The New Sudoku Players' Forum

by **creint** » Mon Jan 31, 2022 8:01 pm

Code: Select all: g49_158d 0.2s singles only g64_159d 0.3s 1 layer of locked sets and some locked singles g81_160d 0.6s 2 layers of locked sets and some locked singles g100_157d 1.0s singles only

G36_160 m_b_metcalf, really SE >= 10, not solved with logic, many difficult layers. 1.5s with MiniSat (or 0.15s when cleaned first).

No larger or harder ones < SE 10 available?

m_b_metcalf what are your timings?

by **m_b_metcalf** » Tue Feb 01, 2022 9:37 am

creint wrote:m_b_metcalf what are your timings?

It's tedious slogging through them all, but here are two timings:

Code: Select all: g81_160d SE4.0 0.9s (hidden triplet) G36_160_m_b_metcalf SE~9 69s (contradictions)

HTH

Mike

by **m_b_metcalf** » Tue Feb 01, 2022 10:28 am

creint wrote:No larger or harder ones < SE 10 available?

IMHO, this 36x36 X-sudoku, due to hkociemba1, is SE10+:

Code: Select all: . 2 . 8 35 . . 12 9 16 . 21 26 28 . . 27 20 22 33 . . 36 17 13 . 5 14 23 . . 18 15 . 19 . . . . 21 . . . 35 . 15 3 27 9 5 13 2 30 10 32 8 7 20 25 34 17 26 28 . 11 . . . 36 . . . 10 . . . . 9 19 30 2 1 . 17 . . 33 . . 34 5 . . 28 . . 16 . 27 18 12 36 6 . . . . 26 . 7 . . 16 . . 13 20 . 23 . . . 6 25 . 17 15 . 2 18 . . . 31 . 21 1 . . 29 . . 3 . 34 . . 20 . 15 . 8 4 28 11 . 1 12 . 24 . 14 16 . 31 . 9 27 . 29 30 6 33 . 7 . 2 . . 17 17 3 . . 12 . 14 . 18 5 . . . 16 19 . 35 11 26 1 . 23 30 . . . 10 32 . 8 . 9 . . 27 22 2 . 24 5 7 22 . 1 23 . . 25 . . 26 13 11 . . 27 16 3 . . 33 . . 28 19 . 29 30 9 15 . 34 33 26 . . 14 . . . . 9 5 2 27 6 . 36 . . . . 21 . 31 28 3 34 12 . . . . 16 . . 18 32 . . 3 . 28 18 32 . . 19 33 . 7 . 15 . 25 2 36 6 . 29 . 9 . 8 4 . . 35 11 5 . 20 . . . . 12 . . . 3 22 . . . . . . 28 16 . 31 18 . 26 4 . . . . . . 6 21 . . . 23 . . . . 34 . . . 21 18 . . . 31 12 19 . 35 33 3 30 2 13 . 23 24 5 . . . 16 22 . . . 28 . . 4 . 21 . . 35 11 16 8 12 28 . 32 30 . . . 18 14 . . . 19 33 . 13 20 1 25 7 27 . . 24 . 10 6 24 25 . 31 16 . . . . 22 5 . 34 8 23 15 4 33 30 3 2 32 . 29 9 . . . . 18 14 . 35 1 36 . . . . . 12 . . . . . . . . . . . . . . . . . . . . . . . . 17 . . . . . 23 27 8 22 26 28 15 . 16 . . 33 19 24 . . 7 . . 17 . . 4 18 30 . . 36 . 5 2 32 10 12 34 29 . 35 . . . . . . . . 8 . . . . . . 16 31 . . . . . . 24 . . . . . . . . 4 . . . . 10 18 . . . . . 20 . 25 . . . . 5 27 . . . . 36 . 6 . . . . . 21 24 . . . 3 36 1 34 11 . 6 . 13 . 12 . 31 32 . . . . . . . . 21 25 . 20 . 16 . 4 . 23 30 7 26 5 19 21 6 17 8 . 16 . 29 . 30 . 22 25 . . . . . . . . 7 15 . 4 . 20 . 32 . 33 27 31 23 12 . . . 23 25 . . . . . 7 . 21 . . . . 24 13 . . . . 16 . 35 . . . . . 28 4 . . . . 13 . . . . . . . . 1 . . . . . . 32 3 . . . . . . 18 . . . . . . . . 29 . 26 28 4 15 34 31 33 . 14 . . 18 11 29 . . 20 . . 23 . . 5 10 36 . . 13 . 2 21 3 1 22 17 25 . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . 30 . . . . . 27 9 33 . 10 5 . . . . 21 4 . 23 31 18 28 1 11 32 29 19 22 . 7 25 . . . . 36 8 . 13 24 2 36 . 14 . . 23 24 28 5 4 18 . 6 26 . . . 12 9 . . . 27 19 . 1 7 33 20 30 32 . . 29 . 3 . . 11 . . . 31 25 . . . 1 4 17 . 10 8 30 21 20 35 . 34 7 14 . . . 24 3 . . . 2 . . . . 9 . . . 23 34 . . . . . . 20 19 . 28 29 . 8 5 . . . . . . 4 6 . . . 14 . . . . 15 . 17 8 22 . . 14 29 . 33 . 2 . 36 35 25 28 . 31 . 26 . 12 19 . . 16 13 24 . 10 . . 30 6 . . 27 . . . . 32 9 8 23 7 . 1 . . . . 12 . 3 13 22 10 36 . . . . 34 . . 11 28 35 . 10 26 3 21 . 6 7 . . 19 . . 34 11 14 . . 18 32 24 . . 15 . . 31 17 . 9 1 22 5 . 33 18 15 . . 5 . 12 . 11 8 . . . 33 9 . 26 19 24 16 . 30 28 . . . 3 4 . 1 . 31 . . 25 21 9 . . 3 . 36 . 17 24 21 27 . 34 4 . 22 . 7 8 . 14 . 10 11 . 30 26 25 31 . 28 . 35 . . 13 . 22 . . 21 . . 9 15 . 2 . . . 35 5 . 29 12 . 33 27 . . . 23 . 19 36 . . 11 . . 7 . 32 . . . . 10 1 20 26 33 . 6 . . 12 . . 8 4 . . 13 . . 18 . 11 5 7 14 22 . . . . 27 . . . 27 . . . 4 . 36 16 7 30 31 11 15 24 23 19 3 5 26 35 21 6 33 29 . 32 . . . 12 . . . . 8 . 11 23 . . 5 31 30 . 29 36 20 . . 10 25 7 9 . . 1 2 27 . 22 24 15 . . 26 14 . 33 . X-sudoku

by **philvo** » Tue Feb 01, 2022 11:42 am

Hello creint,
1.5 s for the G160_36_mike ! Very impressive ! From now on, I will hesitate to publish performances on my solver !
Phil

by **philvo** » Tue Feb 01, 2022 11:45 am

Hello Mike,
I will check you last grids with interest.
I have also worked on the 64x64 X-sudoku you have upgraded (your post Tue May 18, 2021 6:33 pm)
I have removed 40 additionnal cells by keeping the horizontal and vertical symmetry. I rate this grid EXTREME-23.
The removed cells are marked by X (to change by a dot for a clean grid).

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . 49 41 . 55 42 40 21 7 39 . 34 30 59 . . 51 . 13 25 . 31 23 9 . 60 53 33 35 3 . . 27 4 12 32 24 . 64 54 52 . 44 6 . 47 . . 8 29 43 . 22 2 37 16 57 10 . 62 5 . .
. 54 . . 47 . 50 7 58 57 . 49 . . . 26 . 14 40 29 63 . 15 . 55 20 56 21 10 . 44 . . 1 . 46 61 6 37 59 . 3 . 60 35 27 2 . 52 . . . 62 . 5 19 30 51 . 22 . . 64 .
. 6 . . 24 17 . 14 20 . 8 11 . 16 35 54 . 48 . 32 . 2 . 49 . . . . 12 22 23 38 13 39 63 51 . . . . 56 . 15 . 18 . 26 . 33 3 64 . 55 36 . 46 34 . 29 31 . . 28 .
. . 1 2 . 21 19 13 47 . 5 4 . 50 63 55 24 17 11 27 37 . 38 53 34 . . 62 . 15 46 29 33 28 52 . 36 . . 42 49 7 . 61 22 8 51 10 48 60 12 . 58 32 . 16 3 43 23 . 18 20 . .
. 43 . 15 44 . 3 32 1 24 17 . 25 51 31 52 47 62 33 64 9 28 60 . 4 36 X 13 40 . 37 16 2 11 . 34 14 X 26 56 . 12 5 53 48 21 41 20 57 54 39 7 . 59 45 30 55 63 . 8 58 . 42 .
. 23 20 . 22 58 . 63 . . 6 13 3 . 37 . . . 4 5 . 34 35 . 8 . 14 27 . 32 41 30 29 43 21 . 19 44 . 7 . 59 36 . 33 39 . . . 18 . 56 47 42 . . 9 . 17 60 . 52 46 .
. 48 38 12 59 5 16 . . . 23 9 36 28 . 60 10 21 30 54 22 . . . 19 49 24 58 . . 64 . . 25 . . 3 53 47 40 . . . 45 46 4 17 32 34 . 35 14 41 1 . . . 39 26 6 13 27 2 .
. 49 33 53 7 28 . . . . 19 58 6 . 13 16 51 15 . 35 34 37 23 43 . . 31 41 . 46 48 40 63 60 30 . 24 2 . . 14 21 3 22 17 . 39 9 64 56 . 4 29 50 . . . . 55 52 12 61 36 .
. 26 2 . . 14 . . . . . 23 . 17 18 . 9 5 38 . 45 24 . 52 11 51 12 . 60 19 62 56 32 21 42 7 . 28 54 57 59 . 63 49 . 29 33 47 . 36 53 . 61 . . . . . 41 . . 43 44 .
. 61 . 45 64 34 44 55 27 . . 63 . . 54 . . . 28 47 29 6 X 32 24 39 18 . 42 14 57 . . 51 19 43 . 37 56 22 60 X 48 46 31 16 . . . 41 . . 38 . . 23 58 3 2 62 26 . 15 .
. . 24 25 15 . 38 19 44 51 2 . 35 39 . 12 40 27 10 48 . . X 13 21 52 29 50 16 . . 23 64 . . 26 17 41 46 45 1 X . . 5 54 30 34 37 . 11 58 . 6 60 8 53 31 . 4 14 47 . .
. 31 . . . 60 54 29 62 . . 41 . 38 46 . 11 25 59 33 18 4 . . . . 36 . 64 . . 63 35 . . 48 . 39 . . . . 53 51 15 2 20 44 . 27 13 . 24 . . 22 5 56 57 . . . 17 .
. . . . 50 8 . . . 34 . 24 . . . . . 30 17 21 39 . 46 . . . 22 55 . . . 2 3 . . . 11 52 . . . 57 . 35 58 28 23 . . . . . 31 . 26 . . . 49 42 . . . .
. 52 . 17 23 11 27 . 50 32 20 . 60 59 . . 14 41 . 42 . . 64 . 37 . 45 43 7 3 53 15 36 29 44 8 31 5 . 62 . 10 . . 4 . 40 56 . . 30 16 . 28 51 49 . 6 9 63 19 . 13 .
. . 56 46 10 39 . 51 31 . . 64 . . . . 60 53 8 12 1 20 55 . 44 . 32 4 26 17 13 35 50 59 23 15 58 34 . 6 . 41 37 36 19 52 18 62 . . . . 25 . . 7 27 . 38 24 28 16 . .
. . . . 36 31 . 21 54 35 . X 46 . 39 6 . . 32 24 . 41 . . 51 63 . 52 . . . 8 43 . . . 44 . 27 13 . . 60 . 7 18 . . 12 49 . 57 X . 4 33 64 . 45 55 . . . .
. 34 51 3 20 25 . 15 10 X . X 21 37 57 29 . . . 4 5 61 2 35 13 9 62 26 48 . . 42 1 . . 22 53 38 30 47 43 46 41 28 27 . . . 7 52 16 45 X . X 36 19 . 31 39 11 24 40 .
. . 13 . 56 52 53 59 . 8 42 48 24 47 . 20 16 . . . 51 64 33 14 57 7 . 61 50 34 5 . . 23 28 41 49 . 4 25 19 58 45 11 . . . 38 40 . 32 35 43 44 1 . 46 29 62 27 . 26 . .
. 40 23 63 14 26 29 39 4 . 53 31 43 27 3 7 59 57 . . . . 8 . . 44 33 . . 30 . 1 52 . 37 . . 18 35 . . 17 . . . . 21 6 56 62 28 41 51 11 . 50 61 42 25 34 32 13 22 .
. 35 8 . 19 44 . 58 63 9 15 . 50 12 . 17 . 45 49 . . 11 . 31 32 3 . 6 . 53 2 46 26 34 7 . 56 . 64 51 29 . 59 . . 61 1 . 22 . 47 60 . 5 14 24 4 . 43 20 . 21 16 .
. . . 16 . 30 64 . 34 13 61 . 44 56 . 22 20 40 63 . 28 . 6 47 31 . 35 . . 4 49 . . 54 15 . . 10 . 5 37 62 . 52 . 9 53 24 25 . 8 46 . 27 19 21 . 59 58 . 2 . . .
. 24 50 . 57 42 17 . 11 . 28 62 . 52 33 23 . 34 43 36 . 30 . 58 29 21 41 X 25 64 47 . . 32 16 6 X 46 59 31 20 . 49 . 40 26 35 . 61 2 55 . 9 37 . 54 . 60 8 18 . 44 63 .
. 27 . 4 60 . . . 5 26 49 18 . . . . . 56 62 . 10 1 48 . . 16 11 15 14 . . 43 40 . . 50 45 21 61 . . 44 31 57 . 34 25 . . . . . 39 58 20 6 . . . 41 9 . 33 .
. 20 41 . 16 61 13 10 . 55 57 38 . 43 53 34 44 39 46 . 8 14 36 . . . . . . 29 31 28 59 35 64 . . . . . . 56 32 2 . 7 9 25 54 50 24 . 45 47 30 . 11 27 4 12 . 22 37 .
. . 47 . . 19 . 4 . 29 56 3 . . . . 35 20 27 30 23 . 24 25 . . 5 14 53 54 11 9 46 57 10 52 39 42 . . 17 61 . 62 12 45 13 36 . . . . 33 64 38 . 49 . 16 . . 6 . .
. 18 64 . . 45 31 30 . 11 33 46 62 54 19 58 . 52 . 26 . 15 1 56 . 23 . . 34 63 27 7 9 16 61 36 . . 22 . 44 6 57 . 38 . 10 . 17 20 48 25 13 4 12 . 21 2 50 . . 3 60 .
. 62 29 . 48 37 36 43 25 . . 7 . 26 49 28 45 38 64 . 53 . 16 22 . 60 . . . 56 61 . . 12 54 . . . 6 . 50 34 . 5 . 11 46 15 1 44 51 . 23 . . 58 32 33 30 13 . 19 8 .
. 17 5 58 . 54 . . . 16 64 45 13 . 8 30 . 32 42 . . . 49 62 . 25 43 . . . . . . . . . . 56 28 . 3 22 . . . 35 59 . 6 39 . 31 11 52 63 . . . 18 . 20 46 10 .
. 32 . 55 52 . 56 . 9 47 51 . . 22 24 2 . . 34 43 54 57 50 . 26 X 20 10 . . . X X . . . 37 1 X 17 . 8 4 58 28 40 . . 27 59 42 . . 49 7 61 . 14 . 44 45 . 31 .
. 12 15 34 26 24 11 23 17 50 18 . . . 20 40 . . 48 . 31 10 3 . 39 37 4 1 . . . . . . . . 63 55 25 38 . 42 54 30 . 60 . . 29 35 . . . 53 9 57 43 47 56 59 41 28 5 .
. . . 49 27 53 60 . 15 10 . X 61 35 42 32 4 58 . 11 40 . . 63 41 22 3 . . 8 . . . . 34 . . 50 20 29 47 . . 31 23 . 14 1 18 16 2 55 X . 28 62 . 38 64 25 17 . . .
. . . 54 35 48 32 . 57 20 . X 23 44 38 9 55 29 . 25 30 . . 11 33 28 13 . . 27 . . . . 12 . . 22 50 43 2 . . 42 62 . 61 64 59 10 63 52 X . 56 47 . 17 5 36 15 . . .
. 30 19 20 2 50 34 17 29 46 54 . . . 14 42 . . 53 . 62 31 4 . 48 26 21 12 . . . . . . . . 18 33 5 3 . 47 8 15 . 25 . . 9 22 . . . 7 23 55 57 16 24 64 61 37 11 .
. 51 . 1 41 . 33 . 36 62 16 . . 8 64 10 . . 47 9 13 60 17 . 46 X 58 22 . . . X X . . . 29 40 X 52 . 20 11 12 37 59 . . 2 5 49 . . 3 32 4 . 44 . 50 27 . 48 .
. 16 7 52 . 27 . . . 43 55 21 22 . 25 48 . 49 12 . . . 42 59 . 56 19 . . . . . . . . . . 17 2 . 41 1 . . . 10 4 . 44 14 . 39 53 33 24 . . . 28 . 40 30 32 .
. 4 44 . 42 10 43 49 30 . . 56 . 31 61 59 27 33 50 . 52 . 32 7 . 8 . . . 37 15 . . 36 25 . . . 57 . 26 28 . 39 . 51 24 5 38 34 6 . 54 . . 12 62 58 46 19 . 9 21 .
. 38 55 . . 46 5 9 . 19 12 1 7 3 27 33 . 22 . 58 . 40 37 54 . 30 . . 18 24 63 57 4 42 41 47 . . 49 . 32 45 52 . 56 . 60 . 16 25 61 64 8 15 31 . 29 34 35 . . 14 26 .
. . 22 . . 12 . 31 . 52 47 50 . . . . 5 18 24 44 20 . 21 36 . . 34 16 9 55 4 32 53 46 62 60 10 59 . . 38 30 . 29 63 3 27 40 . . . . 48 57 58 . 33 . 51 . . 7 . .
. 8 11 . 37 40 47 24 . 18 58 26 . 4 32 39 64 19 16 . 3 46 43 . . . . . . 60 10 44 61 13 27 . . . . . . 14 33 9 . 48 22 57 42 21 1 . 28 62 41 . 45 52 12 56 . 2 25 .
. 44 . 29 54 . . . 61 41 35 12 . . . . . 31 36 . 6 3 18 . . 13 39 47 28 . . 24 48 . . 59 57 23 1 . . 5 7 56 . 62 19 . . . . . 10 8 33 32 . . . 51 60 . 49 .
. 10 3 . 32 51 26 . 39 . 4 8 . 49 56 1 . 2 19 40 . 21 . 42 16 48 54 X 31 62 35 . . 44 11 58 X 29 36 46 57 . 28 . 61 55 37 . 60 53 9 . 14 30 . 52 . 41 22 43 . 64 23 .
. . . 13 . 23 8 . 14 54 44 . 9 62 . 3 53 43 37 . 35 . 28 24 10 . 63 . . 2 60 . . 41 5 . . 64 . 19 58 25 . 17 . 1 42 46 4 . 26 47 . 20 57 59 . 45 48 . 29 . . .
. 58 14 . 17 41 . 61 46 36 26 . 47 34 . 57 . 8 13 . . 39 . 38 15 29 . 44 . 25 56 5 49 9 24 . 12 . 52 33 53 . 35 . . 20 64 . 3 . 37 2 . 43 50 28 10 . 40 54 . 11 55 .
. 36 39 43 4 16 45 28 59 . 21 2 37 33 58 31 25 64 . . . . 10 . . 55 53 . . 1 . 51 18 . 35 . . 27 63 . . 26 . . . . 6 41 49 38 5 11 40 24 . 13 12 61 20 30 57 56 47 .
. . 52 . 62 33 49 37 . 60 10 51 15 11 . 64 23 . . . 44 12 56 30 6 18 . 46 45 57 14 . . 3 2 13 22 . 34 39 40 4 29 8 . . . 21 63 . 31 17 19 41 36 . 59 53 42 32 . 25 . .
. 21 6 56 5 59 . 38 53 X . X 32 63 40 19 . . . 49 14 27 41 1 36 64 37 34 11 . . 3 51 . . 62 25 8 42 30 33 23 47 13 54 . . . 55 46 45 29 X . X 35 24 . 44 17 50 58 52 .
. . . . 46 35 . 53 13 6 . X 30 . 22 24 . . 7 62 . 5 . . 12 41 . 23 . . . 50 37 . . . 20 . 60 28 . . 2 . 10 49 . . 51 58 . 15 X . 54 64 1 . 21 14 . . . .
. . 17 57 21 4 . 22 16 . . 10 . . . . 43 7 39 55 24 13 30 . 3 . 52 29 32 48 8 20 34 56 40 44 60 45 . 41 . 35 14 18 2 6 50 61 . . . . 64 . . 26 38 . 27 28 1 33 . .
. 41 . 61 58 15 12 . 24 63 14 . 26 20 . . 36 9 . 10 . . 27 . 42 . 1 37 19 21 45 55 62 31 43 23 46 47 . 8 . 33 . . 57 . 48 7 . . 52 6 . 56 35 11 . 5 34 29 44 . 18 .
. . . . 30 13 . . . 56 . 25 . . . . . 46 45 28 17 . 54 . . . 50 7 . . . 4 39 . . . 64 20 . . . 60 . 1 8 53 62 . . . . . 34 . 59 . . . 61 35 . . . .
. 56 . . . 62 20 45 8 . . 57 . 19 44 . 34 12 35 37 4 32 . . . . 27 . 47 . . 61 7 . . 9 . 25 . . . . 21 41 59 46 28 39 . 15 54 . 2 . . 1 23 36 3 . . . 50 .
. . 36 28 6 . 25 52 43 64 41 . 18 21 . 45 15 16 61 50 . . X 44 23 35 51 63 56 . . 53 30 . . 2 27 49 17 10 4 X . . 26 58 34 54 47 . 57 38 . 55 8 3 31 20 . 11 46 42 . .
. 19 . 31 55 7 10 44 6 . . 35 . . 34 . . . 18 8 47 52 X 5 25 57 38 . 58 16 54 . . 61 29 1 . 32 11 24 12 X 40 3 43 15 . . . 28 . . 37 . . 48 56 22 60 21 64 . 41 .
. 33 46 . . 43 . . . . . 47 . 53 55 . 38 1 31 . 41 22 . 21 60 10 6 . 62 12 9 34 54 52 36 4 . 16 15 18 11 . 56 20 . 19 44 45 . 61 7 . 30 . . . . . 63 . . 48 24 .
. 59 48 37 8 64 . . . . 1 61 51 . 23 5 62 11 . 56 19 58 40 20 . . 46 31 . 44 39 26 57 50 13 . 28 3 . . 25 55 17 27 36 . 32 42 10 45 . 12 60 16 . . . . 52 9 54 4 43 .
. 13 37 60 61 38 52 . . . 59 30 55 25 . 46 7 6 22 2 58 . . . 17 47 28 51 . . 34 . . 64 . . 54 62 3 50 . . . 19 14 44 29 26 45 . 41 21 57 35 . . . 23 53 16 8 63 4 .
. 14 12 . 51 18 . 16 . . 50 20 11 . 1 . . . 41 38 . 8 61 . 43 . 59 60 . 45 25 22 27 55 57 . 52 63 . 9 . 39 6 . 24 17 . . . 26 . 23 5 48 . . 42 . 15 3 . 36 56 .
. 53 . 10 43 . 1 48 12 38 37 . 39 23 52 63 31 35 20 45 36 62 51 . 56 50 X 18 41 . 30 54 22 15 . 25 8 X 7 34 . 11 64 4 13 5 55 3 58 47 60 33 . 19 16 42 40 21 . 46 49 . 29 .
. . 4 19 . 63 22 46 49 . 60 53 . 2 26 47 33 24 44 39 57 . 13 40 61 . . 3 . 42 29 21 16 6 14 . 51 . . 1 62 37 . 34 41 36 54 35 32 7 10 . 50 38 . 9 17 11 59 . 52 31 . .
. 3 . . 29 20 . 64 45 . 13 43 . 24 4 56 . 63 . 16 . 53 . 10 . . . . 35 49 55 48 19 2 47 31 . . . . 46 . 1 . 25 . 58 . 30 6 14 . 52 39 . 40 22 . 33 26 . . 61 .
. 50 . . 9 . 41 42 3 5 . 36 . . . 35 . 26 23 14 43 . 29 . 53 19 15 32 37 . 33 . . 20 . 45 30 60 21 11 . 51 . 47 16 56 52 . 8 . . . 4 . 46 18 54 12 . 2 . . 62 .
. . 62 32 . 47 39 8 18 40 22 . 48 6 29 . . 28 . 15 12 . 59 19 1 . 16 38 46 58 36 . . 49 26 37 41 4 . 35 27 53 . 21 45 . 43 . . 13 17 61 . 63 3 25 44 64 14 . 34 50 . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

phil

by **m_b_metcalf** » Tue Feb 01, 2022 1:06 pm

philvo wrote:Hello Mike,
I will check you last grids with interest.
I have also worked on the 64x64 X-sudoku you have upgraded (your post Tue May 18, 2021 6:33 pm)
I have removed 40 additionnal cells by keeping the horizontal and vertical symmetry. I rate this grid EXTREME-23.
The removed cells are marked by X (to change by a dot for a clean grid).

My summary of the results for the different versions is:

Code: Select all: your original 19s SE~7 - 8 2536 givens 13.5.2021 44s SE~7 - 8 2504 givens 18.5.2021 37s SE5.0 2400 givens one above 382s SE~9 2460 givens

Regards,

Mike

by **creint** » Tue Feb 01, 2022 8:12 pm

My solver is not that fast, SAT solvers are fast.

Code: Select all: one above ~650-730s SE~9 many layers of nets.

If you have time for it m_b_metcalf, can you give next step for following pencilmarks:
Sudoku 36x36
https://pastebin.com/Mp8srRGn

X-Sudoku 36x36
https://pastebin.com/PRN7xVPa

by **m_b_metcalf** » Wed Feb 02, 2022 8:36 am

creint wrote:If you have time for it m_b_metcalf, can you give next step for following pencilmarks:
Sudoku 36x36
https://pastebin.com/Mp8srRGn

X-Sudoku 36x36
https://pastebin.com/PRN7xVPa

Could you possibly provide the pencilmarks for these sukakus in this format:

Code: Select all: 13,34 33 7,27 16 18 1,19 5 36 29 15 8,19,24 etc.

?

by **creint** » Wed Feb 02, 2022 1:51 pm

Replace spaces with single space, convert remaining spaces with newline:

Sudoku 36x36 lines
https://pastebin.com/NK1Cdn2g

X-Sudoku 36x36 lines
https://pastebin.com/pH3bj353

by **philvo** » Wed Feb 02, 2022 3:49 pm

Hello Mike,
For grids in your mail (Mon Jan 31, 2022 7:02 pm), the results are :
#1 Grid 100x100 (75 5 63 26 . 16 . 70 56 51 27 . . . 41 64) : Evil-20 / 1h37 to solve
#2 Grid 100x100 (. 1 . 93 44 54 . 49 45 52 100 16 24) : Evil-20 / 10 min to solve
#3 Grid 100x100 (grid 2 with 9 cells removed) : Evil-20 / 25 min to solve
#5 X-sudoku 36x36 by hkociemba1 (mail Tue Feb 01, 2022 10:28 am) : incredible difficulty. I try different solving methods, but up to now, I didn't get the solution.
Phil.

by **m_b_metcalf** » Wed Feb 02, 2022 5:01 pm

philvo wrote:#5 X-sudoku 36x36 by hkociemba1 (mail Tue Feb 01, 2022 10:28 am) : incredible difficulty. I try different solving methods, but up to now, I didn't get the solution.

Nor do I!

by **m_b_metcalf** » Wed Feb 02, 2022 5:05 pm

creint wrote:Sudoku 36x36 lines
https://pastebin.com/NK1Cdn2g

My program solves this in 54s, telling me as a start that

Hidden Text: Show

X-Sudoku 36x36 lines
https://pastebin.com/pH3bj353

I am unable to solve this puzzle. I assume it's SE10+.

[Edit: I see now that this is the hkociemba1 puzzle above. You could have mentioned that!]
Mike

by **creint** » Thu Feb 03, 2022 8:21 pm

G36_160_m_b_metcalf SE~9 69s (contradictions), 54s with the pencilmarks I gave.
My solver can now solve this in 386s using locked sets with size 2-4 inside nets.
It can solve some SE 9.9 sudoku without using those nets, so its probably on the high end of SE 9.
How can your solver be so fast?

by **m_b_metcalf** » Fri Feb 04, 2022 8:36 am

creint wrote:How can your solver be so fast?

That's hard to answer. I use a completely different technique based solely on logic, no brute force. It appears to be a better approch for this particular problem.

M

by **philvo** » Sun Feb 06, 2022 8:15 pm

Hello,
I (and my PC) spent part of the week-end trying to solve the 36 X-sudoku by hkociemba1.
I reached level EXTREME-145, but I have not found the solution yet !
This grid certainly has a record of difficulty for 36x36 X-sudoku.

By the way, my personal record is this 3-symmetry 16x16 X-sudoku that I have generated some years ago.
I rate this X-sudoku EXTREME-446.

. . . . 16 12 . . . . 7 3 . . . .
. . . . . 2 . 7 4 . 11 . . . . .
. . . 6 11 1 15 10 9 5 2 8 14 . . .
. . 1 . . . . 3 6 . . . . 7 . .
10 . 9 . . . . 12 5 . . . . 4 . 2
8 14 3 . . . . 2 1 . . . . 13 5 7
. . 4 . . . . . . . . . . 16 . .
. 6 16 5 3 13 . . . . 8 14 1 11 12 .
. 2 5 13 9 11 . . . . 1 16 8 15 4 .
. . 8 . . . . . . . . . . 12 . .
1 12 10 . . . . 6 14 . . . . 5 9 11
3 . 11 . . . . 1 8 . . . . 2 . 13
. . 14 . . . . 5 3 . . . . 8 . .
. . . 9 14 7 2 11 16 10 13 1 4 . . .
. . . . . 9 . 16 2 . 14 . . . . .
. . . . 12 4 . . . . 5 6 . . . .

phil

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