[Edit] Here are the new rules as of 2007/12/01.

Below, I left the initial rules in order for the readers to be able to understand what happened in the first patterns games.

A dealer gives a valid and minimal puzzle solved by singles only ("all singles")

This puzzle must have at least 19 clues, but less than 30.

Its pattern must be not isomorphic to a pattern already used in a previous game of this thread.

Each player can post a new valid puzzle provided that his proposed puzzle :

- has the same pattern
- is minimal
- is non isomorphic to any previous posted puzzle
- has a different ER rating from any previous posted puzzle.

Note : To use Sudoku Explainer for a file of puzzles, see this ravel's post.

In batch mode, SE gives 2 distinct ratings :

- 6.699999999999999 ; Hardest technique : Forcing X-Chain
- 6.7 ; Hardest technique : Bidirectional Y-Cycle

Each player can post 1 puzzle maximum for 1 day, except if somebody posts an other satisfactory puzzle.

The game ends if no puzzle has been posted for 3 days.

Points : when a puzzle is posted the player gets points = # posted puzzle.

i.e : the dealer gets 1 pt, next puzzle 2 pts, etc...

At the end of the game :

- a 20 pts penalty is given to the initial dealer
- a bonus for the last puzzle equal to the # puzzle
- the same bonus is given for the highest ER
- a 50 pts penalty for every post with an incorrect puzzle or for every edited (i.e. marked "edited") post

He loses his right if he doesn't propose any new puzzle within 1 day.

Initial rules

A dealer gives a valid and minimal puzzle solved by singles only ("all singles")

This puzzle must have at least 19 clues, but less than 30.

Each player can post a new valid puzzle provided that his proposed puzzle :

- has the same pattern
- is not an "all singles"
- has a higher ER rating than the preceding posted one.

If his puzzle stays unsurpassed for 1 week, he wins and gets the right to be the new dealer.

He loses his right if he doesn't propose any new puzzle within 1 week.

So let's start with this one :

- Code: Select all
`. . . | 6 . . | . . .`

5 7 4 | 1 . . | . 3 .

2 . . | . . . | 1 8 5

-------+-------+-------

. . . | . . . | . 4 .

. . . | . 5 . | . . .

. 1 . | . . . | . . .

-------+-------+-------

6 3 9 | . . . | . . 2

. 8 . | . . 9 | 5 7 6

. . . | . . 4 | . . .

23 clues, all singles, 12 steps

Any comments are welcome.

JPF