Chiron 2 is about 40 Elo points stronger than Chiron 1.5 thanks to improvements in both search and evaluation functions.
Parallel search and time management have been improved too.
Several ChironBitbases have been integrated in the executable:
KBKP, KBPK, KNKP, KNPK, KPKP, KPPK, KPPKP, KQKB, KQKN, KQKP, KQKQ, KQKR, KRKB, KRKN, KRKP, KRKR
as well as 4 tablebases: KPK, KRK, KQK and KPKP with rammed pawns.
Besides that, some bugs have been fixed:
– Chiron would often crash with multi-socket systems
– Gaviota tablebases were rarely probed
I would like to thank Martin Thoresen and Ingo Bauer that have helped with testing.