-
Recent Posts
Recent Comments
Sudent on Sysudoku Sue de Coq Gmamla on Sysudoku Sue de Coq Sudent on All Hands on Deck Against UHC… Gerald Asp on All Hands on Deck Against UHC… Sudent on Go Fish! Archives
- January 2021
- December 2020
- November 2020
- October 2020
- September 2020
- August 2020
- July 2020
- June 2020
- May 2020
- April 2020
- March 2020
- February 2020
- January 2020
- December 2019
- November 2019
- October 2019
- September 2019
- August 2019
- July 2019
- June 2019
- May 2019
- April 2019
- March 2019
- February 2019
- January 2019
- December 2018
- November 2018
- October 2018
- September 2018
- August 2018
- July 2018
- June 2018
- May 2018
- April 2018
- March 2018
- February 2018
- January 2018
- December 2017
- November 2017
- October 2017
- September 2017
- August 2017
- July 2017
- June 2017
- May 2017
- April 2017
- March 2017
- February 2017
- January 2017
- December 2016
- November 2016
- October 2016
- September 2016
- August 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- January 2016
- December 2015
- November 2015
- October 2015
- September 2015
- August 2015
- July 2015
- June 2015
- May 2015
- April 2015
- March 2015
- February 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- April 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- September 2011
Categories
- Advanced Solving
- Alary
- Barker
- Basic Solving Procedures
- Berthier
- Expert Reviews
- Extreme Solving
- Gordon
- Green
- Hanson
- Heine
- Hobiger
- KrazyDad
- Longo
- Monster
- Nakamoto
- Pitkow
- Puzzle Reviews
- Sheldon
- Sheldon
- Shortz
- Snyder
- Stephens
- Stuart
- Sudoku Toolware
- Sysudoku History
- Tom Sheldon
- Uncategorized
- Weekly Extreme
Meta
Tag Archives: hidden unique rectangle
SASdC Unlock UHC 443 for Beeby
After the hidden unique rectangle hinted last week, a pair of Single Alternate Sue de Coq trials gets the review solver Beeby moving again. ALS-wings and a finned X-wing get us to a colorful finish. The hidden unique rectangle left … Continue reading
An SASdC Trial Defeats ultrahardcore 355
In this post a SASdC trial plays like a regular hard puzzle from other collections. The trial amounts to adding two clues, and seeing what happens. But it isn’t guessing, and instead of making a small gain, the trial solves … Continue reading
Systematic FTSPAH 44 and 84
This post demonstrates two more FTSPAH unlikely to frustrate anyone following the Sysudoku order of battle. FTSPAH 44 begins with an unusually large number of givens, which generates a correspondingly large number of 3-fills. In fact, the givens offer both … Continue reading
Posted in Advanced Solving, Basic Solving Procedures, Puzzle Reviews
Tagged 3-fill, FTSPAH, hidden unique rectangle, XY ANL
Leave a comment
Lucky Panda 240 Rides Nice Loop Coloring
The candidates of a nice loop form a coloring cluster. This review puzzle from the Lucky Panda Sudoku review illustrates a decisive nice loop coloring. Two hidden UR 2 show up as well. After a productive bypass and box marking, … Continue reading
Only Extreme 304 is AIC Level
This post and the next update Castillo’s Only Extreme Sudoku review with a solution of OnEx 304 without trials. Most of the solution path is in AIC building, the most challenging level of Sysudoku Advanced. The only move prior to … Continue reading
Beyond the Rectangle
The alternative deadly uniqueness formations of the Sudocue Guide are detailed in this post. Also, there is a UR checkpoint on Sheldon’s Master Class # 3 that goes beyond the UR cases surveyed in recent posts. I can’t leave the … Continue reading
Posted in Advanced Solving
Tagged avoidable UR, bi-value grave, hidden unique rectangle, hidden UR, NUR, unique rectangle, UR
Leave a comment
Stuart’s Hidden UR
In Logic of Sudoku, Andrew Stuart describes a unique rectangle with only one bv corner. The tell-tale naked pair is not there. Stuart calls this formation a hidden UR, with good reason. You have to find the bv candidates in … Continue reading
Posted in Advanced Solving, Expert Reviews, Stuart
Tagged hidden unique rectangle, hidden UR, unique rectangle, UR
Leave a comment