ZarankiewiczDB,

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Matrix for z(10,21)

111111
11111
11111
11111
11111
11111
11111
111111
111111
111111

Found by the scaffold algorithm.

(0.033987839 seconds, score = 54, 91 recursive calls, max depth = 25)

lower bound = 54, submitted by Andrew Kay on April 22nd, 2016 (link, raw)