(;GM[1]FF[4]SZ[6]
GN[mathpuzzle optimal play 21-30 B27 at B24]
PC[http://senseis.xmp.net/?6x6]AP[GoWiki:2009]
DT[2009-08-02]
C[Diagram from http://senseis.xmp.net/?6x6

mathpuzzle optimal play 21-30 B27 at B24]
PL[B]

AB[ab][bc][dc][bd][dd][ed][fd][be][de][cf]
AW[ea][bb][cb][db][cc][ec][fc][cd][ce][ef]

;B[df]C[B21]MN[21]
;W[ac]C[W22]MN[22]
;B[ad]C[B23]MN[23]
;W[bf]C[W24]MN[24]
;B[af]C[B25]MN[25]
;W[fe]C[W26]MN[26]
;B[bf]C[B27]MN[27]
;W[ba]C[W28]MN[28]
;B[ee]C[B29]MN[29]
;W[aa]C[W30]MN[30]

;
)
