http://www.chessknowledge.com/Chess_Instruction_Advanced/Chess Directory http://www.chesscenter.com/twictheory/ An electronic magazine for the chess community. High quality articles delivered to you in ChessBase, PGN or PDF format. TWIC Theory is a monthly service which will appear in the last week of every month. You can now subscribe for one year during which time you will receive the next twelve issues or you can buy them singly. Each issue is emailed to you as a PDF, ChessBase or PGN file.Sun, 23 Dec 2007 21:54:09 GMT