The New Sudoku Players' Forum

[David P Bird]

This a redrafting of the discoveries made by a number of contributors on the JExocet pattern made in the last two years. Most, but not all the findings have been gathered from the JE various threads, where by the nature of a discussion forum they are scattered and interspersed with side discussions of varying quality.

The work is presented as a series of 14 attached unprotected Open Office *.odt files. When opened, switch to web mode to turn off any pagination and adjust the zoom level if needed. The files aren't protected so once downloaded can be annotated and edited as required. We have all suffered the loss of reference pages on the web for various reasons and this approach should overcome that. If it is well received it could be extended to other subjects too.

Please consider how the subject has been handled more of a personal view rather than an official bible. Most of the original terms and treatments have been retained but those that didn't work so well (including many of my own) have been revised in an attempt to overcome their shortcomings. It is up to players to decide if these changes are improvements and are worth adopting or not, a path which should eventually lead to some form of consensus.

As I age, I'm aware that I can't maintain my concentration a subject for as long as in the past, and also that I've become more error-prone. That explains in part the time it's taken me, and also means I can't guarantee to respond quickly to any posts addressed to me. I apologise for any errors and omissions that have escaped proof reading.

Jason Lion informs me that document attachments to posts can be updated but the procedure is complicated and untested. This is why each document is contained in a different post. I intend to compile a list of any necessary factual corrections contributors spot and and implement them all together when they seem to be complete.

David PB

[David P Bird]

2. Junior Exocet Definition

02 Junior Exocet Definition v2b.odt

(28.81 KiB) Downloaded 1192 times

[Edits]
Mar? 2016 Version 2: Typos corrected, incompatible base pairs section revised following comments received, minor rewording elsewhere.
Wed Apr 13 2016 Version 2a elimination rule 7 revised, locked member sub-type section revised.
Sat Mar 18 2017 Version 2b further typos corrected and minor re-wording.
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[David P Bird]

3. JE and SK Loop Combination

03 JE and SKLoop Combination v3.odt

(27.04 KiB) Downloaded 623 times

The original version of this file was based on a false conjecture that the relationships described were common to all combined SK Loop /JE2 combination puzzles. This firstly led to a seriously flawed solution to the Easter Monster and secondly to inadequate definitions of the derived inferences.

This new file is a complete re-write to overcome these faults. The Easter Monster puzzle is a special case where the SK Loop has two almost JE2 patterns with a common base digit that are both true but without extensive branching this cannot be proved. This is now briefly covered in a separate section 7.

Thanks are due to Gordon Fick for proof reading the original and raising some awkward questions and to Leren for extracting a selection of source puzzles for checking my theories.

David PB

[Edits]
Thu Mar 19 2015 v1 Original
Fri Apr 15 2016 v2 Typos corrected, some wording changes, material re-ordered
Sat Mar 18 2017 v3 Major re-write to correct errors, specimen puzzle changed.
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[David P Bird]

4. Incompatible Base Pair Examples

04 Incompatible Base Pair Examples v2.odt

Version 2

(24.25 KiB) Downloaded 684 times

[Edit] Updated the copy of the revised description in the JE Definition file.

[David P Bird]

5. JE2 Examples

05 JE2 Examples v2a.odt

(23.32 KiB) Downloaded 742 times

[Edits]
Thu Apr 07 2016 V2 Typos corrected, examples 2 & 3 improved
Sat Mar 18 2017 V2a Further typos corrected
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[David P Bird]

6. JE+ Examples

06 JE+ Examples v2a.odt

(23.24 KiB) Downloaded 549 times

[Edits]
Thu Apr 21 2016 v2 Typos corrected, some re-wording and minor additions, further notes added to examples 2 & 3.
Sat Mar 18 2015 v2a Further typos corrected
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[David P Bird]

7. JE3 Examples

07 JE3 Examples v2a.odt

(22.56 KiB) Downloaded 532 times

[Edits]
Fri Apr 08 2016 V2 First Example Extended
Sat Mar 18 2017 V2a Typos Corrected
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[David P Bird]

8. JE4 Examples

08 JE4 Examples v2.odt

Version 2

(21.01 KiB) Downloaded 597 times

[Edit] Corrections: typos & faulty logic in Example 4, Examples solutions extended for #3 & #4

[David P Bird]

9. Almost JE Examples

09 Almost JE Examples v2a.odt

(24.66 KiB) Downloaded 533 times

[Edits]
Fri Apr 15 2016 v2 Minor wording changes, extra example 3b added
Sat Mar 18 2017 v2a Further re-wording
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[David P Bird]

10. JE2 / SK Loop Examples

10 JE and SK Loop Combination Examples v3.odt

(24.01 KiB) Downloaded 548 times

[Edits]
Fri Apr 15 2016 v2 Typos corrected, examples duplicated from description file removed.
Sat Mar 18 2017 v3 Re-written to correspond with version 3 of the main file (No 3).
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[David P Bird]

11. JE+ Extension Example

[David P Bird]

12. JE1 (Single Target) Example

[David P Bird]

13. JE (Locked Member) Examples

13 JE (Locked Member) Examples v2.odt

Version 2

(22.05 KiB) Downloaded 602 times

[Edit] Description revised, final example extended.
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[David P Bird]

14. Senior Exocet Example

[SteveG48]

David, I hope some day to understand all this. In the meanwhile- Thank you!