It's all Graeco-Latin To Me...Most people will not have encountered Graeco-Latin sudoku before. The reason for this is that it is not commonly seen in print.
Whilst the concept of having one value in each cell is pretty much sacrosanct with sudoku, that rule is broken here, and there is a number and a letter in each cell.
However, for those who are experienced sudoku solvers, this will not prove too much of a jolt, and the same rules as for sudoku can be applied to the letters and numbers individually and some progress can be made this way.
To solve these puzzles however you will invariably need to take note of the fact that each combination of letter and number is unique, so with a 5 x 5 puzzle the 25 combinations from A1 through to E5 appears exactly once.
This fact introduces some nice logic, at the simplest level one has already placed 'B1' and have four other cells that contain a 'B' but you have no idea as to their value, then you can eliminate '1' as an option from each of those cells since that combination has already been placed in the grid.
Graeco-Latin sudoku are sometimes called ABCDoku or Greek Latin sudoku.
These puzzles are typically published at a much smaller size than 9 x 9 and 5 x 5 is the most common. That's because having to keep track of 81 unique combinations can become quite tedious, so these puzzles are at their best at around the 5 x 5 size.
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Last updated: 16 Feb 2012
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