- silent update, version number is unchanged.
- added a 64-bit version for older cpus without SSE 4.2.
http://www.arasanchess.org/arasanx-64.exe
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Games Completed = 263 of 1000 (Avg game length = 11.073 sec)
Settings = RR/32MB/2000ms+100ms/M 700000cp for 7 moves, D 150 moves/EPD:E:\LittleBlitzer\openings.epd(4000)
Time = 907 sec elapsed, 2542 sec remaining
1. Arasan 15.2 w32 168.5/263 159-85-19 (L: m=9 t=76 i=0 a=0) (D: r=19 i=0 f=0 s=0 a=0) (tpm=146.4 d=11.37 nps=690288)
2. Arasan 15.3 w32 94.5/263 85-159-19 (L: m=5 t=154 i=0 a=0) (D: r=19 i=0 f=0 s=0 a=0) (tpm=148.1 d=11.42 nps=663692)
Games Completed = 1000 of 1000 (Avg game length = 14.871 sec)
Settings = RR/32MB/2000ms+100ms/M 700000cp for 7 moves, D 150 moves/EPD:E:\LittleBlitzer\openings.epd(4000)
Time = 4312 sec elapsed, 0 sec remaining
1. Arasan 16.0 538.0/1000 394-318-288 (L: m=290 t=28 i=0 a=0) (D: r=212 i=42 f=29 s=0 a=5) (tpm=124.2 d=10.91 nps=86119)
2. Arasan 16.1 462.0/1000 318-394-288 (L: m=241 t=153 i=0 a=0) (D: r=212 i=42 f=29 s=0 a=5) (tpm=125.1 d=10.93 nps=860570)
Jon Dart wrote:Arasan 17.0 is available from http://www.arasanchess.org.
Changes in Arasan 17.0:
1) A common hashtable is now used in both quiescence and non-
quiescence search, instead of using a separate q-search eval
cache (hashtable stores static evals so also serves as an
eval cache).
2) Scoring module no longer does lazy eval.
3) Opening book format has changed. Manual tuned book file is
now annotated PGN instead of a custom text format. Book code
is simplified.
4) Opening book is no longer modified at runtime by result and
score learning. Only position learning (aka permanent brain)
is supported now.
5) Improvements to opening book and ECO classifier.
6) Qsearch no longer does pre-selection of capture targets.
Qsearch forward pruning margin and logic changed.
7) Bug Fix: correct time field of "post" output for Winboard/xboard
(was off by factor of 10).
8) Bug fix: declare on startup for UCI that the tablebase type
option is "Tablebase type", not "TablebaseType".
9) Bug fix: check for previous move legal before returning draw
score.
10) Bug fix: Don't apply history pruning to moves before the
history phase of move generation.
11) Bug fix to KP + wrong Bishop vs. K draw detection.
12) Bug fixes to lockless hashing. But also: restore validity
check for moves fetched from hash, since lockless hashing
is not 100% reliable.
13) A few evaluation changes.
14) Improved debug output when -DSEARCH_STATS enabled.
15) Performance fix: remove unneeded update of node count at end
of search function.
16) Change to time usage: generally uses more time in early phase
of games.
17) Changes to razoring.
Overall this version is measurably stronger than 16.3 in my testing but it is not a huge difference. However, there are significant internal changes and I expect it will play differently from 16.3. The opening book is also significantly re-done in this version.
Changes in Arasan 17.1:
1) Scoring changes: connected passer code, knight and bishop
piece square tables, new king safety scoring.
2) Add special-case eval code for K vs K+R and K vs K+Q endgames.
3) Bug fix: validate hash move in q-search before using it.
4) Changes to handling of book selectivity option.
5) Adjust variable strength option so bottom end of strength scale
is lower (will blunder sometimes).
6) Increase ply depth in reduced strength mode for very low material
endgames (engine was having difficulty mating in these cases
even at moderate strength settings). This also fixes some
problems with playing into stalemate.
7) Better handling of out-of-memory errors when allocating hashtable.
8) GUI fix: initialize all engine options at start of game. Fixes
problem with resignation setting not being obeyed.
9) GUI fix: clear any previous game result and other details after
loading a position file.
This version also has significant changes to the opening book. Overall it is measurably stronger than 17.0 but it is not a huge difference.
--Jon
Changes in Arasan 17.2:
1) Fix "st" command in Winboard protocol to interpret time as seconds.
2) Scoring changes: king safety, king cover, weak pawns.
The king safety changes are significant (there was a bug in the 17.1 scoring code). Also this version has quite a few changes to the opening book.
--Jon
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