The Zborowski-Bruchem Method (also known as the ZB method) was invented by Ron van Bruchem and Zbigniew Zborowski in 2003. After solving the cross and three F2L pairs, the final F2L pair is solved simutaneously with orienting the last layer edges. This is known as ZBLS. The final step in the Zborowski-Bruchem Method (known as ZBLL) involves orienting of corners, and permutation of corners and edges of the last layer. This method of solving the Rubik's Cube requires memorization of approximately 840 algorithms.