CeylonDemon 3.0 - new version chess engine
CeylonDemon is a free UCI chess engine with Resonance, a dual-frame NNUE evaluator that reads every position through two feature transformers — one anchored on the side to move's own king, one on the opposing king — and reports the residual between them as an uncertainty signal the search consumes directly.
Author: Madushan Bhashana Dissanayake Rating CEDR=3264
What's new?
CeylonDemon 3.3 is the strongest CeylonDemon so far.
Downloads
CeylonDemon-3.3-x86-64-avx2.exe works on most modern computers. Use this one if you're not sure.
CeylonDemon-3.3-x86-64-bmi2.exe can be a little faster on newer CPUs (Intel Haswell and later, AMD Zen 3 and later).
CeylonDemon-3.3-windows-x86-64.zip contains both, plus README, NOTICE, LICENSE and the release notes.
SHA256SUMS-3.3.txt lets you check the downloads.
What's new since 2.0
Resonance v12 dual-frame network, trained from scratch on 400,746,429 positions of CeylonDemon's own self-play.
Many search improvements from 2.2 to 3.3. In 3.3: singular extensions from depth 6, and late-move reductions for checks and captures.
CeylonDemon 2.0 took part in the qualifiers for the CEDR Chess Engine League in the 09/2026 season, scoring 6 points from 9 games in Group E and securing 7th place.
Comments
Post a Comment