Clarification on FIDE Rating Calculation for End-of-Month Tournaments

Question

I 'm seeking clarification on FIDE rating calculations for tournaments held at the end of a month, particularly for blitz events.

Here's a specific scenario:

A FIDE-rated blitz tournament takes place on September 30th. Player A's September rating: 1400 Player A's October rating: 1600 (hypothetical significant increase) If calculated using September rating: Player A gains +50 points If calculated using October rating: Player A loses -75 points

The FIDE Title Regulations clearly state that for title norms, "The Rating List in effect at the start of the tournament shall be used." However, I'm uncertain if this applies to regular rating calculations for non-title events.

Questions:

1. Which rating (September or October) would FIDE use to calculate the rating change for this tournament?

2. Is there a specific regulation in the FIDE Rating Rules addressing this scenario for regular tournaments?

3. How does FIDE handle rating calculations when there's a significant rating change between the tournament date and the processing date?

I'd greatly appreciate any insights or references to official FIDE documents that clarify this situation.

Answer 1

Answers to your questions:

1 - FIDE considers the 30th and 31st too late to have time to update the rating for this month, so they defer it to the next rating cycle, which would be November the first. This means that FIDE would use the October Ratings to calculate the new rating. According to regulation 7.1.3: 7.1.3 The closing date for tournaments for a list is 3 days before the date of the list; tournaments ending before or on that day may be rated on the list. Official FIDE events may be rated on the list even if they end on the last day before the list date.

2 and 3 - There is no specific regulation, but I may have overlooked something. Here is the list of rating regulations according to FIDE: https://handbook.fide.com/chapter/B022024