ZarankiewiczDB,

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Matrix for z(23,23)

11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111

Found by the scaffold algorithm.

(5.31517637 seconds, score = 115, 22072 recursive calls, max depth = 33)

lower bound = 115, submitted by Andrew Kay on April 23rd, 2016 (link, raw)