Search found 3305 matches

by Sven
Wed Jun 25, 2008 10:51 am
Forum: Computer Chess Club: General Topics
Topic: Is there an engine able to solve this hard one ?
Replies: 3
Views: 1360

Re: Is there an engine able to solve this hard one ?

Hi Vincent,

a nice position! Any idea why 2. Kc2, 3. h3, 4. h4 are required, i.e. why the following would not work?

1. Rd2 Rf8 2. Kb2 h6 3. Ka2 Rhg8 4. Ra7

Sorry if the answer is kind of trivial, no analysis engine available here at the moment ...

Sven
by Sven
Thu Jun 05, 2008 10:18 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Returning score
Replies: 2
Views: 1497

Re: Returning score

Hi, two different algorithms, where one is a slightly improved variant of the other: "return beta" belongs to the plain alpha-beta algorithm which may also be called "fail hard alpha-beta". When working with aspiration windows, and your search at the root node fails high with a score >= beta, then i...
by Sven
Sun Jun 01, 2008 9:45 am
Forum: Computer Chess Club: General Topics
Topic: interesting endgame position
Replies: 12
Views: 3178

Re: interesting endgame position

Ovyron wrote:Second position:
[...]
21.01 0:23 -2.09 1.b5 Rb1 2.Ke3 f6 3.gxf6+ Kxf6 4.Kf4 Rb4 5.Ke3 Ke5 6.Kd3 g5 7.Kc3 Rxe4 (1.449.758) 62
I would be interested to see Rybka's analysis after 1.b5 Rb1 2.e5 which might be an important improvement for white here IMO.

Sven
by Sven
Tue May 27, 2008 1:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Special code for black and white
Replies: 30
Views: 9121

Re: Special code for black and white

I have code similar to this: enum { White=0, Black=1 }; //... int someValue[2][BOARD_SIZE]; //... inline int someEvalFunction(int color, int sq) { //... return someValue[color][sq]; } This way I avoid both "if (color == White)" code and duplication of large code pieces. T...