Weiss

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Weiss, an UCI compliant open source chess engine by Terje Kirstihagen, written in C, first released in November 2019 under the GPL 3. Weiss was initially based on Vice and is inspired by Ethereal, Stockfish and Demolito. It is part of the OpenBench testing framework. Weiss had its tournament debut at TCEC Season 18 in May 2020.

=Features=

Board Representation

 * Dense Bitboard Board-Definition
 * 8x8 Board
 * Fancy Magic Bitboards
 * PEXT Bitboards

Search

 * Iterative Deepening
 * Aspiration Windows
 * Principal Variation Search
 * Transposition Table
 * Selectivity
 * Check Extensions
 * Late Move Reductions
 * Mate Distance Pruning
 * Null Move Pruning
 * Reverse Futility Pruning
 * Late Move Pruning
 * Razoring
 * Quiescence Search
 * Delta Pruning
 * Move Ordering
 * Hash Move
 * Internal Iterative Deepening
 * MVV/LVA
 * Killer Heuristic
 * History Heuristic

Evaluation

 * Tapered Eval
 * Material
 * Bishop Pair
 * Piece-Square Tables
 * Mobility
 * Rook on (Half) Open File
 * Pawn Structure
 * Passed Pawn
 * Isolated Pawn
 * King Safety - Virtual Mobility
 * Tempo
 * Automated Tuning

Misc

 * Syzygy Bases using Fathom
 * Perft

=Forum Posts=
 * Engine release: weiss by Terje Kirstihagen, CCC, November 19, 2019
 * Re: New engine releases 2019 by Terje Kirstihagen, CCC, December 06, 2019
 * Re: New engine releases 2020 by Terje Kirstihagen, CCC, January 07, 2020
 * Re: New engine releases 2020 by Terje Kirstihagen, CCC, February 14, 2020
 * Re: New engine releases 2020 by Terje Kirstihagen, CCC, April 25, 2020
 * Re: New engine releases & news 2021 (Weiss 1.4) by Terje Kirstihagen, CCC, July 02, 2021

=External Links=

Chess Engine

 * GitHub - GitHub - TerjeKir/weiss: Weiss - a UCI chess engine
 * Weiss in CCRL 40/15

Misc

 * weiss - Wiktionary
 * Weiss - Wiktionary
 * weiß - Wiktionary
 * white - Wiktionary
 * Weiss from Wikipedia
 * Weiss (crater) from Wikipedia
 * Weiß – Wikipedia.de (German)
 * White from Wikipedia
 * Hvit – Wikipedia.no (Bokmål)
 * Kvit – Wikipedia.nn (Nynorsk)
 * Häns'che Weiss Quintett, Dutch TV, 1977, YouTube Video
 * Lineup: Häns'che Weiss, Lulu Reinhardt, Ziroli Winterstein, Titi Winterstein, Hojok Merstein

=References= Up one Level