Differenz sudoku
(Published on 8. May 2009, 17:00 by Richard)
Solve online in CtC-app (thx Nick Smirnov!)
Solution code: row 1
Comments
on 15. October 2022, 05:57 by Richard
Added link and tag for online solving. Thx Nick!
on 10. October 2022, 21:44 by Nick Smirnov
CtC-app:
https://tinyurl.com/yr5r234d
on 10. October 2022, 21:44 by Nick Smirnov
@Richard, interesting variant. I don't think that you have created a sudoku with such ruleset in SVS, is this right?
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You are right about that; thanks for the notification. This puzzle is over 13 years old and by then it was a nice type. At this time, I am not so happy with the way the clues are presented; every possible number outside the grid has only one possible distribution of sums of negative and positive digits, which is a bit lame as I see it now. But maybe I'll let my thoughts go over a version with only the sum of the digits in coloured or white cells; it would be the addition-version of SVS024 Star products. Maybe I can make that work...
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Clues aside, the puzzle has very interesting and satisfying logical path, it didn't feel old at all. A good puzzle will always be a good puzzle.
on 28. September 2021, 23:59 by uvo_mod
Label ergänzt.
on 8. August 2009, 10:07 by Alex
As I not very often tend to leave a comment with those sudokus (though I really like them all a lot(except Killer3), just there is not that much to say really), this one here was a very nice variant indeed! :)
on 1. July 2009, 16:20 by Le Ahcim
Sehr schöne Sudoku-Variante. Ich war schon am Haare ausraufen, weil mein Lösungscode nicht angenommen wurde. Aber ohne die negativen Vorzeichen hat er dann doch gestimmt.
on 16. May 2009, 17:41 by Realshaggy
Zwei Fehlversuche wegen Rechenfehlern, danach glatt durchgekommen. Sehr schöner Lösungsweg ohne Fallunterscheidungen. Hab die erste Zeile erst gehabt, als der Rest eh leicht war, und kann auf meinem s/w-Ausdruck auch die grauen Zellen gut erkennen.
on 11. May 2009, 16:21 by Naphthalin
As far as I remember you could the first differenz sudoku very well.
on 11. May 2009, 15:12 by berni
Best for printing is, to use a 25% gray - #CCCCCC in HTML - (or a color that leads to 25% gray when converted to gray).
on 11. May 2009, 12:54 by Richard
@Naphtalin: I have chosen for yellow cells, because in the first differenz-sudoku I could hardly see the grey cells. But it's no problem to use another color in the future.
on 11. May 2009, 11:59 by Naphthalin
kleine bemerkung am rande an berni: beim SW-druck sieht man nahezu gar nichts von den gelben feldern...
on 9. May 2009, 08:13 by Richard
Thanks for the comments. While designing and improving the puzzles I tend to follow the same solving route, and in this case I always ended with rows 1 and 2. But I think it's a good idea, after having decided what the solution code must be, test-solve it once again, focusing on the solution code, to find out if it's quickly to find or not.
But you're right: the solution code is not the most important...
on 8. May 2009, 23:27 by r45
Danke Richard, wieder eine tolles Rätsel. Besonders der Start ist mir sehr schwer gefallen, danach war es (wie immer) nur noch schön.
Ich muss Uvo zustimmen, die erste Zeile war auch bei mir schon nach ca. 60% des Rätsels fertig. Aber das macht nichts. Wir haben doch alle den Ansporn, das Rätsel komplett zu lösen. Der Lösungscode ist im doch eher Nebensache.
Thank you, Richard!
on 8. May 2009, 21:14 by uvo
Vermutlich gibts verschiedene Lösungswege, ich hatte die erste Reihe jedenfalls lange bevor ich fertig war.
on 8. May 2009, 20:35 by Calavera
Die zahlen am Rand geben die Summen der jeweiligen Spalten/Zeilen an, wobei die Inhalte weißer Zellen positiv gezählt werden, die der gelben negativ. Der Lösungscode ist die erste Zeile.
on 8. May 2009, 20:33 by lutzreimer
Leider kann ich kein Wort englisch und "verstehe die Aufgaben von Richard in englisch nicht richtig
