![]() The notation follows spreadsheet conventions (column = letter, row = number) (or chess if you will). (I use my own home grown unoptimized python program, so there is no real computing power involved either). ![]() However, it does not require any fancy algorithms to follow it. ![]() Just following the chain including contradictions requires to solve 23 variants of the sudoku, so it's best used with a computer aided solver. So, here is a reasoning chain based on a breadth-first hypothesis/disproof method (which my stepson reluctantly calls "educated guessing"). Guessing single values in a depth-first search is sub-optimal.
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