Category Archives: Prophet

Prophet4 rewrite status 3/24/20

Killer moves have been implemented. Two killer moves are kept per ply. A killer move is defined as a non-capturing move that causes a fail high. A new killer move is stored in “slot 1,” while the previous killer move … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet4 rewrite status 3/24/20

Prophet4 rewrite status 2/16/20

Added a simple depth first search. The search uses the alpha/beta algorithm and recognizes checkmated and stalemated positions but otherwise has no “intelligence.” It is a simple fixed depth search without iterative deepening or timing. The next phase of work … Continue reading

Posted in chess4j, Computer Chess, Prophet | Comments Off on Prophet4 rewrite status 2/16/20

chess4j + Prophet4 POC

I just wrapped up a successful proof-of-concept to marry up my two chess engines – the Java based chess4j and the C based Prophet4 . Note, Prophet4 isn’t even a complete engine yet – it doesn’t even have a search! … Continue reading

Posted in chess4j, Computer Chess, Prophet | Tagged , | Comments Off on chess4j + Prophet4 POC

Prophet4 rewrite status 9/24/19

Evaluator complete. This is a verbatim “migration” of Prophet3’s evaluator. It was a little painful really, because the evaluation routines are clearly a major weakness in the program, but I think it’s important to port everything over and run some … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet4 rewrite status 9/24/19

Prophet4 rewrite status 8/30/19

The protocol handler is complete. Enough of the XBoard protocol has been implemented to play a complete game. Move selection is completely random. A 20,000 game match was run between identical copies of the program (which didn’t take long since … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet4 rewrite status 8/30/19

Prophet4

I’ve decided to start fresh, and completely rewrite Prophet from the ground up for the third time. The first iteration of Prophet was written around 2000. Prophet2 was started in 2007. Prophet3 was started in 2011 (see Shall we play … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet4

Prophet3 20180811 is released

It’s been about a year since the last release of Prophet3, which was version 20170909. The main changes since then are the addition of a pawn hash table, improved Winboard compatibility, and a ponder search (*). I also added a … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet3 20180811 is released

Another round of sparring partners for Prophet3

Back in early March I added aspiration windows to Prophet with a window of 1/3 pawn, as well as some futility pruning and delta pruning. My schedule hasn’t allowed me to do a lot of work on the code since … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Another round of sparring partners for Prophet3

Prophet’s sparring partners

Several months ago I decided to get a little more rigorous about how I test changes to Prophet. With previous versions of Prophet, I would make a change, run some test suites consisting of a few hundred or a thousand … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet’s sparring partners

Prophet is back

After a VERY long absence from server play, the rewrite of my chess engine Prophet is finally far enough along to play some games online. The engine itself has been capable of play for a little while now, but I’ve … Continue reading

Posted in Computer Chess, Prophet | Comments Off on Prophet is back