ZarankiewiczDB,

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Matrix for z(21,23)

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

Found by the scaffold algorithm. Compare with Matrix 31.

(5.771960123 seconds, score = 108, 30589 recursive calls, max depth = 22)

lower bound = 108, submitted by Andrew Kay on April 23rd, 2016 (link, raw)