To Whom It May Concern:

Here is an unsolicited patch that addresses some to do items in the Sudoku example:

1. The patch combines the two drl files into a single file, sudokuSolverValidatorWithGuess.drl, and separates them by using agenda groups.
2. It simplifies the checking of whether all possible cells have a solution by creating an object, basecell, for each cell that needs a resolved cell and introduces it into the memory space. A rule then checks baseCells against resolvedCellValues for the memory set.
3. Changes the way issues are raised by removing the issues array and adding various types of SudokuStatusMessages so that the status of the solution can be tracked by a separate status listener. This allows the model to track the status of solution.
4. Provides a solution to the rule 11 guessing rule. This is a little complex as the process is to identify a cell with multiple possible values and pick one of them and then run a copy of the solver to its logical conclusion and identify the result which is one of the following: solved, in error or indeterminate. The process is repeated until a solved solution is identified.
   Each pass keeps tracks the removal and insertion of memory facts so that they can be reversed at the end of the logical test. At the end of each test the effects of the test are reversed and one of the following is done depending on the result. If the test is indeterminate; keep testing. If the solution is solved; set the guessed cell value pair as the only possible value for the cell and run the base testing routines. If the solution is logically inconsistent; remove the cell value as a possibleCellValue, if this leaves only one possibleCellValue then run the base testing routines.
   Note, the error cases don’t necessarily solve the puzzle the end so sometimes you need to guess multiple times.
5. Changed the constants and samples into a strategy pattern that can support 4x4 and 6x6 grids as well as the 9x9 grid. This was done to simplify testing as it is easier to test an indeterminate 4x4 grid then a hard 9x9 grid when guessing.