Post the puzzle or solving technique that's causing you trouble and someone will help

I have encountered some "Twin Sudoku" puzzles, but I'm not sure what is meant by the instructions, particularly the last part.

"Twin Sudoku" consists of a pair of standard sudoku puzzles each with some starting digits. To get a complete solution for the twin puzzles, it is necessary to solve each twin puzzle, but the complete solution of the twin puzzles will be obtained by substituting the corresponding values of the digits from one twin sudoku into the other.

What exactly do they mean by "substituting the corresponding values of the digits"? What/where are the "corresponding values"?

Here are the two sets of puzzles:

#53

Code: Select all
`.............6......3.8.5.....3.2....28.9.47....8.5.....4.3.2......2..............6.4.2.3.7.......6..1.6.5..5.......9..6.3.7..2.......1..7.1.8..9.......3.5.7.3.1.`

#54

Code: Select all
`...573....3.....4....1.4...5.4.1.2.98..957..63.6.8.5.7...7.9....8.....9....845.............4..5..9...7.1.5............31.2.94............3.4.6...7..6..5..........`

enxio27

Posts: 447
Joined: 13 November 2007

### Re: Twin Sudoku? Help, please!

There must be a one-to-one correspondence between the digits of both boards, i.e., in all positions with a certain digit in the first grid, the corresponding positions in the second grid have to contain the same digit as each other (possibly a different digit from the digit in the first grid).

JasonLion
2017 Supporter

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Joined: 25 October 2007
Location: Silver Spring, MD, USA

### Re: Twin Sudoku? Help, please!

JasonLion wrote:There must be a one-to-one correspondence between the digits of both boards, i.e., in all positions with a certain digit in the first grid, the corresponding positions in the second grid have to contain the same digit as each other (possibly a different digit from the digit in the first grid).

So, are you saying that, for example, in the first grid of puzzle #53, R5C5 is 9 and in the second grid, R5C5 is 3, so that in every cell in the first grid where there is a 9, the corresponding cell in the second grid will be a 3? But that a 9 in the second grid will not NECESSARILY be a 3 in the first grid (in this case, a 3 in the first grid would be a 1 in the second grid, as in R3C3)?

enxio27

Posts: 447
Joined: 13 November 2007

### Re: Twin Sudoku? Help, please!

Yep.

JasonLion
2017 Supporter

Posts: 639
Joined: 25 October 2007
Location: Silver Spring, MD, USA

### Re: Twin Sudoku? Help, please!

Ahhh!! Now it makes sense! Why could they not explain all that in the first place?

Thanks for the help!

enxio27

Posts: 447
Joined: 13 November 2007

### re: "Twin Equivalent Sudokus"

the simple version
allows only re-mapping of digits
( as explained by JasonLion )

a trickier version
also allows re-mapping of lines within a chute

"Twin Equivalent Sudokus"

Pat

Posts: 3586
Joined: 18 July 2005

### Re: re: "Twin Equivalent Sudokus"

Pat wrote:

I remember that thread and discussion

tarek

Posts: 2675
Joined: 05 January 2006

### Re: re: "Twin Equivalent Sudokus"

tarek wrote:

I remember that thread and discussion