ZarankiewiczDB,

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Matrix for z(11,18)

11111
11111
11111
11111
11111
1111
11111
1111
11111
11111
11111

Found by the scaffold algorithm.

(0.149492464 seconds, score = 53, 979 recursive calls, max depth = 22)

lower bound = 53, submitted by Andrew Kay on April 22nd, 2016 (link, raw)