] versus [inefficient\] walls]
PC[http://senseis.xmp.net/?DefectInAWall]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DefectInAWall

[Efficient\] versus [inefficient\] walls]
PL[B]

AB[db][ob][pb][dc][oc][dd][od][pd][de][pe][df][of]
AW[cb][qb][cc][pc][qc][cd][qd][ce][qe][cf][pf][qf]
CR[db][dc][dd][de][df]
SQ[ob][pb][oc][pc][od][pd][pe][of][pf]
LB[ne:b][oe:a][og:c]


;CR[db][dc][dd][de][df]
SQ[ob][pb][oc][pc][od][pd][pe][of][pf]
LB[ne:b][oe:a][og:c]
)
