(;GM[1]FF[4]SZ[19]
GN[negative value exchange]
PC[http://senseis.xmp.net/?BQM213]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM213

negative value exchange]
PL[B]

AB[oc][qd][qj][bl][bm][pn][co][cp][pp][cq][cr]
AW[dd][bj][dj][cm][dn][do][dp][dq][jq][nq][dr]
LB[ko:a][mo:b][mp:c][qq:d]

;B[lq]C[B1]MN[1]
;W[jo]C[W2]MN[2]

;LB[ko:a][mo:b][mp:c][qq:d]
)
