Onno Chess Software : History

Legend

• Public releases are shipped to all customers, announced on the website.
• Beta releases are sent to some or all beta testers.
• Fixes fix some minor problem, are sent to users that need that specific fix. Nonetheless the fix is also contained in the next beta or public version.
• An exceptional case is version 1-2-2. Though this is in beta state, it is announced on the website and all interested customers can download it.

Version 1-2-70, 2010-05-15, public

• more communication between threads, thus reduced variance and slightly reduced average of search times on larger numbers of processors
• minor changes to the search algorithm (also for one processor)

Version 1-2-6, 2010-04-10, public beta

• stable on any number of threads
• improved efficiency of thread communication, thus more nodes per second
• more splits, thus better speedup in blitz

Version 1-2-2, 2010-02-24, public beta

• default for number of threads set to maximum

• pretends to be 1-2-1
• poor speedup in blitz due to too few splits
• only works up to 7 threads
• occasional crashes (about one per 24 hours) even with 7 or fewer threads

Version 1-2-1, 2010-02-21, beta

• seldepth no longer counts quiescence search (i.e. engine shows shallower seldepth, but the search has not changed)
• sending of periodic messages like nps triggered by timer rather then by node count
• multi processor support

Version 1-1-1, 2009-08-29, public

• when search is done, resends PV after 1.5 seconds (for GUIs that miss first PV)

Version 1-1-0, 2009-08-23, beta

• endgame tablebases

Version 1-0-4, 2009-07-16, public

• applied new hashing scheme only on positions with at most 4 men
• even more stable against installation problems

Version 1-0-3, 2009-07-01, beta

• new hashing scheme in endgame
• allowed 16 GB hash for the 64 bit version
• allowed larger random intensity (but default unchanged)
• full path moved from "UCI_EngineAbout" to new option "Show Full Path" (workaround for bug in Fritz GUI, most likely due to buffer overrun)
• some output corrections (hash usage, faillow/failhigh, order of currmove/pv)

Version 1-0-2, 2009-06-08, fix

• more stable against installation problems

Version 1-0-0, 2009-05-27, public

first public version

• option to disable randomness
• renamed logo file
• catch up on pv if not sent due to output supression in first second

Version 0-13-2, 2009-05-17, beta

• very slight speedup (about 1%)
• inclusion of a 32 bit version
• new internal license key, incompatible with previous versions
• program icon

Version 0-12-2, 2009-03-28, beta

• fix for SyncStop issue in Polyglot

Version 0-12-0, 2009-02-12, beta

• slight speedup (about 7%) (in terms of nps, but seems to be a little slower due to new node counting)
• new node counting (old node counting was not very consistent, now counts one node on every do_move)
• slight improvement of pruning if mates are found in the search tree
• improvements in license management
• option "Verbose Level" to adjust amount of output, esp. now possible to disable all "info string"
• successful license checking no longer produces any "info string"
• option "Log Level" to write logfiles

Version 0-11-0, 2008-12-20, beta

first version