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Adept II

Zeta OpenCL Chess

v 0.915 Developer Release


i published the Source Code of Zeta, a Chess Programm running in OpenCL on a GPU, under GPL:

for Nvidia Devices:

and for AMD GPUs or Intel/AMD CPUs

See my blog for more Information:

Zeta is more a prototype than a real chess engine. It uses only one SIMD Unit of a GPU with 128 Threads,
this is enough to achieve about 100 000 NPS, but still far away from that what a GPU is really able to compute, it is like using only 1 of 16 Cores.

Zeta is written in OpenCL, so it is able to run on GPUs, CPUs, APUs.

Zeta plays weak and buggy, a lot of well known chess techniques are not implemented.

So, whats inside?

- SPPS - a Simple Parallel Processing Scheme
- Quad-Bitboard Board Representation (Thanks to Gerd Isenberg,
- Magic Bitboard Move Generator (Thanks to the Stockfish Team)
- Tablebased Evaluation (Thanks to Tomasz Michniewski,

What's missing?

- Castle Moves
- En Passant Moves
- AlphaBeta Pruning
- Qsearch
- SMP over mutlible SIMD Untis
- All other well known techniques

Supported Platforms?
Until now only Linux with AMD OpenCL SDK or NVIDIA OpenCl SDK. No binaries.
CPUs (>=SSE3) will also work with AMD OpenCL SDK.

So feel free to contribute in GPU Chess 🙂

Srdja Matovic

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