Editing Evaluation function (section)

====Example====
An example handcrafted evaluation function for [[chess]] might look like the following:
* c<sub>1</sub> * material + c<sub>2</sub> * mobility + c<sub>3</sub> * king safety + c<sub>4</sub> * center control + c<sub>5</sub> * pawn structure + c<sub>6</sub> * king tropism + ...

Each of the terms is a weight multiplied by a difference factor: the value of white's material or positional terms minus black's. 

* The material term is obtained by assigning a value in pawn-units to each of the pieces. 
* Mobility is the number of legal moves available to a player, or alternately the sum of the number of spaces attacked or defended by each piece, including spaces occupied by friendly or opposing pieces. Effective mobility, or the number of "safe" spaces a piece may move to, may also be taken into account. 
* King safety is a set of bonuses and penalties assessed for the location of the king and the configuration of pawns and pieces adjacent to or in front of the king, and opposing pieces bearing on spaces around the king. 
* Center control is derived from how many pawns and pieces occupy or bear on the four center spaces and sometimes the 12 spaces of the extended center. 
* Pawn structure is a set of penalties and bonuses for various strengths and weaknesses in pawn structure, such as penalties for doubled and isolated pawns. 
* King tropism is a bonus for closeness (or penalty for distance) of certain pieces, especially queens and knights, to the opposing king.