motris (motris) wrote,
motris
motris

Friday Puzzle #167 - US Sudoku Qualifier - Irregular and Non-consecutive Sudoku

Congrats to the qualifiers for the US Sudoku team: Jonathan Rivet, Jason Zuffranieri, and new team member Joshua Zucker.

This year's US sudoku qualifier again featured two parts: one with regular sudoku and "classic" variations, and another with less common variations and new styles. This week I will share two of the harder "classic" variations that I wrote for the test, an Irregular Sudoku and a Nonconsecutive Sudoku.

The Irregular's theme developed out of the central cage geometry, extending the pattern with givens when the the regions could no longer follow. It has a bunch of stall points, and requires several different strategies to complete, so it certainly deserves the high point value it received.

The Nonconsecutive built off a less common symmetry for sudoku but with a choice of positions that really works well with a nonconsecutive puzzle to maximize interactions with adjacent cells at the start. It too has a couple transitions in approach which makes it a longer solve than usual.

Irregular
Rules: Place a single digit from 1 to 9 into each cell so that no digit repeats in any row, column, or bold region.



Non-consecutive
Rules: Place a single digit from 1 to 9 into each cell so that no digit repeats in any row, column, or bold region. Additionally, no pair of consecutive digits can be placed in vertically or horizontally adjacent cells.



Solutions:
Irregular
Non-consecutive
Tags: competition, fridaypuzzle, sudoku, ussc
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