The New Sudoku Players' Forum

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The Miracle is an anti-knight, anti-king, non-consecutive sudoku, which means that as well as normal Sudoku rules (that is, the numbers from 1 to 9 must appear only once in each row, column, and cage) the following rules also apply:

1. Anti-knight rules: no two squares that are a knight's move apart can have the same digit. (The knight's move is 2 along and 1 to the side, as in chess.)

2. Anti-king rules: no two squares that touch either horizontally, vertically or diagonally can have the same digit. (As in, no two squares a chess king can move between in a single move.)

3. Non-consecutive rules: no two squares that are horizontally or vertically adjacent can have consecutive numbers.

Each of these extra rules brings a new dimension to Sudoku and the result is an exquisite puzzle, which dazzles by starting with so little information - just two clues! -and yet has a unique solution. Hence it's name, the Miracle.

Text cut & pasted from this article: here.

There is a video clip on the BBC (UK) about people flocking to a youtube channel (Cracking The Cryptic) to watch Mark Goodliffe and Simon Anthony solve sudokus for entertainment and relaxation. BBC video: here, Cracking The Cryptic YouTube channel: here, Cracking The Cryptic solving The Miracle Sudoku (25m47s video): here.
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[1to9only]

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Cracking The Cryptic solving The New Miracle Sudoku (28m45s video): here

[Mathimagics]

... the result is an exquisite puzzle, which dazzles by starting with so little information - just two clues! -and yet has a unique solution. Hence it's name, the Miracle

That's cool, but I would remind people that we have already created puzzles with zero clues, and even less rules: Absolutely Clueless

[1to9only]

SukakuExplainer rates the 2 Miracle puzzles as:

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......................................1............2............................. ED=2.9/1.2/1.2
......................4......3................................................... ED=2.9/2.9/2.5


[Leren]

We've done clueless Str8ts to death years ago. Here is an example. Paste the following link into your browser's URL box and up will pop a picture of the puzzle. is.gd/Clueless_Str8ts

There are no clues, only one hint : Cell F3 is not 3. The solution is quite easy.

You can find out the rules of Str8ts here.

Leren

[tarek]

The miracle is that they found easy to solve 2 clue puzzles.

I attempted generating puzzles of this variant. I had many symmetric 2 clue puzzles!

tarek

[Hajime]

I discovered another miracle...

The same puzzle

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. . . . . . . . .   
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. . 1 . . . . . .   
. . . . . . 2 . .   
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. . . . . . . . .

But slightly adjusted rules:
Normal Sudoku rules apply. Any two cells separated by a knight's move or
a king's move (in chess) cannot contain the same digit.
Any two orthogonally diagonally adjacent cells cannot contain consecutive digits
(which is Ferz non consecutive, to remain in the chess moves)
leads to a far more difficult puzzle with a unique solution!

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

Watch the sequence of digits per row.
Indeed amazing...

[Hajime]

And the same for

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. . . . . . . . .   
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. . . . 4 . . . .   
. . 3 . . . . . .   
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with the diagonally FERZ non consecutive rule gives:

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


watch the sequences in the columns