ZarankiewiczDB,

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Matrix for z(19,23)

11
11
11111
11111
11111
111
11111
11111
1111
1111
11111
11111
1111
1111
11111
11111
1111
1111
1111
1111
1111
11111
11111

Scaffold: $p=4$, $q=4$, $\mathbf{m} = (4,4,4,4)$, $\mathbf{n} = (4,3,3,3)$, $m_O=2$, $n_O=1$.

(31825.910431913 seconds, score = 98, 139661386 recursive calls, max depth = 26)

weight = 98, submitted by Andrew Kay on April 22nd, 2016 (link, raw)