Mobility: For the pieces other than Kings and pawns, add the square roots of the number of moves that the piece can make, counting a capture as two moves.

Piece safety: If a Rook, Bishop, or Knight is defended once, add 1 point; add 1.5 points if it is defended twice.

King mobility: Use the same method as above, but don’t count castling.

King safety: Deduct x points for a vulnerable King, with x being the number of moves that a Queen could move if it were on the same square as the one occupied by the King.

Castling: When evaluating a move, add 1 point if castling is still possible after the move is made. Add another point if castling is immediately possible or if the castling move has just been performed.

Pawn credit: Score 0.2 points for each square advanced, plus 0.3 points for each pawn defended by one or more non-pawns.

Checks and mate threats: Score 1 point for the threat of mate and a half-point for a check.

Point Values for Material: Pawn=1, Knight=3, Bishop=3.5, Rook=5, Queen=10