ZarankiewiczDB,

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Matrix for z(10,19)

11111
11111
11111
11111
11111
11111
11111
11111
11111
111111

Found by the scaffold algorithm.

(0.368909177 seconds, score = 51, 2185 recursive calls, max depth = 23)

lower bound = 51, submitted by Andrew Kay on April 22nd, 2016 (link, raw)