ZarankiewiczDB,

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Matrix for z(16,23)

111111
111111
111111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
1111111

Found by the scaffold algorithm.

(36.121992041 seconds, score = 85, 243694 recursive calls, max depth = 33)

lower bound = 85, submitted by Andrew Kay on April 23rd, 2016 (link, raw)