your query is: # xyz wing sudoku strategy

XYZ-Wing - SudokuWiki.org

www.sudokuwiki.orgSudoku Strategy. XYZ-Wings extend Y-Wings to three numbers and are three cell formations used to eliminate candidate elsewhere.

Wings (XY-Wing, XYZ-Wing, W-Wing) - HoDoKu

hodoku.sourceforge.netSolving Techniques for sudoku - Wings (XY-Wing, XYZ-Wing, W-Wing) ... The possible candidates in that cell are called X and Y. Now we try to find two other ...

Solving Technique - XYZ Wings - Sudoku Snake

www.sudokusnake.comAn XYZ-Wing is like an XY-Wing in that it is a group of three cells, one sharing a unit with the other two. However, the first cell in an XYZ-Wing has three ...

XYZ-Wing Strategy - Sudoku Solving Techniques

www.sudoku.org.ukIt gets its name from the three numbers X, Y and Z that are required in the hinge. The outer cells in the formation will be XZ and YZ, Z being the common ...

Sudoku X-Wing Identification And Solution

www.sudokuessentials.comSudoku X-Wing can solve some of your most difficult Sudoku puzzles. This illustrative article will help you become a puzzle pro.

XYZ-Wing - Sudoku Solving Techniques

sudoku9x9.comXYZ-Wing ... The yellow cell XZ shares a common 3x3 box with the red cell XYZ and the green cell YZ shares a common row with the red cell XYZ. These three cells ...

Sudoku X-Wing technique: when and how to use

www.sudokuonline.ioRequirements to apply the Sudoku X-Wing strategy ... To be able to apply this technique, the player must find 2 rows or 2 columns where a single digit is a ...

X-Wings – Sudoku of the Day

www.sudokuoftheday.comSolving Sudoku : X-Wings ... X-Wings are fairly easy to spot, but a little harder to understand than some other techniques. Like others it relies on using ...

X Wing - Learn Sudoku

www.learn-sudoku.comAn X Wing is a technique for removing candidates (pencil marks). It starts with either two parallel rows or two parallel columns.

X-Wing Strategy - Sudoku - Thonky.com

www.thonky.comX-Wing is a strategy in which you find a candidate that appears twice in two different rows, and those appearances are both in the same ...

X Wing - Sudoku Beginner

www.sudokubeginner.comX Wing is an advanced sudoku technique, which means that the end result will not necessarily be finding the number that goes in a cell.

Solving Techniques 10- XYZ-Wing

nanpre.adg5.comThe XYZ-Wing is different from XY, in that three numbers are used. It is like the diagram below. When a problem turns out like this, a 3 will be entered ...

Sudoku XYZ-Wing Strategy explained

www.taupierbw.beXYZ-Wing ... Indeed, the "Three-Value" Cell and the two "Bi-Value" Cells form a group of three Cells with exactly three possible candidates, so their solution ...

Watch XYZ-Wing Solving Techniques - Sudoku Swami

sudokuswami.comIn an XYZ wing there are three cells and three candidates. It will have a configuration where one of the pincers will be in the same block as the pivot cell ...

XY Wing aka Y Wing Sudoku Ultimate Technique

www.livesudoku.comXY Wing (sometimes called Y Wing) is another advanced technique for eliminating candidates. It starts by finding a cell with only two candidates (a bi-value ...

Printable Puzzles by KrazyDad

krazydad.comThe following list of Sudoku Solving Techniques is based on a collection of tips ... Swordfish is on the same principle as X-wings, but extended to three ...

WXYZ-Wing - Solving sudoku strategy

www.sudoku9981.comIntroduce sudoku solving technique : The WXYZ-Wing is an extension of the XYZ-Wing, and is sometimes called XYZW-Wing. Seeing the extension of XYZ-Wing to ...

Sudoku Solutions, Advanced- X-wing, XY-Wing, Swordfish

www.puzzles-on-line-niche.comThese Sudoku solutions techniques are for the serious Sudoku addict! These are very involved tactics and require extensive knowledge of Sudoku puzzle ...

Sudoku Assistant -- Solving Techniques - St. Olaf College

www.stolaf.eduIn fact, though, X-wings and swordfish are simply two simple varieties of a much broader category of beast. A 5x5 circuit containing the candidate number "1" ...

Expert Sudoku Strategy XYZ-Wing Explained - YouTube

www.pinterest.comX-Chain , How to solve sudoku puzzles - Solving sudoku strategy. Introduce sudoku solving technique : X-Chain .The X-Chain technique and the Multi-Colors ...

Xy wing sudoku manual | Peatix

xy-wing-sudoku-manual.peatix.coma strategy all sudoku experts must know. these three cells form a xyz- wing pattern. this square is sometimes called a pivot or hinge. solving sudoku - xy- ...

100 Hard X-Wing Sudoku: Media, Clarity - Amazon.com

www.amazon.comPractice your advanced sudoku-solving skills with these 100 hard sudoku puzzles , all of which will require you to use the X-wing solving technique in order ...

XY-Wing: Advanced Solving Sudoku Technique

www.createclassicsudoku.comXY-Wing is a method used to refine the candiates of a square with multiple candiates. ... When one square with candidates {X, Y} is in the same row, column, ...

Irregular (W)XYZ-Wings : Advanced solving techniques

forum.enjoysudoku.comAs per my understanding, Irregular XYZ-Wings strategy is summarized as ... wings from what I understand from reading daily sudoku forums.

XY Wing - Sudoku Helper

sudoku.ironmonger.comThe XY Wing strategy uses three cells that contain two and only two candidates and have ... the XY Wing strategy is not related to the X Wing strategy.

Sudoku Solving Guide - SudoCue

www.sudocue.netWhen you check the pattern for a digit, you may spot a set of locked candidates, alongside an X-Wing. Chances are slim that you stumble ...

Sudoku Puzzles by using x-wing techniques

oaji.netThe purpose of this essay is to implement and study different techniques for solving Sudoku puzzles, a problem similar to graph coloring with.

Basic & advanced Sudoku elimination techniques to solve ...

humage.comLearn about solving Sudoku puzzles with various important techniques, such as X-Wing and Swordfish, all illustrated with clear pictures and detailed ...

Sudoku Fortschrittliche Lösungstechniken

www.janko.atX-Wing, Swordfish, Jellyfish, Squirm Bag, Turbofish, Finned X-Wing, Sashimi Finned X-Wing ... This strategy works in the other direction as well.

omerfarukeker/Sudoku-Solver - GitHub

github.comSolves the user entered Sudoku boards with commonly known strategies like hidden/naked pairs, X-wing, Y-wing etc. - GitHub - omerfarukeker/Sudoku-Solver: ...

Stuck at Sudoku? Here Are A Few Strategies To Get You ...

www.shawanoleader.comThis technique works with cells forming a rectangle, and it also occurs in rare situations. X-Wing is a pattern spanning multiple columns and ...

How to solve a Sudoku? - Telenet

users.telenet.beA XY-Wing or XYZ-Wing with all cells in a same unit, is a naked triple with the values {X,Y,Z}. The next example shows how different solving techniques can be ...

How To Solve Sudoku Puzzles

puzzlebooksplus.comLogic Techniques for Solving Sudoku ... You can use the X-Wing technique when a candidate number appears at all four corners of a rectangle, AND it is not a ...

XYZ - Wings - Speed Sudoku • View topic

www.speedsudoku.comThis is an extension of Y-Wing or (XY-Wing). John MacLeod defines one as "three cells that contain only 3 different numbers between them, ...

sudoku snake techniques

nkrafa.rtaf.mi.thSudoku X is played exactly the same way as the classic Sudoku, by filling in the numbers 1 through 9 in ... Sudoku Snake - Solving Technique - WXYZ Wings.

Finned X-Wing - Sudoku Solver

sudokusolver.appIn the sudoku diagram below, either in the R4C3 or R5C3 cells (marked in yellow) you can place the digit 6 or you have the X-Wing pattern, i.e. in the third ...

Please Give WXYZ Some Space | Systematic Sudoku

sysudoku.comMy early post on the regular XYZ-wing just passed “W” off as the rare ... with that in his Strategies page, presenting them as WXYZ-wings ...

Видео xyz-wing - imperiya.by

imperiya.byОнлайн — Видео xyz-wing — imperiya.by. ... Advanced Solving Sudoku Technique - X-Wing ... Advanced Sudoku Strategy X-Wing Explained. ▻. RFC963 5 год.

XYZ-Wing - SudokuWiki.org

www.sudokuwiki.orgSudoku Strategy. XYZ-Wings extend Y-Wings to three numbers and are three cell formations used to eliminate candidate elsewhere.

Wings (XY-Wing, XYZ-Wing, W-Wing) - HoDoKu

hodoku.sourceforge.netSolving Techniques for sudoku - Wings (XY-Wing, XYZ-Wing, W-Wing) ... The possible candidates in that cell are called X and Y. Now we try to find two other ...

Solving Technique - XYZ Wings - Sudoku Snake

www.sudokusnake.comAn XYZ-Wing is like an XY-Wing in that it is a group of three cells, one sharing a unit with the other two. However, the first cell in an XYZ-Wing has three ...

XYZ-Wing Strategy - Sudoku Solving Techniques

www.sudoku.org.ukIt gets its name from the three numbers X, Y and Z that are required in the hinge. The outer cells in the formation will be XZ and YZ, Z being the common ...

Sudoku X-Wing Identification And Solution

www.sudokuessentials.comSudoku X-Wing can solve some of your most difficult Sudoku puzzles. This illustrative article will help you become a puzzle pro.

XYZ-Wing - Sudoku Solving Techniques

sudoku9x9.comXYZ-Wing ... The yellow cell XZ shares a common 3x3 box with the red cell XYZ and the green cell YZ shares a common row with the red cell XYZ. These three cells ...

Sudoku X-Wing technique: when and how to use

www.sudokuonline.ioRequirements to apply the Sudoku X-Wing strategy ... To be able to apply this technique, the player must find 2 rows or 2 columns where a single digit is a ...

X-Wings – Sudoku of the Day

www.sudokuoftheday.comSolving Sudoku : X-Wings ... X-Wings are fairly easy to spot, but a little harder to understand than some other techniques. Like others it relies on using ...

X Wing - Learn Sudoku

www.learn-sudoku.comAn X Wing is a technique for removing candidates (pencil marks). It starts with either two parallel rows or two parallel columns.

X-Wing Strategy - Sudoku - Thonky.com

www.thonky.comX-Wing is a strategy in which you find a candidate that appears twice in two different rows, and those appearances are both in the same ...

X Wing - Sudoku Beginner

www.sudokubeginner.comX Wing is an advanced sudoku technique, which means that the end result will not necessarily be finding the number that goes in a cell.

Solving Techniques 10- XYZ-Wing

nanpre.adg5.comThe XYZ-Wing is different from XY, in that three numbers are used. It is like the diagram below. When a problem turns out like this, a 3 will be entered ...

Sudoku XYZ-Wing Strategy explained

www.taupierbw.beXYZ-Wing ... Indeed, the "Three-Value" Cell and the two "Bi-Value" Cells form a group of three Cells with exactly three possible candidates, so their solution ...

Watch XYZ-Wing Solving Techniques - Sudoku Swami

sudokuswami.comIn an XYZ wing there are three cells and three candidates. It will have a configuration where one of the pincers will be in the same block as the pivot cell ...

XY Wing aka Y Wing Sudoku Ultimate Technique

www.livesudoku.comXY Wing (sometimes called Y Wing) is another advanced technique for eliminating candidates. It starts by finding a cell with only two candidates (a bi-value ...

Printable Puzzles by KrazyDad

krazydad.comThe following list of Sudoku Solving Techniques is based on a collection of tips ... Swordfish is on the same principle as X-wings, but extended to three ...

WXYZ-Wing - Solving sudoku strategy

www.sudoku9981.comIntroduce sudoku solving technique : The WXYZ-Wing is an extension of the XYZ-Wing, and is sometimes called XYZW-Wing. Seeing the extension of XYZ-Wing to ...

Sudoku Solutions, Advanced- X-wing, XY-Wing, Swordfish

www.puzzles-on-line-niche.comThese Sudoku solutions techniques are for the serious Sudoku addict! These are very involved tactics and require extensive knowledge of Sudoku puzzle ...

Sudoku Assistant -- Solving Techniques - St. Olaf College

www.stolaf.eduIn fact, though, X-wings and swordfish are simply two simple varieties of a much broader category of beast. A 5x5 circuit containing the candidate number "1" ...

Expert Sudoku Strategy XYZ-Wing Explained - YouTube

www.pinterest.comX-Chain , How to solve sudoku puzzles - Solving sudoku strategy. Introduce sudoku solving technique : X-Chain .The X-Chain technique and the Multi-Colors ...

Xy wing sudoku manual | Peatix

xy-wing-sudoku-manual.peatix.coma strategy all sudoku experts must know. these three cells form a xyz- wing pattern. this square is sometimes called a pivot or hinge. solving sudoku - xy- ...

100 Hard X-Wing Sudoku: Media, Clarity - Amazon.com

www.amazon.comPractice your advanced sudoku-solving skills with these 100 hard sudoku puzzles , all of which will require you to use the X-wing solving technique in order ...

XY-Wing: Advanced Solving Sudoku Technique

www.createclassicsudoku.comXY-Wing is a method used to refine the candiates of a square with multiple candiates. ... When one square with candidates {X, Y} is in the same row, column, ...

Irregular (W)XYZ-Wings : Advanced solving techniques

forum.enjoysudoku.comAs per my understanding, Irregular XYZ-Wings strategy is summarized as ... wings from what I understand from reading daily sudoku forums.

XY Wing - Sudoku Helper

sudoku.ironmonger.comThe XY Wing strategy uses three cells that contain two and only two candidates and have ... the XY Wing strategy is not related to the X Wing strategy.

Sudoku Solving Guide - SudoCue

www.sudocue.netWhen you check the pattern for a digit, you may spot a set of locked candidates, alongside an X-Wing. Chances are slim that you stumble ...

Sudoku Puzzles by using x-wing techniques

oaji.netThe purpose of this essay is to implement and study different techniques for solving Sudoku puzzles, a problem similar to graph coloring with.

Basic & advanced Sudoku elimination techniques to solve ...

humage.comLearn about solving Sudoku puzzles with various important techniques, such as X-Wing and Swordfish, all illustrated with clear pictures and detailed ...

Sudoku Fortschrittliche Lösungstechniken

www.janko.atX-Wing, Swordfish, Jellyfish, Squirm Bag, Turbofish, Finned X-Wing, Sashimi Finned X-Wing ... This strategy works in the other direction as well.

omerfarukeker/Sudoku-Solver - GitHub

github.comSolves the user entered Sudoku boards with commonly known strategies like hidden/naked pairs, X-wing, Y-wing etc. - GitHub - omerfarukeker/Sudoku-Solver: ...

Stuck at Sudoku? Here Are A Few Strategies To Get You ...

www.shawanoleader.comThis technique works with cells forming a rectangle, and it also occurs in rare situations. X-Wing is a pattern spanning multiple columns and ...

How to solve a Sudoku? - Telenet

users.telenet.beA XY-Wing or XYZ-Wing with all cells in a same unit, is a naked triple with the values {X,Y,Z}. The next example shows how different solving techniques can be ...

How To Solve Sudoku Puzzles

puzzlebooksplus.comLogic Techniques for Solving Sudoku ... You can use the X-Wing technique when a candidate number appears at all four corners of a rectangle, AND it is not a ...

XYZ - Wings - Speed Sudoku • View topic

www.speedsudoku.comThis is an extension of Y-Wing or (XY-Wing). John MacLeod defines one as "three cells that contain only 3 different numbers between them, ...

sudoku snake techniques

nkrafa.rtaf.mi.thSudoku X is played exactly the same way as the classic Sudoku, by filling in the numbers 1 through 9 in ... Sudoku Snake - Solving Technique - WXYZ Wings.

Finned X-Wing - Sudoku Solver

sudokusolver.appIn the sudoku diagram below, either in the R4C3 or R5C3 cells (marked in yellow) you can place the digit 6 or you have the X-Wing pattern, i.e. in the third ...

Please Give WXYZ Some Space | Systematic Sudoku

sysudoku.comMy early post on the regular XYZ-wing just passed “W” off as the rare ... with that in his Strategies page, presenting them as WXYZ-wings ...

Видео xyz-wing - imperiya.by

imperiya.byОнлайн — Видео xyz-wing — imperiya.by. ... Advanced Solving Sudoku Technique - X-Wing ... Advanced Sudoku Strategy X-Wing Explained. ▻. RFC963 5 год.

X-Wing Strategy - SudokuWiki.org

www.sudokuwiki.orgSudoku Strategy. X-Wings are the simplest of the chaining formations and are very easy to spot. They use four cells in a rectangle to make ...

X Wing - Learn Sudoku

www.learn-sudoku.comAn X Wing is a technique for removing candidates (pencil marks). It starts with either two parallel rows or two parallel columns.

Sudoku X-Wing technique: when and how to use

www.sudokuonline.ioRequirements to apply the Sudoku X-Wing strategy ... To be able to apply this technique, the player must find 2 rows or 2 columns where a single digit is a ...

Basic Fish (X-Wing, Swordfish, Jellyfish) - HoDoKu

hodoku.sourceforge.netX-Wing ... Take 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 ...

X-Wings – Sudoku of the Day

www.sudokuoftheday.comSolving Sudoku : X-Wings ... X-Wings are fairly easy to spot, but a little harder to understand than some other techniques. Like others it relies on using ...

X Wing - Sudoku

www.livesudoku.comX Wing Tutorial · X Wing · It happens to be that those 4 cells (2 in each row) align up perfectly in the same two columns - column 5 and column 7. · This is called ...

X Wing - Sudoku Beginner

www.sudokubeginner.comX Wing is an advanced sudoku technique, which means that the end result will not necessarily be finding the number that goes in a cell.

Sudoku X Wing Technique with Examples

sudoku.com.auSudoku X Wing Technique with Examples · Consider any one candidate · Consider any two distinct rows · Let the candidate be limited to no more than two cells in ...

X-Wing Strategy - Sudoku - Thonky.com

www.thonky.comX-Wing is a strategy in which you find a candidate that appears twice in two different rows, and those appearances are both in the same ...

X-Wing - Rätselagentur Simon

www.thinkgym.deAm folgenden Beispiel möchten wir Ihnen eine Situation erläutern, in der wir die Sudokustrategie des X-Wing anwenden. Die schwarzen Zahlen sind die ursprünglich ...

Solving Technique - Finned X Wings - Sudoku Snake

www.sudokusnake.comA Finned X-Wing is a pattern that is one cell short of being an X-Wing - in other words, two columns that contain a candidate in only two rows, ...

Sudoku Strategy. X-Wings are the simplest of the chaining ...

www.pinterest.co.ukX-Wing Strategy. Sudoku Strategy. X-Wings are the simplest of the chaining formations and are very easy to spot. They use four cells in a rectangle to make ...

Sudoku Puzzles by using x-wing techniques

oaji.netWith many advanced techniques, the key is to spot patterns within your pencil marks to eliminate possibilities within other squares. The x-wing technique:.

Sudoku Solving Techniques

www.sudoku.org.ukY-Wing Strategy. This is an excellent candidate eliminator (and is also known as XY-Wing). The name derives from the fact that it looks like an X-Wing - but ...

X-Wing - Sudoku Solving Techniques

sudoku9x9.comX-Wing ... If a digit is a candidate for exactly two cells in two different rows and the positions (columns) of those two cells in those two different rows are ...

Sudoku Help - X-Wing - BrainBashers

www.brainbashers.comAn X-Wing is a advanced technique which can eliminate certain candidates from squares. Its name comes from the pattern formed by the digits. We are looking for ...

Sudoku X Wing Practice - Advanced Sudoku Strategy Finned ...

jorjabartlett.blogspot.comSudoku Puzzles By Using X Wing Techniques Logic Teaching Mathematics from imgv2-1-f.scribdassets.com This strategy is looking at single numbers ...

Sudoku Solutions, Advanced- X-wing, XY-Wing, Swordfish

www.puzzles-on-line-niche.commentioned solution types. X-Wing. To solve Sudoku puzzles using this process, one must have recognition of number relationships.

X-Wing Sudoku Solving Techniques

sudokuswami.comThe X-wing pattern appears in tricky sudoku puzzles when two rows or columns contain just two cells that hold matching candidates.

Sudoku Sashimi Finned X-Wing Strategy explained

www.taupierbw.beSudoku strategies explained with graphics. ... Sashimi Finned X-Wing. If a particular candidate is present in only two Cells in a Row and if you can find ...

X-wing (Sudoku) - — Wikipédia

fr.wikipedia.orgLa méthode X-Wing est une technique de résolution de Sudoku. Son nom provient des X-wing de Star Wars, le X fait référence à la disposition des cases ...

X-Wing - Solving sudoku strategy

www.sudoku9981.comIntroduce sudoku solving technique : An X-Wing is a fish pattern involving 2 rows and 2 columns.It is a single-digit solving technique that allows the ...

X Wing and Other Fishy Things - Sudoku Helper

sudoku.ironmonger.comSudoku Helper - HowTo for Sudoku solving technique fishyThings. ... The X Wing strategy looks for two rows that only have two instances of ...

This Sudoku Actually Teaches The X-Wing Technique!

iam.t-rkr.deThis Sudoku Actually Teaches The X-Wing Technique! Upload: 29 10 2020 10:07. Tags: sudoku. Source Gelöst in 59:49 ...

raphael-kahler/SudokuSolver: Apply common sudoku solving ...

github.comSudoku Solver. A solver for Sudoku puzzles that uses common solving techniques. The solver shows for every step which technique was used, so you can follow ...

Sudoku difference between x wing and double pair - Puzzling ...

puzzling.stackexchange.comDouble Pairs and X Wing are listed as different techniques here (former is a medium and later a master technique). The only difference I can see ...

Su Doku puzzle needing x Wing technique, can anyone help?

forum.enjoysudoku.comI was recommended to use X Wing which I am totaly unfamiliar with. I looked at SadMan Software ... http://www.sadmansoftware.com/sudoku/.

Sudoku Puzzles 129 - Associated Pairs, X-Wing

www.sudoku129.comSolving methods > 4- Complex methods > 4.1 Associated pairs (X.wing). The following methods are not necessarily more difficult to understand that the above ...

How to solve hard Sudoku puzzles

minimindgames.comHere are the most common techniques to solve hard Sudokus. X-wing. X-wing. If a candidate appears in two columns (rows) in exactly ...

JSudoku - Fishes & Single Digit Techniques

jcbonsai.free.frThis is a generalization of the X-Wing, Swordfish, Jellyfish which is more frequent is some variants like Diagonal Sudoku. It is based on strong links and uses ...

Sudoku Puzzles by using x-wing techniques - Academia.edu

www.academia.eduInternational Journal of Computer TechniQues - Volume1 Sudoku Puzzles by using x-wing techniques Dr. Zubair Khan1, Ashish Kumar2, Sunny Kumar3 M.Tech ...

X-Wing - Sudoku technique

www.free-sudoku-puzzle.netAn X-Wing can also occur on 3 rows or columns instead of 2. This is called a SwordFish. Install Free-Sudoku-Puzzle as an app.

How to solve a Sudoku? - Telenet

users.telenet.be5. X-Wing. When there are only two possible cells for a value in each of two different rows, and these candidates lie also in the same ...

Solving Sudoku - Angus Johnson

www.angusj.comRules and hints for solving Sudoku puzzles. ... The X-Wing and Swordfish techniques can be further generalised to include rows containing candidates ...

Sudoku Solving Techniques - Kristanix Games

www.kristanix.comTips on Solving Sudoku Puzzles - Sudoku Solving Techniques ... X-Wing. This method can work when you look at cells comprising a rectangle, such as the cells ...

Sudoku Assistant -- Solving Techniques - St. Olaf College

www.stolaf.eduOther advanced techniques are required to solve more difficult Sudoku puzzles ... (An X-wing is really a naked pair; a swordfish is a naked triple, etc.) ...

Sudoku Strategy Tips, Tutorials and Videos

www.eadvancedsudoku.comWith step-by-step Sudoku strategy tips, tricks and video tutorials. ... The X Wing method is a way to help you solve very hard Sudoku puzzles!

Aftermath of October 31 meeting - UCI Math

www.math.uci.eduA Practice Sudoku Puzzle (from "Enjoy Sudoku" LEARN X-Wing) (image1) ... A puzzle solvable using only basic techniques (Puzzle 71 in Chapter 7 of Gordon) ...

Sudoku techniques - Conceptis Puzzles

www.conceptispuzzles.comThe X-Wing technique is used in rare situations which occur in some extremely difficult puzzles. Scanning column a we see that 4 can only be in square a2 or ...

X Wing 数独Sudoku - 程序猿

www.wjhsh.netAn X Wing is a technique for removing candidates (pencil marks). It starts with either two parallel rows or two parallel columns. Blocks are not involved here.