Logic Masters Deutschland e.V.

Empty Chessboard

(Eingestellt am 10. Juni 2026, 06:30 Uhr von addie)

Standard 9x9 sudoku rules apply.

Antiknight and Antiking: Any two cells separated by a knight's or king’s move in chess cannot contain the same digit.

Ratio Kropki Dots: Digits separated by a black dot have a 2:1 ratio. Not all dots are necessary given.

XV: Digits separated by an X sum to 10, those separated by a V sum to 5. Not all Xs and Vs are necessarily given.

Solve on Sudokupad

Lösungscode: Row 2


Gelöst von jalebc, snuuba, slowbiex, OlafLemme, BellBear, RadchenkoAleksandr, SKORP17, dickey, sparkymanu, TheCutmaster, qmxqmx123, mariban, TaeChi, luuu, BenClancy, McMingus, by81996672, pms_headache, ... jadezki, strangelyinsane, Ryaffio, b413x, TroublesomeOrca, PippoForte, dogfarts, paintspotinfez, LLX, Jrosas, iEtsh, Fredneu, paranoid, ariesays, n99, SudokuHero, kangaroo, shadow-nexus, tjmas
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Kommentare

am 28. August 2026, 00:52 Uhr von tjmas
What a wild take from @iEtsh. "I couldn't figure it out so its a bad puzzle"

I thought it was a challenging and interesting break-in, but the rest was rather straightforward. 3* for the break-in alone for me

am 15. Juli 2026, 01:49 Uhr von paintspotinfez
Ended up having to do a bunch of bifurcation, but I'd REALLY be curious to know what the intended break-in is (in a hidden comment, so it doesn't spoil it for those who haven't completed it yet)

am 12. Juni 2026, 16:08 Uhr von superkinkel
This was absolutely brutal for me. While I know that the combined chess constraints force [spoiler], I am not able to explain/prove it myself, so decides to take that grind of narrowing down options to maybe learn. Took me an eternity and while I am glad, I made it, I'd still like to learn the proof.

am 11. Juni 2026, 00:07 Uhr von sparkymanu
I agree with BellBear, I think it's unfair to assume it's a bad puzzle because you can't find the break-in.
You are welcome to ask for help here or to search for miracle puzzles solves on Youtube to understand the solving path.

Anyway, nice puzzle @addie, thank you for submitting! I would actually rate it 2* on difficulty (assuming the solver being familiar with the ruleset)

am 10. Juni 2026, 15:43 Uhr von BellBear
@iEtsh: Just becauseyou didn't find a logical way to move forward, does not mean there ist none!

In fact, I found the break-in very satisfying, but from there on it was just filling in digits.

am 10. Juni 2026, 11:21 Uhr von slowbiex
tough break-in but very satisfying. thanks for setting

am 10. Juni 2026, 11:10 Uhr von iEtsh
A bad puzzle , has no logical steps to move forward, lots of bruteforces .. and still no way for progression

Schwierigkeit:3
Bewertung:85 %
Gelöst:41 mal
Beobachtet:1 mal
ID:000T83

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