(;GM[1]FF[4]SZ[19]
GN[best exchange for both?]
PC[http://senseis.xmp.net/?L2Group/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?L2Group/Discussion

best exchange for both?]
PL[B]

AB[ba][da][ea][eb][gb][mb][ob][dc][ec][oc][pc][dd][pd][ae][ce][ee][oe][qe][af][bf][cf][qf][rf]
AW[ca][ab][bb][cb][db][pb][qb][cc][qc][ad][bd][cd][qd][rd][be][re]
CR[gb][mb]
LB[oa:a][sd:b][sf:c]

;B[pa]C[B1]MN[1]
;W[sb]C[W2]MN[2]
;B[ra]C[B3]MN[3]
;W[qa]C[W4]MN[4]
;B[se]C[B5]MN[5]
;W[rb]C[W6]MN[6]

;CR[gb][mb]
LB[oa:a][sd:b][sf:c]
)
