Once the wall was completed, a zigzag path of 96 miles followed (177.79 kilometers), of which only 27 miles (50 km) divided Eastern Berlin from the west, the rest of the barriers was separating Western Berlin from the rural areas of Eastern Germany. Image Courtesy of commons.
A chess tournament is a series of chess games played competitively to determine a winning individual or team. Since the first international chess tournament in London, 1851, chess tournaments have become the standard form of chess competition among serious players.
A chess board represents an abstract space and a chess piece is a member of a set of finite elements where to each element is assigned a rule on how to change its coordinates in the abstract space. These rules also depend on the positions of other pieces. For example, a rule for a bishop is that it cannot proceed past another piece in its way.