- Code: Select all
`17 17 6 | 8 5 4 | 9 3 2`

9 2 5 | 1 6 3 | 7 48 48

48 48 3 | 2 7 9 | 1 5 6

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34 6 8 | 459 1 7 | 35 2 359

347 47 2 | 4569 49 56 | 358 1 3589

5 9 1 | 3 2 8 | 4 6 7

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68 58 9 | 4567 34 2 | 356 47 1

16 15 7 | 456 348 56 | 2 9 3458

2 3 4 | 5679 89 1 | 568 78 58

I found a unique solution, but only by trial and error. Was there a logic approach that I missed?

Here's the catch: this is the upper right corner from the Samurai Sudoku published Mar 5. in the Washington Post. I solved the rest of the puzzle except for a few squares that depended on first solving the 9x9 above. All constraints from the rest of the puzzle are fully captured in the lower left 3x3 above (for instance, I know they're can't be an 8 in columns 1-3 of row H)....SO, assuming I haven't missed something, the above grid should be solvable by logic.

As an aside, is there a solver somewhere that lets you enter additional constraints? That is, one that starts the solution from a grid of candidates that you enter? The solver on this site rebuilds the candidate grid from the starting grid, I couldn't find a way to add additional constraints. This makes it less useful for solving individual 9x9 corners of samurai sudokus, since you can't include the info from the adjacent 9x9 blocks.

TIA,

-Stephen M