Tag Archives: Sudoku BARN

A BARN Storming UHC 353 Finish

Posted on December 7, 2021 by Sudent

This posts finishes left page ultrahardcore 353, using several notable moves to expand a cluster. Sudokuwiki starts it with a grouped terminal ANL with line and box winks, a regular swordfish expands the cluster, trapping four candidates. Expansion creates an … Continue reading →

Posted in Advanced Solving, Puzzle Reviews, Heine | Tagged XYZ-wing, swordfish, Sudoku BARN, Sudoku 3-BARN, grouped ANL, Medusa coloring wrap, coloring traps, ultrahardcore review, Stefan Heine | Leave a comment

Nakex 183 Hides the Keys

Posted on April 21, 2020 by Sudent

The last review puzzle, Nakamoto Extreme 183, follows the collection’s pattern of hiding easier removals behind methods that are very difficult to spot. An effective defense is to maintain bv maps, X-panels, and coloring clusters carefully as more advanced results … Continue reading →

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged ALS APE, confirming ANL by bv boomer, grouped X ANL, hidden UR 1, J.B.Nakamoto Extreme, Sudoku BARN, WXYZ-wing | Leave a comment

Nakamoto Extreme 123 Is, Briefly

Posted on March 31, 2020 by Sudent

Nakex 123 limps into AIC building briefly, then succumbs to Sudokuwiki XY chains, simple coloring traps, a coloring bridge and an outstanding BARN. Here is the grid at the end of a bypass exceptional among Nakamoto Extreme puzzles. The slink … Continue reading →

Posted in Advanced Solving, Extreme Solving, Nakamoto | Tagged ALS bv boomerang, bypass, coloring traps, J.B.Nakamoto Extreme, Sudoku BARN, XY wraps, XY-chains, XYZ-wing | Leave a comment

Sudokuwiki’s Nakamoto Extreme 103

Posted on March 17, 2020 by Sudent

After Sysudoku Basic, this post describes the Sudokuwiki advanced and AIC solution path on Nakex 103. The next post reports an alternative path shortened significantly by a freeform pattern analysis. Nakex 103 starts a little differently, with some bypass success: … Continue reading →

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged AIC boomerangs, AIC confirming ANL, AIC nice loop, APE, boomer wrap, digit forcing chain, hidden UR type 2b, J.B.Nakamoto Extreme, LM X-wing, Sudoku BARN, XYZ-wing | Leave a comment

A Nakex 83 BARN Storming Finish

Posted on March 10, 2020 by Sudent

This post details the unusual finish of Nakamoto Extreme 83, with three more interdependent BARN’s, well assisted by Medusa coloring. From the first cluster trap and BARN, further expansion and the aligned triple continue to move Nakamoto Extreme 83 towards … Continue reading →

Posted in Advanced Solving, Nakamoto, Puzzle Reviews | Tagged J.B.Nakamoto Extreme, Shortcut ANL, Sudoku BARN | Leave a comment

A Nakex 83 BARN Challenge

Posted on March 3, 2020 by Sudent

Nakamoto 83 earns its Extreme badge by an extremely tough Basic, and resistance to anything short of AIC building. It ends with an expanding cluster, accelerated by a series of BARNs. This post brings you to the first one, and … Continue reading →

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged AIC ALS nice loop, boomer confirming ANL, J.B.Nakamoto Extreme, Sudoku BARN, XY ANL | 8 Comments

Sudokuwiki Ends Nakex 63 On Its Own

Posted on February 25, 2020 by Sudent

This post picks up on the Sudokuwiki/Sysudoku resolution of Nakamoto Extreme 63 where it was overtaken by pattern analysis and coloring, and finishes it in two ways, one humanly practical and one not. Sudokuwiki doesn’t maintain coloring clusters between moves, … Continue reading →

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged AIC ANL, AIC nice loop, ALS toxic pair, APE, cell forcing chains, hidden UR type 2, J.B.Nakamoto Extreme, Sudoku BARN, UR strong link | Leave a comment

Reviewing a Truly Extreme Collection

Posted on January 14, 2020 by Sudent

This post and the next initiate a review of Sudoku Puzzle Book, Extreme Level by J. B. Nakamoto, with Nakex 3. The review combines moves by Andrew Stuart’s Sudokuwiki solver with Sysudoku alternatives, while reporting and interpreting moves in accordance … Continue reading →

Posted in Advanced Solving, Puzzle Reviews | Tagged grouped ANL, hidden UR type 1, J.B.Nakamoto Extreme, spotting boomerangs, Sudoku BARN, UR type 4 | Leave a comment

Super Fiendish Bookends 67 and 77

Posted on December 31, 2019 by Sudent

This post steps through the most fiendish of the 10 puzzles preselected for the review of Brian Challenger’s Super Fiendish Sudoku, SF 67. , and then adds one of the bypass victims, SF 77. Looking at the trace, you might … Continue reading →

Posted in Advanced Solving, Basic Solving Procedures, Puzzle Reviews | Tagged APE, Brian Challenger, hidden UR type 2b, iXYZ-wing, nice loop coloring, Sudoku BARN, Super Fiendish Sudoku, Sysudoku XY Railway | 10 Comments

Metcalf’s Second Patterns Game Entry

Posted on November 26, 2019 by Sudent

This post reports a Sysudoku solution path for Mike’s second Patterns Game entry on a extraordinary pattern of givens. As a successful entry, I believe it had to meet the contest requirement for a simpler solution than is found here. … Continue reading →

Posted in Advanced Solving | Tagged grouped AIC boomerang, hidden UR type 1, Sudoku BARN, the patterns game | Leave a comment

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