Elephant

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Elephant, a WinBoard compatible chess engine written by Harald Lüßen in C++, first released in March 2004. The name was chosen due to the connection with pieces in Chaturanga, Chinese Chess and chess, such as rook and bishop, because elephants are known to be intelligent, and further due its author's weight.

=Description= Elephant applies PVS alpha-beta with transposition table, quiescence, adaptive null move pruning, IID, razoring, futility pruning and various extensions, embedded inside an fractional ply iterative deepening framework. Move ordering at the root is based on node count, and otherwise considers hash move including principle variation, static exchange evaluation, killer- and history heuristic. Evaluation might be lazy and takes material, cached pawn structure, king safety, piece-squares tables, mobility and multiple other terms into account. Elephant was used as testbed to compare various bitboard techniques in generating sliding piece attacks, in particular Exploding- and Sherwin Bitboards.

=See also=
 * Arimaa
 * Elephant, the Chinese Chess engine by Shun-Chin Hsu, Shun-Shii Lin, Shih-Chieh Huang et al.
 * Hannibal
 * Jumbo

=Forum Posts=
 * Elephant 1.00, a new winboard engine by Harald Lüßen, CCC, March 15, 2004
 * Elephant and pondering by Olivier Deville, CCC, April 11, 2004 » Pondering
 * Playing with "The Secret of Chess" by Harald Lüßen, CCC, January 30, 2021 » The Secret of Chess

=External Links=

Chess Engine

 * Elephant from WBEC Ridderkerk (Wayback Machine)
 * Elephant 1.06 in CCRL 40/4

Chess and Variants

 * Indian Chess Sets
 * Chaturanga from Wikipedia
 * Xiangqi - Pieces from Wikipedia
 * Elephant Gambit from Wikipedia

Misc

 * Elephant from Wikipedia
 * Elephant (disambiguation) from Wikipedia
 * Blind men and an elephant - Wkipedia
 * War elephant from Wikipedia
 * King Crimson - Elephant Talk, live on Fridays (1981), YouTube Video
 * lineup: Tony Levin, Adrian Belew, Bill Bruford, Robert Fripp

=References=

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