We always learn something from our environment and find patterns. If given numbers '2 3 5 7 11 13 17 19 23..' we immidiately recognize them as 'prime numbers'. It is easy for computer to recognize patterns from numbers. People usually make decision based observed patterns. Some creative people go on to create new patterns in life... etc.
Chess is game where we can deduce number of patterns. We may not know sometime, what pattern we are looking for. Ex. (1). We may find out from analyzing the game that player 'A' always castle as early as possible in the game. Player 'B' wait till he realizes that his king is in danger. (2) We can find typical 'forks' that a chess player is using.
These can reveal the "chess player's chess-nature" player in descriptive terms. Just like DNA can reveal blue print of our life.
I may be able to do chess parsing from number of different format. Ex. PGN which can use Chess::Pgn. Ultimately, I like to write a good chess engine.