Some months before an official national tournament is held, there is an announcement of it which contains who can participate, some rules (e.g. no draw offers until the 30th move), etc.
Since I was going to participate in that tournament, I carefully read the announcement. One thing that caught my attention was that a player can't have the same colour for 3 continuous rounds.
Some months later, the tournament was held. In the last round, I played with Black and my opponent with White.
After the game, which I unfortunately lost, due to the lack of opening preparation, I realized that my opponent had taken White 3 times in the 3 last rounds. Playing with opposite colours was also impossible, since I had White 2 times continuously. In addition, I had played with most of the players which were up to the 10th position, so I couldn't find anyone else to play - maybe this is an exception?
As mentioned, I realized that after the round ended - thanks to chess24 for the colours. Was there anything I could do?
Lodging an appeal also came to mind that time. However, can the result actually be changed? Or should the game be replayed?
In addition, as I am not an arbiter, is there an option in Swiss Manager (the pairing program which was used to make the pairings) not to allow players get the same color 3 times continuously?
I have searched the FIDE Laws of Chess, especially the Article 7 about Irregularities, but I didn't find anything about what to do in such situations.
As a sidenote, this was a national tournament and I never expected that from an arbiter with the FA title, meaning that if I didn't find any satisfactory, I couldn't go any higher to find any...