Add a new rule named “Expertise” and give it the following text:

Each Engineer has a publicly-tracked integer named Expertise that defaults to 0.

There is a publicly-tracked number named Final Building that defaults to 0.

Whenever the Final Building is greater than 0, if there is only 1 Engineer who has the highest Expertise when the Building Number equals the Final Building, that Engineer achieves victory.

If there are 2 or more Engineers who have the highest Expertise when the Building Number equals the Final Building, any Engineer or the City Architect may increase the Final Building by 3.

Replace the step of the Build atomic action in the rule “The Building” that begins with “If the Building is not Collapsed, add 1 to their Safety Checks…” with the following:

* Calculate the Risk of this Build, where Risk = N - Building Stability - F.

* If the Building is not Collapsed, add 1 to their Safety Checks and add the Risk of this Build to their Expertise; otherwise, add 1 to their Accidents.

* If at least 1 Engineer has an Expertise of at least 500, and the Final Building is 0, set the Final Building to the current Building Number plus 3.

For each Engineer whose EVC on this proposal contains the name of a single Specialisation, set the Specialisation of that Engineer to the one they so named.