Dabbaba
[ Stone-throwing machine [1] Dabbaba,
a chess playing program by Jens Bæk Nielsen, written from May 1995 to November 1998 in Turbo C to run on PC’s under DOS in graphics mode [2], also able to play chess variants like Knightmate Chess [3], Shatranj and many others [4]. During its iterative search [5] [6], 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 [7]. In May 2008, Jim Ablett released a WinBoard version of Dabbaba [8], and in August 2012, Jens Bæk Nielsen as well [9].
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.
Screenshot
Dabbaba Screen [10]
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
- Dabbaba (chess) from Wikipedia
- Fairy chess piece from Wikipedia
- Dabbāba (disambiguation) from Wikipedia
References
- ↑ A stone-throwing machine set to defend a gate, in the fresco of Guidoriccio da Fogliano by Simone Martini (14th century), Siege engine from Wikipedia
- ↑ Turbo C Graphics - initgraph function
- ↑ Re: agChess – an agressive chess variant by H.G.Muller, CCC, July 26, 2008
- ↑ The Chess Variant Pages - Dabbaba
- ↑ comp.lang.c FAQ list · Question 17.10
- ↑ Spaghetti code from Wikipedia
- ↑ Dabbaba by Jens Bæk Nielsen
- ↑ Dabbaba 0.98 with Winboard support available by Jim Ablett, CCC, May 08, 2008
- ↑ Dabbaba 6.50 has been released by Graham Banks, CCC, August 15, 2012
- ↑ Chess / Skak by Jens Bæk Nielsen