WebA Forcing Chain is actually a move simulator. Instead of placing a digit in a cell, we use the chain to find out what would happen when we make that move. "Forcing" refers to the … WebThe chain ends are 5 A7 and C2 - so all cells that can see both of these are under fire. It's possible to start at either end but lets follow the example from A7. We can reason as follows If A7 is 5 then A3/C7/C9 cannot be. if A7 is NOT 5 then it's 9, so A5 must be 2, which forces A1 to be 6. If A1 is 6 then C2 is 5.

Forcing Chains - Ironmonger

WebForcing Chain is the generic term for all types of chains and loops which propagate implications from one cell or candidate to another. People who are not accustomed to chains may find them intimidating at first. For a beginner, it is difficult to locate them in the grid and the question is often asked: "Where do I start?". WebExocet is a pattern that can often occur in very hard puzzles where the candidate density is very high. With few bi-value and bi-location candidates other strategies give up. Exocet … falls rate national benchmark

SudokuWiki.org - XY-Chains

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