CeeChess
Hi! I am a bot written in C, heavily inspired by the Vice engine and video series done by Bluefever! If you want to try your hand at facing me, I am occasionally on lichess at https://lichess.org/@/seeChessBot, or permanently hosted within a web app socket at https://ceechess.herokuapp.com!
Rating: The rating for the latest release of the engine (v1.3.2) should be around ~2330 CCRL, which compares to around 2500 FIDE classical rating.
Estimated ratings for all versions:
Rank Name Elo
1 CeeChess-v1.3.2 : ~2330
2 CeeChess-v1.3.1 : ~2315
3 CeeChess-v1.3 : ~2310
4 SeeChess-v1.2 : ~2200
5 SeeChess-v1.1.3 : ~2180
6 SeeChess-v1.1.2 : ~2165
7 SeeChess-v1.1.1 : ~2150
8 SeeChess-v1.1 : ~2140
9 SeeChess-v1.0 : ~2060
Engine Features
Search: The Engine searches with a Principal Variation Search inside a Negamax framework
Lossless Pruning:
- Alpha-Beta pruning
- Mate Distance pruning
Lossy Pruning:
- Transposition Table
- Razoring
- Null Move Pruning
- Late Move Reductions
- Futility Pruning
- Static Null Move Pruning (Reverse Futility Pruning)
Move Ordering:
- PV Move
- Captures ordered by MVV/LVA (Most Valuable Victim/Least Valuable Attacker)
- 2 Killer Moves
- Quiet moves ordered by history heuristic
Evaluation:
- Material
- PSQT (Midgame and Endgame, from Lyudmil)
- Bishop pair heuristic (for Midgame and Endgame)
- Passed Pawn evaluation (Midgame and Endgame tables)
- Isolated pawn heuristic
- Open file heuristics (for Rook and Queen)
- Tapered evaluation
Planned Improvements (ordered by perceived feasibility):
- Syzygy Tablebases
- King Safety
- Mobility
- SEE (Static Exchange Evaluation)
Other Possible Improvements (No particular order):
- IID (Internal Iterative Deepening)
- Countermove Tables
- Singular Extensions
- Probcut
- Bitboards
- Aspiration Windows
None of the code I write is copyrighted or protected in any way, and you may make use of all that you wish. You do not have to credit me if you use any of the code I write, but it would be great if you did