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Difference between revisions of "Sudoku/Reviews/Systematic Sudoku/Nakex83"

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(Created page with "[https://www.sudokuwiki.org/sudoku.htm?bd=080070390060000001007300020009510002200000004600082900030005200800000010025090060 Raw puzzle in SW Solver]")
 
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This puzzle came from sysudoku.com.
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[https://sysudoku.com/2020/03/10/nakex-83-barn-storming-finish/ A Nakex 83 BARN Storming Finish]
 
[https://www.sudokuwiki.org/sudoku.htm?bd=080070390060000001007300020009510002200000004600082900030005200800000010025090060 Raw puzzle in SW Solver]
 
[https://www.sudokuwiki.org/sudoku.htm?bd=080070390060000001007300020009510002200000004600082900030005200800000010025090060 Raw puzzle in SW Solver]
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==Solution with [[Sudoku/Methods/Advanced/Simultaneous Bivalue Nishio|Simultaneous Bivalue Nishio]]==
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===First coloring===
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Some seed pairs with lower Gordonian cell number were examined and rejected. '''r5c5={36}''' looked better and some time was spent with it. A mutual resolution was found, but the coloring was then abandoned as not easily generating more results.[[File:NakEx2019 83-1.png|thumb|right|300px|SBN on r5c5={36}]]
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{{Standard coloring}}
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===Second coloring===
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The next seed pair was '''r2c3={34}'''. This found a contradiction in the 4 chain, hence '''r2c3=3''', and consequences.
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[[File:NakEx2019 83-2.png|thumb|left|300px|SBN on r2c3={34}]]
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===Third coloring:===
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'''r5c2={75}'''. Contradiction found in the 5 pair, so '''r5c2=7'''. Easy to the end.
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[[File:NakEx2019 83-3.png|thumb|right|300px|SBN on r5c2={75}]]
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'''[[:File:NakEx2019 83-4.png|Solution]].'''
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==Comments==

Revision as of 18:09, 17 March 2020

This puzzle came from sysudoku.com.

A Nakex 83 BARN Storming Finish Raw puzzle in SW Solver

Solution with Simultaneous Bivalue Nishio

First coloring

Some seed pairs with lower Gordonian cell number were examined and rejected. r5c5={36} looked better and some time was spent with it. A mutual resolution was found, but the coloring was then abandoned as not easily generating more results.
SBN on r5c5={36}

SBN coloring

  • light orange cell: seed cell for chaining
  • green: first chain. Convention: lowest digit or Gordonian cell number.
light green: alternate cell candidate within green chain.
  • red: alternate chain.
light red: alternate cell candidate within red chain.
  • purple: mutual elimination.
  • light purple cell: contradiction (multiple in region or empty in color)
  • light blue cell: mutual resolution (as only colored candidate in cell)

Second coloring

The next seed pair was r2c3={34}. This found a contradiction in the 4 chain, hence r2c3=3, and consequences.

SBN on r2c3={34}

Third coloring:

r5c2={75}. Contradiction found in the 5 pair, so r5c2=7. Easy to the end.

SBN on r5c2={75}

Solution.

Comments