There are three main differences:
- FIDE has finally adopted inclusive pronouns. "He" is replaced by "He/She". "Him" is replaced by "Him/Her", etc.
- The normal time penalty for illegal moves has been changed for rapid to bring it into line with blitz. It is now 1 minute instead of 2 minutes. The penalty for standard remains at 2 minutes.
- Recording the moves on a 'FIDE certified electronic scoresheet' has been introduced as an alternative to writing the moves on a paper scoresheet. The word 'record' is now also used instead of 'write'. e.g.
Article 8: The recording of the moves
8.1 How the moves shall be recorded:
8.1.1 In the course of play each player is required to record his/her own moves and those of his/her opponent in the correct manner, move after move, as clearly and legibly as possible, in one of the following ways:
8.1.1.1 by writing in the algebraic notation (Appendix C), on the paper ‘scoresheet’ prescribed for the competition.
8.1.1.2 by entering moves on the FIDE certified ‘electronic scoresheet’ prescribed for the competition.
There are additional minor typographical and grammatical corrections that don't affect the rules in any meaningful way.