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Study Chess Like You Mean It

Scid is a chess database application (cross-platform, for Unix/Linux and Windows) with many search and database maintenance features.

Manage databases with millions of games, analyze using UCI or Winboard engines, prepare for your next opponent, and much more.
And it's Free and Open Source (GPL Licensed).

 Scid is a powerful chess database application with many search features. Its GUI makes entering chess games fast and easy, and you can search games by exact position, material, player names, and many other criteria. It does not come with any actual file of chess games, but it can convert databases to/from the popular PGN format which is widely used for chess games.

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SCID, (Scid, Shane's Chess Information Database) a multi-platform, open source chess database under the GNU Lesser General Public License, to view, edit, and manage collections of chess games, initially developed by Shane Hudson, who worked from 1999 to 2003 on it, the back end written in C++, the GUI in Tcl/Tk. Pascal Georges worked on SCID from December 2006 until January 2010 and added UCI, FICS and Novag Citrine support, and ported SCID to the Pocket PC. Further contributors were Marc Lacrosse, Michal Rudolf, Hans Ericson, Franz Nagl and Alexander Wagner, et al.. SCID can read PGN and EPD files (and export to PGN, LaTeX and HTML) and uses its own database format for fast database search and queries by position, material, pattern, players, and opening, etc., and can use XBoard and UCI compliant chess engines to analyze games, and further supports mining of 5-man Nalimov Tablebases. The SCID library was used by Gady Costeff and Lewis Stiller to implement the Chess Query Language.

GUI chess

The SCID GUI, written in Tcl, evolved to a sophisticated multiple purpose tabbed document interface, with game lists of databases and game windows with board and tabbed notation, opening tree, and analyze panes as document views. Database queries and transactions are initiated via modal dialog boxes .

Chess Database Format

SCID Databases consist of three kind of files, index files (.si4), name files (.sn4) and game files (.sg4), the latter containing the moves, variations and annotations of each game. The compact move encoding requires an incremental updated board representation aka piece list, and therefor takes only one byte for most moves (except diagonal queen moves), using a nibble as piece list index, determining from square and piece to move, and the second nibble as enumeration index of possible target squares.

SCID for the Chess Student 2: Plugging in Databases and Engines 

To download the chess engine, Critter, go to http://ouo.io/0hfYA

To download Stockfish go to http://ouo.io/C2o3ZJ

Source: https://chessprogramming.wikispaces.com/SCID