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Doch,
an UCI compliant chess engine by primary author Don Dailey, supported by chess advisor and evaluation expert and Don's long time collaborator Larry Kaufman. The development started in 2007 ^[1], and it was first released to the public as free engine in fall 2009 ^[2].

Komodo

In January 2010, Doch evolved to Komodo ^[3] to become one of the strongest programs ever.

Etymology

Doch is acronym of Don's Chess. Quote from a Frank Quisinsky interview, December 2009 ^[4]:

Doch was never intended to be the name that would stick. When I first decided to write this program I needed a name and did not want to spend days obsessing over it. I did not want to call it "chess" but it needed a name to give it some personality. Doch stands for DOn's CHess. I never got around to giving it a proper name and I feel a bit immodest calling it after my own name!

Copy-Make

Doch was a 64-bit aka bitboard program, applying a Copy-Make approach with a position state of 192 byte allocated on the stack ^{[5] [6]}

position search( position_state *prev,  ...  )
{
   position_state  new_position;
   ... other stuff
   foreach move in movelist do {
       make( prev, &new_position, move );
   }
} 

See also

• Acronym
• Komodo
• Occam

Forum Posts

• Doch 09.980 (uci) by Don Dailey available by Jim Ablett, CCC, November 13, 2009
• Doch 1.2 update (uci) by Don Dailey available by Jim Ablett, CCC, December 15, 2009
• Doch 1.3.1 by Don Dailey, CCC, January 05, 2010
• A New Name for Doch.... by Fernando Villegas, CCC, January 07, 2010

External Links

• doch - Wiktionary
• Doch! ...and Other Tricky German Words, About.com

References

1. ^ About Komodo by Larry Kaufman
2. ^ Doch 09.980 (uci) by Don Dailey available by Jim Ablett, CCC, November 13, 2009
3. ^ Komodo credit by Don Dailey, CCC, January 22, 2010
4. ^ Computerschach, Interview with Don Dailey by Frank Quisinsky, Schachwelt.de, December 18-20, 2009
5. ^ Re: undo move vs. Position Cloning by Don Dailey, CCC, September 16, 2009
6. ^ Re: undo move vs. Position Cloning by Don Dailey, CCC, September 16, 2009

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