Speaking of XBetza (or rather, IBetza), you should really consider adding a link to your page on Extended Betza Notation to this page. Even if it is not strictly identical to the one used in the interactive diagrams it would be a very helpful edition. I did check for a link to that page before writing this, and I couldn't find one.
The new definition for t could be quite interesting. It also helps that kc covers the old function of t (excluding capture of royals).
Speaking of XBetza (or rather, IBetza), you should really consider adding a link to your page on Extended Betza Notation to this page. Even if it is not strictly identical to the one used in the interactive diagrams it would be a very helpful edition. I did check for a link to that page before writing this, and I couldn't find one.
The new definition for t could be quite interesting. It also helps that kc covers the old function of t (excluding capture of royals).