If king safety is a serious issue, a well-executed attack on the king can render other considerations, including material advantages, irrelevant. Material is another important consideration, Fine notes that—if all other things are equal—any material advantage will usually be decisive. According to Fine, a material advantage will usually not give a direct mating attack unless the advantage is very large a rook or more , rather it can be used as a means of gaining more material and a decisive endgame advantage. To gain mobility is to ensure that the pieces have a wide scope of action and targets to focus on. The concept is largely strategic in nature, and involves such concepts as space, pawn weaknesses since weak pawns can compel pieces to defensive duties, reducing their mobility , and securing outposts for the pieces. The strategy required for middlegame play varies considerably.
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The first line of moves means that it contains openings beginning 1. The second line means it contains openings with 1. The title is given in eight languages. It is presented as a five-volume book collection now also a computer database describing chess openings.
The moves were taken from hundreds of thousands of games between masters, from published analysis in the Chess Informant since , and then compiled by notable chess players. These openings are typically provided in an ECO table that concisely presents the best opening lines. The books contain only a small amount of text, which is in eight languages.
The bulk of the book consists of diagrams of positions and chess moves in International figurine algebraic notation , with special symbols for comments about moves see Chess annotation symbols. Instead of the traditional names for the openings, ECO has developed a coding system that has also been adopted by other chess publications. There are five main categories, "A" to "E", each of which is divided into subcategories. Openings such as the Latvian Gambit 1.
These openings are all lumped under a single code such as E00 or A ECO code is a registered trademark of Chess Informant.
Encyclopedia of Chess Combinations, 5th edition + Encyclopedia of Chess Miniatures
Encyclopedia of Chess Combinations
Encyclopaedia of Chess Middlegames: Combinations