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		Exacto, a Chess Engine Communication Protocol compliant open source chess engine written by Daniel Sparks in C++, the source code covered by a BSD license. Starting with version 0.e, released in March 2014, Exacto uses bitboards as internal board representation, while former versions, Daniel has worked on sporadically throughout the years, were 0x88 [1] .
Exact sequence [2]

Features

Version 0.e features plain magic bitboards ^[3] to determine sliding piece attacks.

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• Iterative Deepening
• PVS/Alpha-Beta
• Quiescence Search
• Reductions
  • Adaptive Null Move Pruning
  • Late Move Reductions
  • Pruning via Transposition Table
  • Futility Pruning (Frontier and Pre-frontier Nodes)
  • Razoring (Pre-pre-frontier Nodes)
  • Delta Pruning (in Quiescence)
• Extensions
  • Check Extensions
  • Recapture Extensions
  • Passed Pawn Extensions
• Move Ordering
  • Transposition Table
  • Internal Iterative Deepening
  • Static Exchange Evaluation
  • MVV/LVA

Evaluation

• Tapered Evaluation
• Lazy Evaluation
• Pawn Structure with Pawn Hash Table
  • Pawn Chains
  • Isolated Pawns
  • Backward Pawns
  • Doubled Pawns
  • Passed Pawns
• Evaluation of Pieces
  • Bad Bishop
  • Bishop Pair
  • Rook on Open File
  • Rook on Seventh Rank
  • Development and Castling
  • Undefended minor piece penalty
• King Safety
  • Enemy attacks on squares near king
  • Pawn fortress / Castling Destination
  • Open and Half-open files around the King
  • King Piece Tropism

Forum Posts

• Can you try running my engine? by Daniel Sparks, CCC, March 06, 2014
• Engine release Exacto 0.e by Daniel Sparks, CCC, March 10, 2014

External Links

Chess Engine

• dans595/exacto · GitHub

Misc

• exacto - Wiktionary
• Welcome to the Exacto Website!
• Exacto Watches
• Exactitud - Wikipedia.es (Spanish)
• exact - Wiktionary
• Exact sequence from Wikipedia
• Exact science from Wikipedia
• El Jazz y la Furia - Exacto, Universidad Michoacana de San Nicolás de Hidalgo, YouTube Video
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References

1. ^ dans595/exacto · GitHub
2. ^ Shows how any exact sequence is weaved together from several overlapping short exact sequences, Axel Boldt, February 2004, Exact science from Wikipedia
3. ^ Features of 0.e as given from the Exacto Homepage

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