Round Robin Tournament Scheduling

Recent Posts

1
Requests / Re: 15 Teams 10 Tables Billiards
« Last post by Patrick0595 on Today at 09:49:00 AM »
Ian,  

Very nice work! The schedule appears to work perfectly!

Thank you!
Pat
2
Requests / Re: 15 Teams 10 Tables Billiards
« Last post by Ian Wakeling on Today at 03:49:16 AM »
The spreadsheet should do what you want, just select "Do not randomize" from the drop down list, and then "Home/Away", "Double Round Robin" and 15 teams.  It is easier to see the complementary H/A pattern if you uncheck the "multi-tab" checkbox.
3
Requests / 15 Teams 10 Tables Billiards
« Last post by Patrick0595 on Today at 12:26:56 AM »
Hello, I think I found the right place for this.  I have a 15 team pool league with 10 locations in a 30 week season.  Each team will play every team once at home or away in the first half and away or home in the second half.  I downloaded the Ian balance spread sheet and just clicking away at the generate button trying to find the perfect fit.  A and B can't be home on the same night but they can be home/away against each other.  Any help would be greatly appreciated.

A-B Same Venue
C-D Same Venue
E-F Same Venue
G-H Same Venue
I-J Same Venue
K
L
M
N
O

4
This is perfect! I wasn't sure there was an easy way to make this work nicely. 

Thank you so much for your help!
5
Requests / Re: 10 Team / 2 Venues (2 courts per venue) - Five Playing Dates - HELP
« Last post by Ian Wakeling on September 15, 2019, 04:36:32 AM »
There will be 15 unused slots in the schedule, since there are 60 available but only 45 games in the round-robin.  If a team has only one game at a venue, then there must also be another team with only one game, and in such cases there are only 4 games to be played, meaning that one of the time slots is not required. In all other cases there will be 5 games at a venue as this gives each of the 5 teams scheduled to travel there exactly 2 games each.  I hope the solution below is useful to you (also attached in Excel format) - you need to be logged in to see the image and attachment.
6
Requests / 10 Team / 2 Venues (2 courts per venue) - Five Playing Dates - HELP
« Last post by HWDSB Athletics on September 14, 2019, 02:07:10 PM »
Hi,

Looking for some help.  Struggling with coming up with a round robin format which sees the following parameters. 

- 10 teams
- 2 different venues + 2 courts per venue - over 5 weeks (teams cannot travel between venues, but each venue has 2 courts with 3 time slots each) - total 12 games per night (6 per venue) can be played
- Teams should play 2 times per night (however given it's 9 games per team - they would get one week with just a single game)

Does someone have a suggestion to make this work.  I'm confusing myself as I get into my later rounds.

7
Requests / Re: 8 Teams 10 Games
« Last post by Ian Wakeling on September 14, 2019, 04:06:13 AM »
It is possible to make it work with 8 teams (A to H).  In the following every team has played each other team once when the 7th round (row) is complete, so the repeated matchups are all in the last three rows.

(---) (G A) (---) (D H) (---) (E F) (---) (B C) (---) (---)
(---) (---) (C D) (---) (E A) (---) (H F) (---) (B G) (---)
(---) (---) (---) (B E) (---) (C H) (---) (F A) (---) (D G)
(B D) (---) (---) (---) (C F) (---) (E G) (---) (H A) (---)
(---) (E C) (---) (---) (---) (D A) (---) (H G) (---) (B F)
(C G) (---) (E H) (---) (---) (---) (B A) (---) (D F) (---)
(---) (B H) (---) (G F) (---) (---) (---) (E D) (---) (C A)
(H F) (---) (B A) (---) (G D) (---) (---) (---) (E C) (---)
(---) (F D) (---) (A C) (---) (G B) (---) (---) (---) (E H)
(E A) (---) (G F) (---) (H B) (---) (C D) (---) (---) (---)

I cannot see any nice solution for 9 teams, because of the odd number of teams, the byes and the impossibility of giving teams the same number of games.  It's better to avoid the problem somehow.
8
Requests / 8 Teams 10 Games
« Last post by annagram on September 12, 2019, 04:48:10 PM »
Apologies if this is already out there--I couldn't find it. 

I organize a Lawn Games Decathlawn every year, with 10 games, but this year we only have 8 teams. I'm trying to figure out how to make a fair schedule. All teams should play each game once. All teams should also play each other team at least once, though with only 8 teams, I know some matchups will be played twice. 

We might also end up with 9 teams, which I assume means each team will end up with a bye round due to the odd number of teams. 

Help?
9
Requests / Re: 7 players, tripple play
« Last post by Ian Wakeling on September 10, 2019, 03:19:05 AM »
Hi Klaus,

There is a simple cyclic solution to this, so given the first round, the other rounds are formed just by rotating through the players in order.  For example:

                  Bye
(1 2 4) v (3 5 6)  7
(2 3 5) v (4 6 7)  1
(3 4 6) v (5 7 1)  2
(4 5 7) v (6 1 2)  3
(5 6 1) v (7 2 3)  4
(6 7 2) v (1 3 4)  5
(7 1 3) v (2 4 5)  6

Ian
10
Requests / 7 players, tripple play
« Last post by Bakdal on September 09, 2019, 08:11:58 PM »
Hi there.

I am sure it's simple, but still:

A schedule for seven players, playing seven games in tripples. That should add up to all players playing together two times, and against each other three times.

Could you make a scheme?

Thanks in advance,

Klaus