Chiron 4 is about 70 points stronger than Chiron 3.

 

Here’s a list of the main changes:

• improved automatic tuning of the evaluation
• improved evaluation of passed pawns, mobility, opposite bishops endings
• improved forward pruning in the search
• improved LazySMP for parallel search
• support for Windows Processor Groups (more than 64 threads can now be used)
• NUMA optimization (new UCI and Winboard options “NUMA”)
• minor speed optimizations
• fixed a pondering bug
• fixed two time management bugs under the Winboard protocol

Chiron 4 is available for Windows and Android.
Buyers of the Windows version will also receive a code to get the Android one for free.

 

Chiron 2/3 Customers can buy Chiron 4 with a discount through the link they have reiceved. Whoever has bought Chiron 3 in the last month will receive Chiron 4 for free.