ZarankiewiczDB,

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Matrix for z(10,23)

111111
111111
111111
111111
11111
11111
11111
111111
111111
111111

Found by the scaffold algorithm.

(0.639386291 seconds, score = 57, 3558 recursive calls, max depth = 28)

lower bound = 57, submitted by Andrew Kay on April 22nd, 2016 (link, raw)