Czech Sudoku Championship 2020

HALAS - Czech Puzzle Association and Department of Mathematics and Statistics of the Faculty of Science, Masaryk University welcome everyone who is interested in sudoku and puzzle solving to the Czech Sudoku Championship 2020.

The Czech Sudoku Championship 2020 will be held over the weekend 5-6 September 2020 in Brno. The event will consists of the:

  • Czech Sudoku Championship 2020 - Individual Competition
  • Czech Sudoku Championship 2020 - Team Competition
  • Czech Junior Sudoku Championship 2020

To register for the Czech Sudoku Championship 2020, please fill in form HERE or contact the organizers.

Date: 5-6 September 2020, starting on Saturday at 10 a.m.

(from 10 a.m. to 2 p.m. on 6th September for them who will attend only the Czech Junior Sudoku Championship 2020)

Place: Department of Mathematics and Statistics of the Faculty of Science, Masaryk University
267/2 Kotlarska, 602 00 Brno

Preliminary championship schedule

5 September 2020

Saturday morning

  • 10:15 - 10:45 – Individual round 1
  • 11:00 - 12:00 – Individual round 2
  • 12:15 - 12:40 – Individual round 3

Lunch break

Saturday afternoon

  • 14:00 - 14:15 – Prize-giving for the Junior Championship
  • 14:25 - 15:05 – Individual round 4
  • 15:20 - 16:20 – Individual round 5
  • 16:35 - 17:10 – Team round 1
  • 17:25 - 18:00 – Team round 2

Evening attendee's meeting

6 September 2020

Sunday morning

  • 09:15 - 10:25 – Individual round 6
  • 10:40 - 11:30 – Individual round 7
  • 11:45 - 12:15 – Team round 3

Lunch break

Sunday afternoon

  • 13:30 - 14:45 – Individual play-off
  • 14:50 - 15:10 – Prize-giving


Czech Sudoku Championship 2020 - Individual Competition

Czech Sudoku Championship is open to everyone. Individual competition will take place in 7 rounds and play-off. Best players in categories Under15, Under18, Under21 and over50 will be honored given by the final ranking after 7 rounds. Top 7 competitiors of the final ranking will qualify into the play-off.

Final ranking for the play-off players will be given by its results. The top ranked Czech player will become the Czech Sudoku Champion. 

Czech Junior Sudoku Championship 2020

Junior Sudoku Championship is open to everyone born in 1999 or later. There will be 3 age categories in the competition - Under21 (for those born in 1999-2001), Under18 (2002-2004) nad Under15 (2005 or later).

Competition will take place in 3 rounds on Saturday morning (i.e. Individual rounds 1-3), attending juniors will solve together with other participants in the Czech Sudoku Championship. Competition booklet will be the same for all three categories as well as for all other competitors.

After prize-giving of the best juniors which will take place at the beginning of the Saturday afternoon session all juniors are more than welcome to continue competing throughout the rest of Championship programme.

Czech Sudoku Championship 2020 - Team Competition

Team competition at the Czech Sudoku Championship is open to everyone. Teams of 3 players will compete in 3 team rounds. Final team ranking will be given by team score achieved in 3 team rounds. Members of the best team will become the Czech Sudoku Team Champions.


General competition rules for the HALAS puzzle tournaments

(This is an extract of the General competition rules for the HALAS tournaments transcripted to English. Full version in Czech - 'Soutezni rad HALAS' - you can find here.)

Competition process

The organizer will announce in advance tournament schedule and special conditions.

The player must arrive on time, sign in at the registration desk and take a seat. The seat is either individual or the table is separated by a partition.

The organizer opens the competiton, subsequently introduces tournament rules, scoring system and person appointed as the tournament referee.

Prior to each of the competition round the organizer will announce time limit and time bonus for submission before the time limit. The organizer will distribute the competition booklets and make sure that puzzles are not visible before the start of the round.

During each individual round competitors must remain silent not disturbing other competitors. It is strictly forbidden to use any electronic devices.

The organizer keeps an eye on the time throughout the competition rounds, reminds competitors its remaining amount in a respectful way, and gives the signal when the time is over. After that, the competitor has to stop solving immediately, otherwise he/she may face disqualification.

If the player is sure that some puzzle has no solution within the given set of rules, he/she can get full credit of points by clear indicating that the puzzle is not valid next to it. If some puzzle has more than one valid solution, full points will be awarded for any solution that satisfies the given set of rules.

Booklets checking and dealing with protests

Players are asked for re-checking their competition booklets which were handed them out after the evaluation by the organizer. They are allowed to make an objection if they find their booklets evaluated incorrectly. The deadline for players’ objections is up to 10 minutes following the distribution of booklets from the last competition round.

If the protesting player is not satisfied with the verdict of the organizer, the matter will be passed to the tournament referee. The referee will decide either alone or is allowed to cooperate with a committee consisted of experienced players formed by himself/herself.

If the protesting player is not even satisfied with the verdict of the tournament referee, he/she can file a protest to the board of the  HALAS - Czech Puzzle Association. The board has to make a decision in 10 days and inform about it both the player and the organizer. If its decision affects tournament results, all players will be informed on the website of HALAS - Czech Puzzle Association.

Scoring and ranking

The cover page of the competition booklet should contain a list of puzzles in that round and their points distribution. The points value of each puzzle is also written next to the puzzle.

The tournament ranking is determined by the sum of points awarded for correctly solved puzzles in all rounds and bonus points for submission before the time limit.

If the competition is called in category A and B, the tournament ranking will be determined for both of them. Category A tends to be aimed at experienced players, whereas category B is intended for less experienced players and newcomers.