Update README.md

README.md

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 <!-- Provide a quick summary of the dataset. -->
 ## Dataset Description
 
-3541 chess openings with their [Encyclopaedia of Chess Openings (ECO)](https://en.wikipedia.org/wiki/Encyclopaedia_of_Chess_Openings) classification.  
+3546 chess openings with their [Encyclopaedia of Chess Openings (ECO)](https://en.wikipedia.org/wiki/Encyclopaedia_of_Chess_Openings) classification.  
 
 ### Dataset Creation
 Creating this dataset is detailed in its original [GitHub repository](https://github.com/lichess-org/chess-openings).
 
-Updates to the original repo will also be reflected in this version. Dataset last updated on August 10th, 2025.
+Updates to the original repo will also be reflected in this version. Dataset last updated on October 7th, 2025.
 
 ### Dataset Usage