Moschopulus wrote:This grid

937856241562194387481273569823647915615932478749581623378469152196725834254318796

we know has a 19 but no 18. Searching for a 19 or a 20 in here might be a good test. A 21 is found immediately.

Just for a reference: Maybe it's interesting to compare the running times to a simple random approach, which needed roughly 500000 'solver-calls' (and 20 'manual' input preparations) to find the first 19. Further search found 100+ different 19s (accompanied by 6000+ 20s).

The 100 first found 19s for this grid:

937856241562194387481273569823647915615932478749581623378469152196725834254318796

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000000001000090300080200000000007005600000470009081000370400000100000000000000096

000000001000090300080200000000007900000000470009081000370400000100000000000010096

000000001000090300080200000000007900000000470009081000370400000100000000000300096

000000001000090300080200000000007900000030470009081000370400000100000000000000096

000000001000090300080200000000607005000000470009081000370400000100000000000000096

000000001000090300080200009000007000000000470009081000370400000100000000000010096

000000001000090300080200009000007000000000470009081000370400000100000000000300096

000000001000090300080200009000007000000030470009081000370400000100000000000000096

000000001000090300080270000000000005000000470009081000370400000100000800000000096

....

[Edit: The post was too long... it's enough to list a few...]

....

900000001000004080000200069023600000005000400000081000000000000100000004050300700

900000001000004080000200069023600000005000400000081000000000000100700000050300006

900000001000004087000200060023600900005000400000081000000000000100000004050300000

900000001000090000080200500003000000000000470009081000070400000100000800000300096

907000000000000080400200009023040000005000070000081000000000100100000004050300700

930000001000000080400200009000000000000000470009081000008409000106000000000300700

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