ZarankiewiczDB,

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Matrix for z(8,20)

11111
11111
11111
11111
11111
11111
1111111
1111111

Found by the scaffold algorithm.

(0.032799978 seconds, score = 44, 102 recursive calls, max depth = 22)

lower bound = 44, submitted by Andrew Kay on April 22nd, 2016 (link, raw)