Atlas (ESP)

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Atlas, an UCI compliant chess engine by Andrés Manzanares Campillo written in C++ - executables running under Linux and Windows. The development of Atlas started in 2004, initially representing the board as 0x88 vector attacks mailbox along with piece-lists, supporting WinBoard, and written in C. Atlas 2.90 was a complete rewrite released in June 2011, a bitboard approach only supporting UCI.

=Features=

Board Representation

 * Bitboards
 * Magic Bitboards

Search

 * Iterative Deepening
 * Aspiration Windows (unsymmetrical)
 * Principal Variation Search
 * Quiescence Search
 * Null Move Pruning with R==3 and Verification
 * Futility Pruning
 * SEE Pruning
 * Late Move Reductions
 * Check Extensions
 * Singular Extensions (3.90)
 * Transposition Table
 * History Heuristic

Evaluation
=Namesake=
 * Material
 * Material Hash Table
 * Piece-Square Tables
 * Mobility (non-linear)
 * Pawn Structure
 * Pawn Hash Table
 * King Safety
 * Atlas by Alex Bell

=Forum Posts=

2005 ...

 * Atlas 2 Winboard Engine crashes in Arena GUI by Marc Darius, Winboard Forum, April 20, 2005
 * Atlas 2.20 hash usage by Graham Banks, Winboard Forum, August 27, 2006
 * Confused with Atlas 2.20- Help Appreciated by George Speight, Winboard Forum, January 12, 2007

2010 ...

 * Atlas 3.60 Release by Andrés Manzanares, CCC, November 18, 2013
 * Atlas 3.70em Release by Andrés Manzanares, CCC, July 20, 2014

2015 ...

 * Atlas 3.80 release by Andrés Manzanares, CCC, February 06, 2015
 * Atlas 3.90 release by Andrés Manzanares, CCC, January 22, 2018
 * Atlas 3.91 (bugfix version) by Andrés Manzanares, CCC, January 26, 2018

2020 ...

 * Atlas website (update bookmarks) by Andrés Manzanares, CCC, October 10, 2020

=External Links=

Chess Engine

 * Atlas - Home
 * Atlas in CCRL 40/15

Misc

 * Atlas (computer) from Wikipedia
 * Atlas (disambiguation) from Wikipedia
 * Atlas from Wikipedia
 * Atlas Mountains from Wikipedia
 * Atlas (mythology) from Wikipedia
 * Farnese Atlas from Wikipedia
 * Atlas (rocket family) from Wikipedia
 * Atlas (star) from Wikipedia
 * Atlas (moon) from Wikipedia
 * Colossochelys atlas from Wikipedia

=References= Up one Level