ZarankiewiczDB,

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Matrix for z(10,15)

1111
1111
111
111
111
111
111
111
111
111
111
111
11
11
11

Found by the general algorithm.

(4.735135891 seconds, score = 44, 19418 recursive calls, max depth = 43)

lower bound = 44, submitted by Andrew Kay on April 22nd, 2016 (link, raw)