Scid vs. PC is a powerful chess database software that helps players of all levels improve their chess game. It is a very popular tool among amateur and professional chess players alike. It provides a comprehensive database of chess games, with powerful search and analysis tools. It also includes a built-in chess engine for playing against the computer, and a user-friendly interface for setting up positions and analyzing games. It also includes a library of opening books, endgame tablebases, and player biographies. With Scid vs. PC, users can access a large collection of chess games, including those from the past centuries. It also provides tactical and positional analysis tools, including a move tree, pattern search, and more. With the ability to analyze chess games in depth, players can improve their understanding of the game and progress faster.
XBoard is not a chess database, but a chess playing software.