Structure of the genome:

Every genome is comprised of a number of tolerance bits (as represented by booleans), followed by a number of action bits. 5 action bits encode one action. There are a fixed number of actions for each possible permutation of environmental conditions (as discussed below), which is referred to as the number of action points.

Threshold bits:

Bit index	Usage
0	Strategic location st.dev. tolerance (1/2)
1	Strategic location st.dev. tolerance (2/2)
2	Combat win chance tolerance (1/4)
3	Combat win chance tolerance (2/4)
4	Combat win chance tolerance (3/4)
5	Combat win chance tolerance (4/4)
6	Queue length tolerance (1/3)
7	Queue length tolerance (2/3)
8	Queue length tolerance (3/3)
9	Banked resources threshold (1/6)
10	Banked resources threshold (2/6)
11	Banked resources threshold (3/6)
12	Banked resources threshold (4/6)
13	Banked resources threshold (5/6)
14	Banked resources threshold (6/6)
15	Turns left threshold (1/6)
16	Turns left threshold (2/6)
17	Turns left threshold (3/6)
18	Turns left threshold (4/6)
19	Turns left threshold (5/6)
20	Turns left threshold (6/6)
21	Default action/behavior (1/5)
22	Default action/behavior (2/5)
23	Default action/behavior (3/5)
24	Default action/behavior (4/5)
25	Default action/behavior (5/5)

Action encodings:

Binary code	Action
00000	Seize strategic location
00001	Seize resource
00010	Attack player 1
00011	Attack player 2
00100	Attack player 3
00101	Attack strongest military
00110	Attack strongest economy
00111	Attack weakest military
01000	Attack weakest economy
01001	Harass player 1
01010	Harass player 2
01011	Harass player 3
01100	Harass strongest military
01101	Harass strongest economy
01110	Harass weakest military
01111	Harass weakest economy
10000	Make (queue) worker
10001	Make (queue) tank
10010	Make (queue) air
10011	Make (queue) anti-air
10100	Fortify strategic location
10101	Fortify resource
10110	Fortify city
10111	Clear unit queue
11000	Combat win chance tolerance +10%
11001	Combat win chance tolerance -10%
11010	Combat win chance tolerance reset to default
11011	Turns left threshold -20%
11100	Turns left threshold +20%
11101	Turns left threshold reset to default
11110	Create new city
11111	No action

Environmental conditions:

Bit index	Usage
0	AI economy ranking (1/2)
1	AI economy ranking (2/2)
2	AI military ranking (1/2)
3	AI military ranking (2/2)
4	AI strategic location ranking (1/2)
5	AI strategic location ranking (2/2)
6	Attacked by player 1?
7	Attacked by player 2?
8	Attacked by player 3?
9	Lost mine last round?
10	Lost power plant last round?
11	Lost city last round?
12	Lost unit last round?
13	Built mine last round?
14	Built power plant last round?
15	Built city last round?
16	Units queued > threshold?
17	Resources banked > threshold?
18	Turns left > threshold?
19	Type of majority of global troops (1/2)
20	Type of majority of global troops (2/2)

These environment variables are fed to the AI each turn. The AI then converts this boolean array into an integer, which it uses to determine where in the genome to look for a set of responses (action codes) to perform during the turn.

Calculating the strategic value of a tile

Strategic locations are tiles which, if held, give a player increased control over the map. The strategic value of a given tile may be calculated as being the difference between the sum of the lengths of the paths from every city to every other city and from every city to every resource currently, and the same sum should that tile be made inaccessible/removed from the map (in cases where some routes are rendered impossible, this should count as an increase in distance of 500 tiles. The AI is usually only concerned with occupying strategic locations that are a number of standard deviations above the mean tile strategic value.

Calculating the economic ranking of a player

A player's current economic ranking can be calculated by summing the number of resources that player is able to gain per turn from all their mines.

Calculating the military strength of a player

A player's current military strength can be calculated by summing the number of resources the player has expended for each unit they currently have on the map.

What do the action codes mean?

The implementations of each of the action codes can be found here: http://www.chasestevens.com/ai_actions.html