Dabbaba

a chess playing program written from May 1995 to Nov. 1998 by Jens Bæk Nielsen in C|Turbo C to run on PC's under DOS in graphics mode, also able to play chess variants like Knightmate Chess , Shatranj and many others. During its iterative search, maintaining a ply stack of irreversible aspects of the position, that is castling rights, en passant target, halfmove clock, and hash-keys, it updates its mailbox board and piece-lists incrementally during make and unmake move. A feature of Dabbaba is that it starts its search by using up to 20% of the allotted time for a move using a mate search at depth zero, following long sequences of checks to see if it results in a mate, material gain or perhaps a saving draw. To avoid a search explosion, Dabbaba considers ply-distance to the root and number of replies so that shallow lines are searched deeper than wide lines. In May 2008, Jim Ablett released a WinBoard version of Dabbaba, and in August 2012 the original author. toc =Etymology= The [|Dabbaba] (or dabaaba, dabbabah) is a [|Fairy chess piece] that jumps two squares orthogonally, leaping over intermediate pieces like a knight, also called [|(2,0)-leaper]. The [|Arabic] word [|dabbāba] formerly meant a type of [|medieval siege engine], and nowadays an [|army tank].
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 * [[image:Guidoriccio_mangonel.jpg link="http://en.wikipedia.org/wiki/File:Guidoriccio_mangonel.jpg"]] ||~ || **Dabbaba**,
 * Stone-throwing machine ||~ ||^ ||
 * Stone-throwing machine ||~ ||^ ||

=Screenshot=
 * [[image:dabbaba.gif link="http://www.jens-musik.dk/skak.htm"]] ||
 * Dabbaba Screen ||

=Forum Posts=
 * [|Dabbaba needs an openingbook] by Jens Bæk Nielsen, CCC, May 27, 1998 » Opening Book
 * [|Dabbaba 0.98 with Winboard support available] by Jim Ablett, CCC, May 08, 2008
 * [|Re: agChess -- an agressive chess variant] by H.G.Muller, CCC, July 26, 2008
 * [|Dabbaba 6.50 has been released] by Graham Banks, CCC, August 15, 2012
 * [|Dabbaba And The Cupcake] by Graham Banks, CCC, August 16, 2012
 * [|True iterative search...] by Jens Bæk Nielsen, CCC, November 27, 2012 » Iterative Search
 * [|Having fun with the evaluation function] by Jens Bæk Nielsen, CCC, December 31, 2012 » Evaluation
 * [|Human killer engine - a cafè-monster] by Jens Bæk Nielsen, CCC, February 09, 2013

=External Links=

Chess Engine
> [|DABBABA.C]
 * [|Chess / Skak] by Jens Bæk Nielsen
 * [|Dabbaba] by Jens Bæk Nielsen
 * [|The Chess Variant Pages - Dabbaba]
 * [|Summer98-Tournament: Description] by Torsten Schoop

Dabbaba

 * [|Dabbaba (chess) from Wikipedia]
 * [|Fairy chess piece from Wikipedia]
 * [|Dabbāba (disambiguation) from Wikipedia]

=References= =What links here?= include page="Dabbaba" component="backlinks" limit="30"
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