ZarankiewiczDB,

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z(6,9) = 21

111
111
111
11
11
11
11
11
11

Found by the general algorithm.

(0.09798927 seconds, score = 21, 96 recursive calls, max depth = 20)

lower bound = 21, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

By Roman's bound with $p = 2$. [Rom75]

upper bound = 21, submitted on April 22nd, 2016 (link)

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