ZarankiewiczDB,

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Matrix for z(13,28)

1111111
1111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
111111
1111111

Found by the scaffold algorithm.

(226.489741573 seconds, score = 81, 1178257 recursive calls, max depth = 44)

lower bound = 81, submitted by Andrew Kay on April 23rd, 2016 (link, raw)