Spartan

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Spartan, an UCI compliant open source chess engine by Christian Daley, written in C and distributed under the GNU General Public License, first released in April 2016 as successor of JFresh. As a pure bitboard engine, Spartan applies Matt Taylor's folding trick to scan bits, and Brian Kernighan's way to count bits. In calculating king passer tropism in evaluation, Spartan uses the Euclidean distance between king and passer squares with double arithmetic due to C standard library square root (double sqrt(double)) of the sum of squares of rank difference and file difference, which is quite expensive. Recommended is looking up the Chebyshev distance or Manhattan distance for that purpose. =Features=

Board Representation

 * Bitboard Board-Definition
 * Magic Bitboards

Search

 * Iterative Deepening
 * Aspiration Windows
 * Alpha-Beta
 * Principal Variation Search
 * Transposition Table
 * Selectivity
 * Razoring
 * Futility Pruning
 * Null Move Pruning
 * ProbCut
 * Late Move Reductions
 * History Leaf Pruning
 * Quiescence Search
 * Delta Pruning
 * SEE Pruning
 * Move Ordering
 * Static Exchange Evaluation
 * Killer Heuristic
 * History Heuristic

Evaluation

 * Material
 * Tapered Eval
 * Piece-Square Tables
 * Mobility
 * Rooks on (Semi) Open Files
 * Connectivity
 * Pawn Structure
 * Pawn Hash Table
 * Backward Pawn
 * Doubled Pawn
 * Isolated Pawn
 * Passed Pawn
 * Unstoppable Passer
 * King Passer Tropism
 * King Safety
 * Attacking King Zone
 * Pawn Shelter
 * Pawn Storm

Misc

 * Bratko-Kopec Test
 * CCR One Hour Test

=See also=
 * JFresh
 * Spartan Chess

=Forum Posts=
 * New UCI engine: Spartan by CDaley11, OpenChess Forum, April 23, 2016
 * New UCI engine Spartan released (a while ago) by Günther Simon, CCC, May 11, 2016

=External Links=

Chess Engine

 * GitHub - christiandaley/Spartan: UCI chess engine
 * Spartan 1.0 in CCRL Blitz

Misc

 * spartan - Wiktionary
 * Spartan - Wiktionary
 * Spartan Chess - Chess Variant Page
 * Spartan Race from Wikipedia
 * Sparta from Wikipedia
 * Sparta (disambiguation) from Wikipedia
 * Broken Brass Ensemble - Spartan, North Sea Jazz 2019, NPO Radio 2 Soul & Jazz, YouTube Video

=References= Up one Level