Drools 6 is a Business Logic Integration Platform which provides a unified and integrated platform for Rules, Workflow and Event Processing. This talk focuses on major changes in the platform rule engine component called Drools Expert. Version 6.0 introduces new pattern matching algorithm called PHREAK. We give a brief introduction to the previous RETE-OO algorithm, focusing on potential issues which have been addressed by PHREAK. The main ideas of PHREAK algorithm are presented, including examples of problems which can be solved more efficiently than by its predecessor.