Revision as of 15:55, 6 July 2019

A Young Gerbil ^[1]

Gerbil,
an open source chess engine under the GNU General Public License ^[2], written by Bruce Moreland, written for educational purposes. It has a decent search (null move pruning, hash tables) but a rudimentary evaluation ^[3].

Features

Bruce on Gerbil ^[4]:

It is using 0x88 move generation. The function is something under 200 lines long, which seems big, but there are a lot of comments and there's some repeated code.
It is using vanilla windowed alpha-beta with no PVS or anything like that, and I plan to keep it this way, since that is clear and performs acceptably.
It has a check extension. I think that is enough for now. I may try to do some pruning in the quiescence search, which uses MVV/LVA. I don't plan to write a static exchange evaluator.
This is already a more or less fully functional winboard engine, an effort that consumed a whole bunch of time, not that Mann's standard is hard to write to. I just had to spend a lot of time messing with threads.

@@ Line 27: / Line 27: @@
 * [https://www.stmintz.com/ccc/index.php?id=179247 Question about Gerbil] by [[Artem Petakov|Artem Pyatakov]], [[CCC]], July 11, 2001
 * [https://www.stmintz.com/ccc/index.php?id=189800 Re: Ferret/Gerbil question] by [[Bruce Moreland]], [[CCC]], September 21, 2001
+* [https://www.stmintz.com/ccc/index.php?id=476082 Movei-Gerbil in rhe endgame suite 20.5-9.5 and could be 21.5-8.5] by [[Uri Blass]], [[CCC]], January 01, 2006 » [[Movei]]
 =External Links=