Sapeli

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[ Sapeli Tree [1] Sapeli,

an UCI compliant, didactic open source chess engine by Toni Helminen, written in C along with some Python and shell scripts, licensed under the GPL v3.0. So far, Sapeli has separate routines to search White (max) and Black (min), and rudimentary selectivity without null move pruning.

Board Representation

• Classical Bitboard Board-Definition
• Plain Magic Bitboards

Search

• Iterative Deepening
• Alpha-Beta
• Max versus Min
• Late Move Reductions
• One Reply Extensions
• Transposition Table
• Quiescence Search
• MVV/LVA

Evaluation

• Evaluation Hash Table
• Tapered Eval
• Material
• Piece-Square Tables
• Mobility
• Pawn Structure
• King Safety

Misc#

• KPK Bitbases
• Chess960
• Perft

See also#

• Mayhem

Forum Posts#

• Sapeli 1.0 - New chess engine by JohnWoe, CCC, April 20, 2019
• Mayhem NNUE - New NN engine by JohnWoe, CCC, October 22, 2020
• Re: New engine releases 2020 by JohnWoe, CCC, November 23, 2020

External Links#

Chess Engine#

• GitHub - SamuraiDangyo/sapeli-final: Linux UCI Chess960 engine
• Sapeli 1.02 64-bit in CCRL 40/15
• Sapeli in CCRL Blitz

Misc#

• Sapele from Wikipedia
• Sapele, Delta from Wikipedia

References#

1. ↑ Sapeli Tree, Pokola, Republic of the Congo, Image by Robert Sharp, February 15, 2008, Sapele from Wikipedia

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