Search found 3252 matches

by Sven
Wed Jun 26, 2019 4:45 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: tuning for the uninformed
Replies: 48
Views: 10760

Re: tuning for the uninformed

Something I forgot to ask: for totalError += pow(value_from_fen - calculateSigmoid(eval_score), 2); value_from_fen = 1.0 for 1-0, 0.0 for 0-1 and so on but eval_score, should it be from the point of view of the fen-string? or from white? or...? Obviously the sigmoid function (and therefore also eva...
by Sven
Mon Jun 24, 2019 7:20 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: CCRL scaling versus human player
Replies: 24
Views: 680

Re: CCRL scaling versus human player

Here is the top endgame player of all time Carlsen blundering a 5 pieces endgame ==> https://www.youtube.com/watch?v=5b-1u5XjaFU This is OT of course but in the video I only see KRBPPP vs KRBPPP positions, that is 12 pieces. What did I miss? You missed the moment when Carlsen blundered which was at...
by Sven
Mon Jun 24, 2019 7:02 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: 74th Amateur Series Division 7
Replies: 13
Views: 403

Re: 74th Amateur Series Division 7

Congratulations to David (Orion author) on the tournament victory and promotion into Division 6 of the next series. :) Congrats to David from me as well :-) The outcome was very close in the end, Jumbo almost made it ... Thanks to all who took an interest in this tournament. It was nice seeing some...
by Sven
Sun Jun 23, 2019 8:08 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: CCRL scaling versus human player
Replies: 24
Views: 680

Re: CCRL scaling versus human player

Chessqueen wrote:
Sun Jun 23, 2019 6:09 pm
Here is the top endgame player of all time Carlsen blundering a 5 pieces endgame ==> https://www.youtube.com/watch?v=5b-1u5XjaFU
This is OT of course but in the video I only see KRBPPP vs KRBPPP positions, that is 12 pieces. What did I miss?
by Sven
Thu Jun 20, 2019 9:09 pm
Forum: Computer Chess Club: General Topics
Topic: Who does chess programming wiki?
Replies: 6
Views: 403

Re: Who does chess programming wiki?

I recently in a search of Pulsar chess in google noticed chess programming wiki has a pulsar page, https://www.chessprogramming.org/Pulsar Who does this site? this Norbert's site? One of the main contributors of the CPW site is Gerd Isenberg. You can click on "View history" for each single page to ...
by Sven
Thu Jun 20, 2019 8:49 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: DTM50
Replies: 39
Views: 3374

Re: DTM50

Sven: i talked with noobpawnftw and he said: distance to mate and rule 50 are contradicting things, they don't work together. You reach a position with rule counter = 49 for example, apply dtm50(which assumes rule counter = 50) gives you imperfect moves. So basically you need DTM1~DTM50 to play per...
by Sven
Thu Jun 20, 2019 4:01 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: DTM50
Replies: 39
Views: 3374

Re: DTM50

After noobpawnftw told me that dtm50 is not perfect. [...] DTM50 is both bulky and troublesome compared to DTM. What exactly is "not perfect" and "troublesome" with DTM50? DTZ50 may be perfect in theory, but it suffers from a laughable practical quirk. You refer to DTZ50. But your previous claim wa...
by Sven
Thu Jun 20, 2019 8:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: DTM50
Replies: 39
Views: 3374

Re: DTM50

Nordlandia wrote:
Wed Jun 19, 2019 11:11 pm
After noobpawnftw told me that dtm50 is not perfect. [...] DTM50 is both bulky and troublesome compared to DTM.
What exactly is "not perfect" and "troublesome" with DTM50?
by Sven
Tue Jun 18, 2019 7:55 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: strange code for tt
Replies: 9
Views: 562

Re: strange code for tt

if alpha > start_alpha (which is the alpha at the start of search()), then the best_score can never be <= start_alpha. That depends on your type of alpha-beta search. With "fail hard" you are right but with "fail soft" best_score is initialized to -INF and can certainly be below your current window...
by Sven
Sun Jun 16, 2019 4:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Explanation of the Cute Chess message 'connection stalls'
Replies: 15
Views: 517

Re: Explanation of the Cute Chess message 'connection stalls'

For iterative deepening, I understand what it is but I have to figure how to do it. For now, I use a recursive function. Iterative deepening is a concept one level above the tree search itself. The latter can be implemented recursively or iteratively. int search(Board b, int d, int alpha, int beta,...