ESAI stands for "Enhanced Strategic AI". It is an AI Commander Enhancement for Battlefield 2. It is a replacement for the default DICE commander script.
This is a screen of my next ESAI:FH2 Edition target - Tunis 64. In the top left you can see that the SAI is using the same boring default attack strategy for both sides.
An after comparison with this map running ESAI coming as soon as I code the ESAI plugin for this map.