The New Sudoku Players' Forum

[Hajime]

A Ninja is a 9-Sudoku Gattai, without corner subgrids.
An Anti-Knight is a Sudoku where digits can not repeat a chess knight's move away.
A Ninja that is Anti Knight

Puzzle can be solved with basic methods (naked/hidden subsets and pointing/claiming) and Anti-Knight restrictions.
In SiSeSuSo code:

Code: Select all

#9/AN/N4/H16/T16/B28/N28/Z28/H40/T40/N52
.6.....1..........7...3...6............972.........................9.............
..2...........1...8..6...........45...1.....8.8.5.........6.......8..............
......4.....9..........7..5.92......1.....3.......5.2.....1.........9............
..8...............3...............9..1.69..2........8.5...................4......
............................3.....2...........5.....6............................
......7...................4.1........4..78.5..5...............7...............3..
............7.........5.....8.5.......5.....4......16.7..3..........4.....8......
..............6.......5.........5.6.5.....3...29...........1..9...7...........5..
.............6.........................743............1...2...9..........6.....3.


This puzzle is symmetric and all overlapping areas are clueless.

[creint]

Not required to use sets, requires 2 layers of locked singles, only if your locked singles uses the anti-knight constraint.

[Hajime]

Not required to use sets, requires 2 layers of locked singles, only if your locked singles uses the anti-knight constraint.

Yes, you are right. The puzzle is meant for the autumn holiday for humans, not for computer solvers.
This one is much harder and possible not human solvable. Still symmetric across axis.

Code: Select all

#9/AN/N4/H16/T16/B28/N28/Z28/H40/T40/N52
..4...3......5..................................1.3..............................
..6.................5......71..............4.....4.......6.........9.............
......8.................1.........83.9...........5.........2.......7.............
.........3......................3....5...7.2......8............5.................
..............................7.2...............8.4..............................
.................9............4......1.7...6....9......................5.........
.............3.......2.........9...........5.17.........9.................1......
.............3.........6.......2.....8..............26......4.................3..
..............................5.4..................................1......7...5..