The New Sudoku Players' Forum

[m_b_metcalf]

And another with the first 49 empty cells and only 16 clues.

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..................................................5287.2..3..6.4.5.129..9...8.13.

Actually, 50 empty cells, making it the longest for leading (or trailing) cells.

Mike

[urhegyi]

And another with the first 49 empty cells and only 16 clues.

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..................................................5287.2..3..6.4.5.129..9...8.13.

Actually, 50 empty cells, making it the longest for leading (or trailing) cells.

Mike

Yes, a little miscalculation, 50 empty cells instead of 49.

[m_b_metcalf]

57 consecutive empty cells:

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 . . 1 . 2 . . 4 5
 6 . 7 . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . . . .
 . . . . . . 1 3 6
 . 3 . 8 1 6 7 9 2

Mike

[philvo]

My best one with (only) 49 leading cells :
.................................................5137832.4.85..1.536..82.475..9.3

Sorry for changing the original subject. I should have created a new topic.
Please see “3-row x-sudokus - Thread 2” for the continuation of the initial topic.
phil

[m_b_metcalf]

My best one with (only) 49 leading cells :
.................................................5137832.4.85..1.536..82.475..9.3

More tweaking:

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.................................................5137832.4.85..1.536..82.475..9.3   49
..................................................12783..4.87..1.536..8..475..9.3   50 
..................................................137836.4.85..1.5.6..82.482..9.3   50 

[urhegyi]

My record at the moment is 51 empty leading cells:

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...................................................9871.25.4..673.18..424.8.3.7.9

This was the first of a batch with at the moment 54 non minimal x-sudokus with 51 empty leading cells and always the same pattern with 22 clues.
If anyone could try to tweak them:

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...................................................9871.25748.673.18.5424.8.3.7.9
...................................................8392.53146.847.28.3913.8.6.4.2
...................................................8392.53146.847.28.3913.1.6.4.2
...................................................8399.53146.867.28.3913.1.6.4.2
...................................................9645.41386.292.45.7188.6.9.4.3
...................................................7842.16758.375.23.6419.3.4.5.2
...................................................7842.61758.975.23.6419.3.4.5.2
...................................................3126.85431.935.92.6489.7.6.2.3
...................................................6576.25318.487.96.1255.1.2.9.3
...................................................7181.98672.578.21.6495.2.4.1.7
...................................................4255.91463.784.73.2963.7.9.5.1
...................................................9653.56281.472.53.6986.4.1.5.2
...................................................9653.56281.472.53.6986.8.1.5.2
...................................................5746.32951.749.17.8357.1.3.6.9
...................................................5746.32951.749.17.8357.5.3.6.9
...................................................5746.32951.749.17.8327.2.3.6.9
...................................................5746.32951.749.17.8327.1.3.6.9
...................................................3252.15946.395.38.2743.8.2.5.1
...................................................9746.53297.893.86.4258.1.4.6.9
...................................................6216.75849.253.69.4184.9.2.7.6
...................................................3291.58426.384.69.1529.6.5.8.4
...................................................1621.53647.992.75.6144.7.2.3.5
...................................................6343.57189.698.64.5736.4.3.2.8
...................................................4829.58371.664.21.8531.8.5.9.7
...................................................9673.17428.927.98.4134.8.1.7.6
...................................................6731.37564.295.82.1677.6.1.8.5
...................................................3794.96352.882.91.4655.1.2.9.7
...................................................5125.37298.198.53.2764.7.8.9.3
...................................................8274.73526.826.94.7515.8.6.4.2
...................................................8274.73526.826.94.7535.8.6.4.2
...................................................3474.73526.826.94.7533.8.6.4.9
...................................................2974.73526.826.84.7535.8.6.4.9
...................................................1966.59827.482.75.6199.7.6.8.5
...................................................1986.59827.482.75.6199.7.6.8.5
...................................................9327.85396.131.62.7982.9.7.3.5
...................................................9727.85396.131.62.7982.9.7.3.5
...................................................9358.47132.972.94.5181.9.2.4.3
...................................................6252.43851.951.97.4868.7.1.3.2
...................................................4255.37162.921.49.7384.7.3.6.1
...................................................4632.59816.718.37.9523.9.5.1.4
...................................................5436.13497.227.81.3543.8.7.9.1
...................................................5713.57641.268.32.7597.2.9.6.3
...................................................9481.48657.369.47.8157.8.1.4.6
...................................................4962.53168.961.78.3528.7.5.6.4
...................................................1477.56329.443.91.5768.6.4.2.3
...................................................2647.28945.135.12.4979.4.5.6.8
...................................................2437.28945.135.12.4979.4.5.6.8
...................................................2542.49718.667.38.4928.3.4.5.7
...................................................6542.49718.667.38.4928.3.4.5.7
...................................................3542.49718.367.58.4928.3.4.5.7
...................................................4128.24931.693.26.5844.1.7.2.3
...................................................4128.24931.673.26.5844.1.7.2.3
...................................................7424.21386.993.62.4785.8.4.1.3
...................................................4675.67938.197.48.6538.3.6.2.9



[m_b_metcalf]

If anyone could try to tweak them:

I tried, but got no futher. Looks as though 51 really is the maximum. Here's a selection from my results:

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...................................................123.24.15.67.18.9...5.57.4.3.8   ED=2.9/1.2/1.2   
...................................................123..4.25.67.8..4...2.261.759.   ED=3.4/1.2/1.2   
...................................................123.23.14.56..1.527.4.85.96..2   ED=4.0/1.2/1.2   
...................................................123.21.43.56.78.12.4..63.7...8   ED=4.1/1.2/1.2   
...................................................123.24.51..6.57.83..1.61.4.3.7   ED=4.2/1.2/1.2   
...................................................123.4..21.56.35.46..7.28.9..3.   ED=4.3/1.2/1.2   
...................................................123.24.13.56.1..75..8.56.4...9   ED=4.4/1.2/1.2   
...................................................123.24.15.67.16.89..5.57.4...9   ED=4.5/1.2/1.2   
...................................................123..3.45.6..45.71....81.329.4   ED=5.4/1.2/1.2   
...................................................123.45.67.3..78.34.9..93.2..6.   ED=5.5/1.2/1.2   
...................................................123.43.56.7..56.8...2.97.3.4.5   ED=5.6/1.2/1.2   
...................................................123.14.25.67.8..4...2.27.8659.   ED=5.7/1.2/1.2   
...................................................123.45.6.....61.347.2.28.5.9.6   ED=6.3/1.2/1.2   
...................................................123.14.53.62.52.71.48.96.4..5.   ED=6.6/1.2/1.2   
...................................................123.43.56..7.75.82.96.98.1.3..   ED=7.1/1.2/1.2   
...................................................123.45.21.36.67.34..5.81.9...4   ED=7.2/1.2/1.2   
...................................................123.43.56.78.59.48..6.681.73.5   ED=7.3/1.2/1.2   
...................................................123.45.67.8...1.95..6.96.137.4   ED=7.4/1.2/1.2   
...................................................123.45.12.67.1..83..4.26.5.3..   ED=7.7/1.2/1.2   
...................................................123.2..41.56.75.82.4..96.73..2   ED=8.2/1.2/1.2   
...................................................123..4.56.72.721.4.35.58.2.9.1   ED=8.3/1.2/1.2   
...................................................123.34.56.7..76.142...15.8...9   ED=8.4/1.2/1.2   
...................................................123.34.15.67.65.742...17.8...9   ED=8.4/2.0/2.0   
...................................................123.34.56..7.65.17..8.81.3..59   ED=8.5/1.2/1.2   
...................................................123.45.61.37.7..342.5.81.27.94   ED=8.8/1.2/1.2   
...................................................123..4.53....51.26.47.78.4.6.5   ED=8.9/1.2/1.2   
...................................................123..4.56.7..76.1423..15.83.49   ED=9.0/1.2/1.2   
...................................................123.34.52.6..72.4...8.61.73.92   ED=9.1/1.2/1.2   
...................................................123.43..5.67.86.27.9..97.8..54   ED=9.2/1.2/1.2   
...................................................123..4..5.36.37.16.42.658.3..7   ED=9.3/1.2/1.2   
...................................................123.42.56..7.37.84..6.16.2..35   ED=9.4/1.2/1.2   
...................................................123.4..56..7.17.84..6.62.9.3.5   ED=9.7/1.2/1.2