Efficient triggering with the LHCb detector for precise cp measurements

LHCb experiment is designed to study CP violation in B-decays at the LHC machine at a luminosity of 2.10^32 cm-2s-1 and a rate of 40 MHz. It is crucial to efficiently select those pp-interactions containing the B-meson decays of interest. The expected physics reach of the LHCb experiment has recently been re-evaluated, after changes in the detector geometry and using full detector simulation and reconstruction. Both the trigger strategy and performance, as well as the new results on the expected physics reach will be presented for a few specific channels. (Proceedings of a talk presented at the 8th ICATPP Conference, Como, 6 Oct 2003)