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Tag Archives: Sudoku tools
The 2012 Akron Sudoku Tournament
I have to interrupt my review of forcing chains to celebrate the hugely successful, first time Sudoku tournament put on by my hometown Akron-Summit County Library. Upwards of 50 solvers enjoyed three 20 minute rounds, followed by an exhibition of … Continue reading
Posted in Basic Solving Procedures
Tagged box marking, pencil marks, solving trace, Sudoku tools, Sudoku tournament
2 Comments
Casting for Regular Fish
How do you spot regular fish? An effective radar is the set of markings that you saw in the blank lines of the “Complementary Swordfish” panel of the last post, repeated here: Looking from left to right, I marked the … Continue reading
Posted in Advanced Solving, Sudoku Toolware
Tagged finding fish, Sudoku fish, Sudoku tools, swordfish
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The Remote Pair – A Special XY-Chain
The remote pair comes your way with a blinking road sign. It is an XY-chain in which every bv along the chain contains the same two candidates, X and Y. The X and Y in the end cells are toxic. … Continue reading
Posted in Advanced Solving, Sudoku Toolware
Tagged Paul Stephens, remote pair, Sudoku tools, XY-chain
2 Comments
Riding the XY Rails
This post illustrates the complete enumeration of all XY-chains and toxic end pairs by drawing curves through the bv along XY-chain routes. XY-chains are then systematically divided into sub-chains with toxic ends. It’s a Sysudoku innovation. The puzzle is from … Continue reading
Posted in Advanced Solving, Sudoku Toolware
Tagged bi-value map, Megastar Maestro, Sudoku tools, XY railroad, XY-chain
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Suset Enumeration on Sue de Coq
This post demonstrates a systematic enumeration of subsets in the line marking of the Sue de Coq debut puzzle. More difficult units are resolved by the scratchpad suset algorithm introduced in the previous post of October 25, 2011. To checkpoint … Continue reading