Author Archives: admin

Prophet4 rewrite status 5/31/20

The last couple of weeks have been focused on transitioning P4 from a single threaded engine that plays to a fixed search depth to a multi-threaded engine that can respond to commands while searching, and can search for a fixed … Continue reading

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chess4j + Prophet integration status 5/17/20

Several months ago I wrote about a proof-of-concept JNI integration between chess4j and Prophet4. At the time I had managed to compile Prophet4 as a static library, load that library into chess4j and write a JNI layer. The only function … Continue reading

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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

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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

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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

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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

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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

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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

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chess4j 3.5 is released

I’m releasing version 3.5 of my Java based chess engine, chess4j. The only changes since 3.4 are some bugfixes to the ponder search and changes in some logging levels. As always the source code is available on the project website … Continue reading

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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

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