Arasan 13.4 is available from http://www.arasanchess.org.
Changes in Arasan 13.4:
1) Fixes to UCI analysis mode.
2) Fix handling of UCI Threads option.
3) Arasan GUI allows changing thread count for search.
4) Support "cores," "memory" and "egt" features in Winboard. Note: Arasan
command-line switches take precedence over Winboard settings.
5) Memory for the evaluation cache is now dynamically allocated and
is sized relative to the main hash table.
6) Some changes to pruning and lazy eval logic.
7) Fixed faulty bitbase data. Fixed "eval" command to handle bitbase
and tablebase probes properly.
8) Improve UCI time management for very short time controls.
Note: I am not sure this version is any stronger than 13.3. But the bug fixes are significant.
--Jon