or bishop and queen, the pieces can get stronger than the sum of the individual pieces alone. When pieces lose their partner, their values slightly decrease. The king is priceless since its capture results in the defeat of that player and ends that game. However, especially in the endgame, the king can also be a fighting piece, and is sometimes given a fighting value of three and a half points. Space Other things being equal, the side that controls more on the board has an advantage. More space means more options, which can be exploited both tactically and strategically. A player who has all pieces developed and no tactical tricks or promising long-term plan should try to find a move that enlarges their influence, particularly in the center. In some openings, however, one player accepts less space for a time, to set up a counterattack in the middlegame. This is one of the concepts behind hypermodern play. The easiest way to gain space is to push the pawn skeleton forward. One must be careful not to over stretch, however. If the opponent succeeds in getting a protected piece behind enemy lines, this piece can become such a serious problem that a piece with a higher value might have to be exchanged for it. Larry Evans gives a method of evaluating space. The method (for each side) is to count the number of squares attacked or occupied on the opponent's side of the board. In this diagram from the Nimzo-Indian Defense, Black attacks four squares on White's side of the board (d4, e4, f4, and g4). White attacks seven squares on Black's side of the board (b5, c6, e6, f5, g5, and h6 – counting b5 twice) and occupies one square (d5). White has a space advantage of eight to four and Black is cramped. Control of the center The strategy consists of placing pieces so that they attack the central four squares of the board. A piece being placed on a central square, however, does not necessarily mean it controls the center; e.g., a knight on a central square does not attack any central squares. Conversely, a piece does not have to be on a central square to control the center. For example, the bishop can control the center from afar. Control of the center is generally considered important because tactical battles often take place around the central squares, from