This is a very strong chess engine, finished 4th place at internatonal ChessWar X.
It uses the UCI (universal chess interface), for chess engines as communication protocol.
This means to play against it, you have to use an UCI capable interface, like knights or an xboard adapter like polyglot.

glaurung can be found at:

http://www.glaurungchess.com/

Authors:
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Tord Romstad

Oliver Korff (manual page, taken from Debian upstream)

Salvo Spitaleri (opening book "Book.bin")