ZarankiewiczDB,

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z(13,23) = 71

111111
11111
111111
11111
111111
11111
111111
11111
11111
11111
11111
111111
111111

Scaffold: $p=5$, $q=2$, $\mathbf{m} = (2,2,2,2,2)$, $\mathbf{n} = (5,4)$, $m_O=0$, $n_O=8$.

(82.302649064 seconds, score = 71, 1140061 recursive calls, max depth = 35)

weight = 71, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

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