OlympusCz & OlympusEvolvedCz - Two Czech AI bots control Lichess!

OlympusCz (Stockfish 17 version) – A precise computational monster
This version of the bot is built on Stockfish 17, which is currently the most powerful chess engine in the world, using NNUE neural network and brute computing power.
What makes it so strong?
The latest development version of Stockfish 17 with improved position evaluation
Extreme calculation depth thanks to 16 CPU threads and 8GB hash memory
Uses the best opening books (Cerebellum, Perfect2021) for GM-level openings
Syzygy tablebases ensure perfect endgame play
Pondering (thinking about the opponent's move) is active for maximum power
OlympusCz is great at calculating long variations, positional play and precise endgames. It is the closest alternative to modern GM analyses!

OlympusEvolvedCz (Lc0 version) – The power of neural networks
While Stockfish relies on brute computing power, OlympusEvolvedCz uses Leela Chess Zero (Lc0) – a chess AI that learns like a human using neural networks. This approach gives the bot a more human-like playstyle and allows it to play more creative and intuitive moves.
How is it different from the Stockfish version?
Uses neural networks for a more natural and creative playstyle
Plays better in strategic and positional games
Stronger in intuitive positions where Stockfish relies on computation
Optimized for GPU computation – runs on CUDA (NVIDIA) or OpenCL (AMD)
Uses custom opening books for faster entry into the game
OlympusEvolvedCz is ideal for players who want to experience the power of AI that behaves more like a human. It has more intuitive planning and great positional understanding.

Which bot is stronger?
OlympusCz (Stockfish 17) It excels in accurate calculation, endgames and long variations
OlympusEvolvedCz (Lc0) It has better strategic thinking and a more natural style of play
Against strong bots (3200+ Elo), Stockfish is still dominant, but Lc0 can surprise with its intuition in unknown positions.
Want to try them out? Come to Lichess and send them a challenge! Can you beat the best Czech AI?
Conclusion
Both bots are extremely strong and show different approaches to chess - computational power versus strategic intuition. Each has its strengths and is best expressed in different types of positions.
If you want to experience the raw power of analysis, try OlympusCz. If you want the feeling of playing against a human grandmaster, try OlympusEvolvedCz.
Which bot is better? It's up to you!