ZarankiewiczDB,

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Matrix for z(21,24)

11
11
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
111
111
11111
11111
11111
11111

Compare with Matrix 31.

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

(135.594538166 seconds, score = 110, 748330 recursive calls, max depth = 22)

weight = 110, submitted by Andrew Kay on April 22nd, 2016 (link, raw)