ZarankiewiczDB,

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Matrix for z(9,28)

11111111
111111
111111
111111
111111
111111
111111
11111111
11111111

Found by the scaffold algorithm.

(0.056751346 seconds, score = 60, 191 recursive calls, max depth = 34)

lower bound = 60, submitted by Andrew Kay on April 22nd, 2016 (link, raw)