Mantissa
Mantissa’s Logo [1] [2] Mantissa,
an UCI compatible open source chess engine by Jeremy Wright, written in Rust, licensed under the GPL v3.0, first released in September 2021 [3]. Supported by Zahak author Amanj Sherwany, Mantissa v3.0.0, released in December 2021, came with an NNUE implementation of a 769 -> 128 -> 1 net topology. In Mantissa v3.3.0, released in January 2022, the net topology was changed due to an inspiration from reading Koivisto’s source code, considering board symmetry. Now instead of a 769th feature for side to move, the new net uses 2 sets of 128 neurons in the hidden layer with mirrored weights to reflect the game from the point of views of both sides.
Board Representation
Search
- Iterative Deepening
- Aspiration Windows
- Lazy SMP
- Principal Variation Search
- Transposition Table
- Selectivity
- Move Ordering
Evaluation
- NNUE (v3.0.0)
- Tapered Evaluation
- Material
- Bishop Pair
- Piece-Square Tables
- Mobility
- Rook on Seventh
- Rook on (Semi) Open File
- Pawn Structure
- King Safety
Forum Posts
- New Engine: Mantissa by Jeremy Wright, CCRL Discussion Board, September 19, 2021
- Mantissa 3.0.0 by Jeremy Wright, CCC, December 10, 2021
- Re: New engine releases & news H1 2022 by Jeremy Wright, CCC, January 11, 2022
External Links
Chess Engine
Misc
- Mantissa from Wikipedia
- Common logarithm from Wikipedia
- Significand from Wikipedia
- Mantissa - Land of The Living (1992), YouTube Video
