-
Recent Posts
Recent Comments
Sudent on Krakening a Finned Fish Sudent on Beeby Carries UHC 223 to a Sec… Hildred on Krakening a Finned Fish Rachel Sheaffer on Beeby Carries UHC 223 to a Sec… Sudent on Sysudoku Sue de Coq Archives
- April 2021
- March 2021
- February 2021
- 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
Category Archives: Puzzle Reviews
Ultrahardcore Review ALS-wings II
The ultrahardcore ALS-wing survey continues with examples from UHC 47. The survey illustrates how ALS-wings are found as ALS are added to ALS maps. Continuing the survey into a second review puzzle UHC 47, the reward is this well laid … Continue reading
Posted in Heine, Puzzle Reviews
Tagged ALS AIC node, ALS death blossom, ALS-wings, building ALS-wings
Leave a comment
Continuing the Box ALS Scans for UHC 311
This post continues with the box to box, row and column scans for ALS_XZ. The C and S ALS fit into one red/orange cluster with a trap. The clusters meet in cell r7c8, showing that blue or orange or both … Continue reading
Posted in Heine, Puzzle Reviews, Sudoku Toolware
Tagged ALS box map, ALS map updates, ALS_XZ scanning
Leave a comment
Building ALS Maps With Suset Tables
This post displays the ALS map for rows of UHC 311, at the moment when the Beeby solver returned the first ALS_XZ. The suset ALS marking and building aid is introduced, and suset tables for rows, columns and boxes are … Continue reading
A Lite Update on Castillo’s Only Extreme 347
This post updates a solution by coloring trial in the review post of 12/19/17. A bypass of 6 4-fills resolves 3 of them immediately, but goes no further than the original 3-fill only bypass. Then we follow Beeby through a … Continue reading
A Lite Coloring Update of Castillo’s Only Extreme 261
This post is the first of several which update earlier review solutions to include a new guy in town, lite coloring. The earlier posts will be left as they are, except for added links to these updating posts. Instead of … Continue reading
Posted in Advanced Solving, Puzzle Reviews
Tagged Lite coloring, Manuel Castillo, Only Extreme 347, review update
Leave a comment
An Error Hides a Lite Coloring Trap on ultrahardcore 399
This post corrects an error on the post of December 8, that prevents a lite coloring trap in ultrahardcore 399. Then there’s follow up on the trap, with the lite coloring marking in place. Trial is not avoided, but the … Continue reading
Posted in Advanced Solving, Heine, Puzzle Reviews
Tagged Lite coloring, Stefan Heine, ultrahardcore review
Leave a comment
Pattern Trials Peel the UHC 487 Onion
The ultrahardcore review ends, with Stefan Heine’s 487 giving up a naked single and two skyscrapers, and a jaw dropping complex 1-way, shuts down the solver team. Slicing at it with three onion peeling pattern trials leaves very little for … Continue reading
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
Beeby Softens Up ultrahardcore 443
This post reports a series of Beeby ALS-XZ featuring alignments in Z and X, almost to the point where a trial is needed. A simple basic trace means a hard start, with a crowded grid. Sudokuwiki’s 579-wing is a Beeby … Continue reading
Posted in Extreme Solving, Heine, Puzzle Reviews
Tagged ALS-wing, ALS_XZ, complex 1-way, dfc boomer, Stefan Heine, ultrahardcore review
Leave a comment
Lite Coloring Informs a UHC 399 Trial
In one post, the 10th ultrahardcore review puzzle is wrapped, but not without an introduction of something new in Systematic Sudoku. Ordinarily advanced steps begin in line marking, and lite coloring is introduced. In line marking Stefan Heine’s ultrahardcore 399, … Continue reading