Atlas (ESP)

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Sculpture of Atlas

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

• Material
• Material Hash Table
• Piece-Square Tables
• Mobility (non-linear)
• Pawn Structure
• Pawn Hash Table
• King Safety

Namesake

• 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

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