ZarankiewiczDB,

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Matrix for z(6,13)

111
11
11
11
11
11
11
11
11
11
11
11
11

Found by the general algorithm.

(0.061160846 seconds, score = 27, 200 recursive calls, max depth = 26)

lower bound = 27, submitted by Andrew Kay on April 22nd, 2016 (link, raw)