ZarankiewiczDB,

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Matrix for z(20,23)

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

Scaffold: $p=5$, $q=4$, $\mathbf{m}=(4,4,3,2,2)$, $\mathbf{n}=(4,4,4,4)$, $m_O = 2$, $n_O = 0$.

(66.394567635 seconds, score = 103, 610048 recursive calls, max depth = 22)

weight = 103, submitted by Andrew Kay on April 22nd, 2016 (link, raw)

Related: Matrix 2080