Chiron Chess Engine
Chiron is the italian computer chess champion and it is among the strongest chess programs in the world.
Chiron comes with a polyglot book adapted to its playing style and its main features are:
playing strength of about 3050 Elo points on single core
parallel search for up to 16 threads
adjustable playing strength with autolimitation of book knowledge
support for UCI and Winboard2 communication protocols
MultiPV and searchmoves for game analysis
support for Chess960
support for Polyglot and CTG opening books
support for Nalimov and Gaviota tablebases
support for Shawul bitbases
smart detection of pawn blockages
Chiron is available for Windows and works with any chess interface you like.