The AI algorithm became more intelligent: now it's analyzes the game one turn ahead. Besides that some degree of randomness was added. The overall difficulty was increased: the new algorithm beats the old one 764 times out of 1000.
The web-site build was updated
UPD April 2016: to select the algorithm mentioned in the post you have to choose "Eva+" in the player dropdown list of a custom game menu.
Also some work was made to create an application for ideal game results evaluation for any level of the StoneDrop, but it will be revealed in upcoming posts :)