Hidden Rectangle These solution algorithms use a classic "candidate-based" approach using an initial build of all candidate entries for each cell that is not initially filled by the input grid. Pointing and Claiming (Locked Candidates) 4. The program first tries to solve the input puzzle using solution algorithms including: 1. A grid has 9 rows, 9 columns and 9 boxes, each having 9 cells (81 total). the puzzle) is a partially completed grid. Most of the expert puzzles can be solved without resorting to the recursive search.
SUDOKU PUZZLE SOLVER FREE MANUAL
Since the displays come with micro-SD slots, I added some robot-themed cartoons for the idle display, the main menu, the configuration menu and the manual entry routine.
Solution progress is indicated and timed. One display shows the 9x9 grid and the other shows the progress made by algorithm application that either clears a candidate or places a solution in a cell. The solver has 24 built in puzzles with varying complexity and has a keypad with navigation tools for manual entry of your own puzzles.
I wanted to see how many of the algorithms I could research, 'computerize' and construct. There is complex logic for these algorithms, backed up by forcing-chain algorithms and, if all else fails, a 'smart' recursive descent/backtrack search that utilizes prior knowledge of candidates and cells with solutions.
There are many solvers that rely on brute force, but this solver uses most of the algorithms that actual people use. Each must contain 1-9 with no conflicts or duplication. Sudoku is a complex puzzle, comprised of a 9 x 9 cell grid divided into columns, rows and 3x3 blocks.
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