GRhino Othello/Reversi Program
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GRhino, or Rhino its former name, is an Othello/Reversi game on Linux and other UNIX-like systems as long as GNOME 2 libraries are installed. It is currently under development and a new version is available occasionally. The latest version is 0.16.1. You can download it here. (list of changes)

What distinguish GRhino from most other Othello games is that GRhino will be targeted for experienced Othello players. Strong AI is the main focus with some additional good, useful features (like an endgame solver) is planned. The ultimate target strength of the AI is that it should be able to beat the best human player at the highest difficulty level. Beating Logistello (the strongest program available) is not in the plan :)

Current Progress

Some important AI infrastructure has been finished. Pattern evaluator and open book are mostly done but still requires some further optimization and data file compression. Multi prob-cut to speedup the AI is still missing so it still has a limit on its game strength but this mostly affects playing against other strong AI out there. The main focus for current development is about user interface and features. Currently finished parts include

 - End game search. It can now solve the exact score (in about 20 sec on P-133) at around 15 empties and Win-Loss-Draw at a slightly higher number of empties.
 - Move ordering.
 - Start game from known openings.
 - Display opening name.
 - A decent pattern-based evaluation with parity knowledge.
 - A decent open book with opening variations allowed.
 - Browse IOS and GGS format game file.

Features that should be in the version 1.0 release are

 - Timed game for user (time control for AI is probably implemented later).
 - Multi prob-cut.

Features that are probably left out for the short term plan

 - Think on opponent's time.
 - Open book, pattern learning.
 - All sort of advanced stuffs like connecting to GGS, end game solver, browsing Thor database, etc.

Legal Matters

GRhino is distributed under the GNU Public License (GPL).

Othello is a registered trademark of Tsukuda Original, licensed by Anjar Co.

The program and this web page is maintained by Kriang Lerdsuwanakij (

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Last site update: September 5, 2010