T-Precision stands for Transfer Precision. My goal in this version is to bring T-Precision more in line with Meck-Lite Precision and with the ACBL bidding charts coming in to effect in November 2018. Also, I want to make changes I have come across playing Swedish Precision and other forms of Precision. The changes to the new charts do not affect Precision substantially. Most everything is legal on the Open and Open+ charts, the main exception is Multi 2D which is still restricted. On the Basic+ there are restrictions but for the most part Precision is exempted from the restrictions and has an unfair advantage over more standard methods.
The biggest change is the 1D and 2D bid. The 2D bid is now Mexican (19-20 hcp balanced) so 1D can be a three-suiter with 0+D. Often a 1D opener is looking for a fit opposite a 4-card major. 2C still promises 6+C so 1D will include hands with 5C and a 4-card major but will treat these hands as balanced when possible. The responses to 1C have been modified to include 1H=8-11 hands except for those with 5+ spades (1S) and 5+H and 5+m (2H). So relays are usually with 12+ hcp hands.
The standard limited openings 1D, 1H, 1S, 2C can now be opened on some hands which meet the rule of 19. Third hand limited hands can be opened on near average strength; 8 hcp or meet the rule of 17. Mexican 2D has been chose as a replacement to show some strong balanced hands easing interference and rebids after 1C-1D. Muiderberg bids showing 5M 4+m's have replaced the standard weak 2M.
Link to main Tprecision 2.0 doc <coming soon> email [email protected] if you can't wait.