(and variations of both) This is perhaps the most important Sudoku solving technique that has ever been published! It cuts to the heart and soul of Sudoku puzzles. One of the rules of Sudoku puzzles is there can be only one answer to a puzzle. This technique is all about ensuring that you arrive at a unique answer … See more Gordonian Rectangle. Assume you are in the middle of a Sudoku puzzle and you find the situation similar to example 2 above (regardless if the blank cells are solved or not solved). Here is the theory … if the yellow … See more Example 3 is an actual puzzle in progress with the options for the unsolved cells printed at the top of those cells. Please examine the four … See more Let’s examine example 5 above. Note that there are 2 cells in each row, column and box! This is necessary to have a simple Gordonian Polygon. Assume you are in the middle of a Sudoku puzzle and you find a situation like … See more Though less common, this is a fun variation. Assume in example 4 that neither of the yellow cells is a 7. That would violate the single answer rule. Therefore one of the two yellow cells is a 7. Therefore, a 7 … See more WebTake two rows (the base sets). If you can find two columns, such that all candidates of a specific digit (the fish digit) in both rows are containd in the columns (the cover sets), all fish candidates in the columns that are not part of the rows can be eliminated. The result is called an X-Wing in the rows. If you exchange the terms rows and ...

Mensa Absolutely Nasty Sudoku Level 4... book by Frank Longo - ThriftBooks

WebAug 18, 2015 · In this blog, the Gordon Guide’s deceptive attempts to promote Gordonian logic are further exposed. The renaming of extended unique rectangles, and the introduction of a purported new method, the Gordonian Rectangle Wing, are debunked. While attributing extended unique rectangles … Continue reading → WebHidden Unique Rectangle Type 1 : Load Example or : From the Start. In Figure 1, the cells D3, D7, F3 and F7 (also known as DF37) form a rectangle with a potential deadly … fred bandy of princeton wv

Gordonian UR-ology Systematic Sudoku

WebMar 1, 2007 · Top solvers can try their hand at the One-Sided Gordonian Rectangle; Extended Gordonian Rectangle; Gordonian Polygon; and Alternating Digits. (But they … WebTop solvers can try their hand at the One-Sided Gordonian Rectangle; Extended Gordonian Rectangle; Gordonian Polygon; and Alternating Digits. (But they can take comfort in knowing that no more than one will occur in any single puzzle.) 80 Medium Sudoku Level 4. Author: J a Publishing,Ja Sudoku: Publsiher: Unknown: Total Pages: 102: blenheim palace tv