Igel
[.jpg) European hedgehog - an Igel [1] Igel,
an UCI compliant open source chess engine by Volodymyr Shcherbyna licensed under the GPL, initially based on GreKo 2018.01 and following independent development since 2018. In August 2020, Igel switched to NNUE as a main evaluation function using Dietrich Kappe’s Night Nurse net [2] [3] as default [4] participating in TCEC Season 19, League 2, and promoting to League 1. In October 2020 Igel switched to own network trained on Igel 2.6.0 (Hand Crafted Evaluation) participating in TCEC Cup7 and in TCEC Season 20.
Board Representation
Search
- Lazy SMP
- Fail Soft Alpha-Beta with Principal Variation Search
- Extensions and Reductions
- Variable Aspiration Windows
- Transposition Table
- Null Move Pruning with variable R
- Futility Pruning
- Late Move Pruning
- Eval Pruning (a.k.a. static null move)
- Internal Iterative Deepening in PV-Nodes
Evaluation
- NNUE (as of Igel 2.7.0)
- Material Evaluation
- Piece-Square Tables
- Mobility
- Tapered Eval
- Pawn Hash Table
- Passed Pawns Eval
- Strong Squares (B, N)
- King Safety
Misc
Selected Games
Igel 2.6-dev-3 x64 vs. Booot 6.4 x64, July 2020 by TCEC
Forum Posts
2018
- Introducing Igel chess engine by Volodymyr Shcherbyna, CCC, July 03, 2018
2020
- Re: Introducing Igel chess engine - Igel 2.5.0 by Volodymyr Shcherbyna, CCC, June 15, 2020
Re: Introducing Igel chess engine - Igel 2.6.0 by Volodymyr Shcherbyna, CCC, August 01, 2020 Re: Introducing Igel chess engine - Igel and NNUE by Volodymyr Shcherbyna, CCC, August 19, 2020 Igel Generation Networks (IGN) by Volodymyr Shcherbyna, CCC, October 30, 2020 Re: Introducing Igel chess engine - Igel 2.9.0 by Volodymyr Shcherbyna, CCC, December 25, 2020
- Night Nurse 0.2 by Dietrich Kappe, CCC, August 19, 2020
2021
- Re: New engine releases & news 2021 (Igel 3.0.0) by Volodymyr Shcherbyna, CCC, April 04, 2021
- Igel 3.0.5 by Volodymyr Shcherbyna, CCC, April 27, 2021
- Re: will Tcec allow Stockfish with a Leela net to play? by Connor McMonigle, CCC, June 17, 2021 » NNUE
Re: will Tcec allow Stockfish with a Leela net to play? by Connor McMonigle, CCC, June 17, 2021
External Links
Chess Engine
Misc
- Igel from Wikipedia.de
- Erinaceidae from Wikipedia
- Hedgehog from Wikipedia
- Hedgehog (chess) from Wikipedia
References
- ↑ European hedgehog
- ↑ Night Nurse is Bad Gyal in disguise by Dietrich Kappe, CCC, July 30, 2020
- ↑ Night Nurse 0.2 by Dietrich Kappe, CCC, August 19, 2020
- ↑ Re: Introducing Igel chess engine - Igel and NNUE by Volodymyr Shcherbyna, CCC, August 19, 2020