ZarankiewiczDB,

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Matrix for z(12,30)

1111111
1111111
1111111
111111
111111
111111
111111
111111
111111
1111111
1111111
1111111

Found by the scaffold algorithm.

(92.708333601 seconds, score = 78, 448757 recursive calls, max depth = 43)

lower bound = 78, submitted by Andrew Kay on April 22nd, 2016 (link, raw)