gomo64 wrote:Hello Steve.

I am working in this puzzle.

So I will be back.

Wish me Luck.

Hi,

Some comfort to know that this particular puzzle is very Fiendish, and I will give you part of my solver program output for this. The thing that makes it unusual is that the normal rules for a digit only once in a Row/Col/Sq actually yield no results at all !

The first 3 Iterations were spent applying rules that eliminated certain digit options for certain cells, and it is only on Iteration 4 that the 'normal' rules apply and it should solve from there

Cell Lebelling is 1 based , i.e (1,2) refers to r1c2

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Iteration Number 1

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Testing for Unique Placements

Test all Digits for unique to Row/Col/Sq

Testing for Pairs/Triplets [Rows]

Row 7 - Digit 2 is a Pair in the same Square ~ Columns = 1, 2

Digit 2 not allowed Cell( 9, 1)

Digit 2 not allowed Cell( 9, 3)

Row 8 - Digit 6 is a Pair in the same Square ~ Columns = 8, 9

Digit 6 not allowed Cell( 9, 9)

Digit 6 not allowed Cell( 9, 7)

Testing for Pairs/Triplets [Columns]

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Iteration Number 2

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Testing for Unique Placements

Test all Digits for unique to Row/Col/Sq

Testing for Pairs/Triplets [Rows]

Testing for Pairs/Triplets [Columns]

Col 7 - Digit 6 is a Pair in the same Square ~ Rows = 4, 5

Digit 6 not allowed Cell( 4, 8)

Digit 6 not allowed Cell( 5, 8)

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Iteration Number 3

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Testing for Unique Placements

Test all Digits for unique to Row/Col/Sq

Testing for Pairs/Triplets [Rows]

Testing for Pairs/Triplets [Columns]

Testing for x,y Pairs of Digits [Rows]

Testing for x,y Pairs of Digits [Columns]

Col 8 - Digits 6 & 7 are a Pair into Rows = 38

Digit 3 not allowed Cell( 3, 8)

Digit 8 not allowed Cell( 3, 8)

Digit 1 not allowed Cell( 8, 8)

Digit 9 not allowed Cell( 8, 8)

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Iteration Number 4

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Testing for Unique Placements

Test all Digits for unique to Row/Col/Sq

43 - Cell( 7, 8) = 1

44 - Digit 1 Only position in Row( 8) is Cell( 8, 1)

All Digit = 1 allocated

45 - Cell( 7, 9) = 3

46 - Digit 8 Only position in Row( 7) is Cell( 7, 2)

Hope this doesn't spoil your fun in doing this manually, but this one really is more Fiendish than most - a 'unique placment' is the term I use if that digit is the only available candidate for a cell. Up to this point there haven't been any, but there are form here on.

If you want the rest of the log file - then just post a Yes Please

Good luck.