1-2-'21 Palindrome
(Published on 1. February 2021, 10:00 by Frans Wentholt)
Tattarrattat! It’s 1-2-’21, Palindrome Day!
For this occasion, my son Jurre and I created a Sudoku with two groups of digits: a square one with digits counting up from 1, and a circular one with digits counting up from 2. It also contains four (212) palindromes for this occasion. And there’s an Anti-Knight constraint in this Sudoku (no 2 squares which are a knight's move apart, may contain 1 and the same digit). Remember: a knight in chess moves 2 cells in one direction, and 1 in another - so that's appropriate for today!
Of course, normal Sudoku rules apply.
It could be a nice challenge using as few as possible pencil marks. Testing our Logical Path, Jurre and I only had to use them once, for a hidden pair (what symbolises 2), all other digits can be filled in immediately because they are hidden or naked singles (1's). Jurre and I exclaimed many times, in excitement: “Top spot!” (which is a palindrome).
For this occasion, my son Jurre and I created a Sudoku with two groups of digits: a square one with digits counting up from 1, and a circular one with digits counting up from 2. It also contains four (212) palindromes for this occasion. And there’s an Anti-Knight constraint in this Sudoku (no 2 squares which are a knight's move apart, may contain 1 and the same digit). Remember: a knight in chess moves 2 cells in one direction, and 1 in another - so that's appropriate for today!
Of course, normal Sudoku rules apply.
It could be a nice challenge using as few as possible pencil marks. Testing our Logical Path, Jurre and I only had to use them once, for a hidden pair (what symbolises 2), all other digits can be filled in immediately because they are hidden or naked singles (1's). Jurre and I exclaimed many times, in excitement: “Top spot!” (which is a palindrome).
Solution code: Row 1, Column 2
Last changed on on 2. February 2021, 11:31
Solved by cdwg2000, elikap, TroublesomeOrca, bigger, shudd, Fedo , Uhu, ManuH, ElimGarak, cfop, MajinXenu, Marcos, rcg, EliasKar, Danica, Raistlen, kroutu, SKORP17, NikolaZ, saskia-daniela, panthchesh, ... SudokuExplorer, RobertoMelo, lutzreimer, mlkj, zorant, flaemmchen, ParaNox, KatiBru, Miaocik, zrbakhtiar, OGRussHood, JJP, sorendipitous, Carolin, apendleton, PinkNickels, Crul, jalebc, finger
Comments
on 2. February 2021, 11:31 by Frans Wentholt
Edited a HTML error in the German text.
on 1. February 2021, 10:20 by cdwg2000
Happy Palindrome Day!
