What is Chiron?
Chiron is a chess engine. It supports both UCI and Winboard protocols. It supports multiple processors, can play Chess960 and you can limit its strength if it’s too strong for you.

What is a chess engine?
A chess engine is a program that can play or analyze chess games. It is usually a console application that needs a graphical user interface (GUI) with which it communicates through a protocol.

What do I get when I buy Chiron?
You will receive by email both the 32 and 64 bit multiprocessor versions for Windows.

Will I receive free updates?
If you bought Chiron during the preorder days, you will receive free lifetime updates.

Will be there a Linux or an OS X version of Chiron?
At present there are no plans for a port of Chiron to other operative systems. If and when it will be done, all the past customers will receive these versions for free.

Is Chiron copy protected? On how many computers can I use it?
Each customer will receive an unique copy of Chiron so that if a customer put his copy on sharing sites or p2p networks, I would know his name. That customer will not receive any further updates. By buying Chiron you are accepting that. So please avoid sharing your copy.
You can use Chiron on any computer you own.

How much stronger is the parallel version?
With 4 threads, Chiron is about 100 Elo points stronger than the single thread version.

Which graphical user interface should I use with Chiron?
There are many interfaces both commercial and free. Here’s a list of the major ones:
• Arena
• ChessGUI
• Winboard
• Aquarium
• Chessbase/Fritz
• Shredder
• Chess Assistant
• Chess Partner
The first three are free while the others are commercial.
Chiron can work with any of them.

What opening books can I use with Chiron?
Chiron supports Polyglot and CTG opening books.

What are Scorpio bitbases?
Scorpio bitbases are files containing only informations about weather a position with 6 or less pieces is draw, won or loss. They were made by Daniel Shawul, programmer of the Scorpio engine. 5 pieces bitbases occupy only 225MB and thus can even be loaded directly to RAM for fast probing.

What are Nalimov and Gaviota tablebases?
They are files containing perfect informations (distance to mate) about positions with up to 5 or 6 pieces. Nalimov tablebases have been developed by Eugene Nalimov while Gaviota tablebases by Miguel Ballicora, programmer of the Gaviota engine. Both the sets are about 7GB in size for 5 pieces tablebases (Gaviotas a little less).

What are Syzygy Bases?
They are composed by two sets of files. The WDL ones contains win/draw/loss informations about positions with up to 6 pieces and are used during the search. The DTZ (Distance To Zero) ones are used at the root and contains informations about the distance to the next capture or pawn move. They have been developed by Ronald de Man. The WDL sets for 5 and 6 pieces are, respectively, 378MB and 68.3GB, while the DTZ ones are 561MB and 81.9GB.