fixes castling not printed correctly to PGN

move log has now three columns and starts scrolling after 45 moves

fixes move validation working on old king's position, when the king moves

fixes wrong macro expansion for is_attacked()

adds error messages to PGN reader

fixes inappropriate use of EXIT_ macros + adds a sample PGN file

simplifies Makefiles

using pkg-config in hand crafted make file

fixed hypthetical bug, where the client address is not correctly retrieved by accept()

updated copyright and version info

implemented FEN

fixed new network games starting with BLACK

added program version

added support for game continuation over network + fixed major bug in checkmate anticipation when the king is attacked diagonally

added pgn parser and writer (without comment support yet) + minor refactorings

logging string representation of moves in short algebraic notation

(0) -16 tip

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