2012-2013 XY-Summen-Schlangen Domino
(Published on 28. December 2012, 12:00 by Richard)
I wish all puzzle friends a happy 2013!
2012-2013 XY-Sums-Snake Domino
Place all the given domino tiles one time in the grid. The remaining cells form two XY-sums snakes. A snake may not touch itself or the other snake, not even diagonally. One snake consists of the X-sum 20, immediately followed by Y-sum 12, the other snake consists of X-sum 20, immediately followed by Y-sum 13. X- and Y-sums mean that you have to count X/Y cells to get to the sum. X and Y are the first digits of the first and second part of the snake.
Example for 2010-2011 XY-Sums-Snakes
Solve online in Penpa+ (thx Nick Smirnov!)
Puzzle:
Solution code: The number of horizontally placed dominos, row by row.
Comments
on 2. January 2026, 00:21 by isajo4002
I dont understand the example can you explain it more please
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Reply: sure! Be aware that the example is valid for 2010-2011. The left snake starts with 8, so X-Sum 20 adds the first 8 digits. Than the second X-Sum (in 2012 I called that Y-Sum to differentiate, but it is just another X-Sum) starts with 2 to add to 10 or 11, in this case the second digit is 9 to form 11.
The right snake starts with 5 and the first 5 digits add to 20 again. The second part of this snake contains 4 digits that add to 10.
For the actual puzzle it is important to find out which snake adds to 20 and 12 and which one adds to 20 and 13. And which cells are part of the regular domino puzzle.
on 30. October 2022, 07:02 by Richard
Added link and tag for online solving. Thx Nick Smirnov!
on 18. October 2022, 01:14 by Nick Smirnov
Penpa:
https://tinyurl.com/2fkcobq2
on 29. January 2014, 12:52 by flaemmchen
So, dann wünsche ich auch mal ein gutes 2013 und gleichzeitig alles Gute für 2014 ...
on 23. August 2013, 21:25 by cornuto
Lieber Richard, auch ich wünsche dir -ziemlich nachträglich- ein frohes neues Jahr. Das war ein tolles Rätsel, obwohl ich eigentlich Dominos weniger mag.
on 9. January 2013, 08:07 by AnnaTh
Super Rätsel! Aber ich hatte große Probleme, die Regeln mit den X/Y-Feldern zu verstehen.
on 2. January 2013, 00:40 by pin7guin
Vielen Dank für dieses wundervolle Rätsel! Lieber Richard, auch Dir ein gutes Jahr 2013!
on 29. December 2012, 05:54 by Richard
As usual, I am very much interested how solvers approached this puzzle. I have written some notes to the puzzle in a hidden comment. Do these notes sound familiar to those who tackled this puzzle?
on 29. December 2012, 00:57 by rimodech
happy new year!!!
