Search found 400 matches

by Ralph Stoesser
Sun Feb 22, 2015 8:19 am
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

I do understand it, now that you explained it. The same position ensues in the transposition table regardless of how you got there. Right. We can't manage different scores for the same position dependent on how we get there. That would clash with how the hash table works. Therefore every idea in th...
by Ralph Stoesser
Sat Feb 21, 2015 10:09 am
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

:shock: Search tuned for closed positions? Of course never, since nobody even knows what a closed position is. I believe the search should be more selective and deep in closed positions, but how to achive this, by eval or by search or both, is not obvious to me. But, since the weather is so fine her...
by Ralph Stoesser
Sat Feb 21, 2015 8:16 am
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

It is not possible, because of technical reasons. The transposition table requires to stay path independent. In TT we store a position and a value for the position, independent of the move sequence (=path) that leads to the position, hence the name transposition table. I'm not sure you understand it...
by Ralph Stoesser
Sat Feb 21, 2015 7:19 am
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

Eval has no clue about the last move made. That's search, but because of the hash table we have to stay path independent. If you teach a human about this chain pattern it will work because a human is able to recognize the pattern even when there is no exact match. He will "smell" something. Engine i...
by Ralph Stoesser
Fri Feb 20, 2015 11:18 pm
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

Carl, of course I agree that black's tactical chances after c2-c3 should easily outweight the pointy chain bonus, but that's mainly because of search not because of eval. Second, and this is much more important, forget black's counter chances for a minute and only look at the white's pieces. Do you ...
by Ralph Stoesser
Fri Feb 20, 2015 9:09 am
Forum: Computer Chess Club: General Topics
Topic: The strongest passer
Replies: 56
Views: 8900

Re: The strongest passer

jorose wrote:White would never play c3 if black can reply b3, that would be completely irrational.
As a side note, c3 leads to the famous "pointy chain"! :) He might wanted to grab that nice attacking bonus (+40cp minimum?) for himself with playing c3. Might be a hint to think again about that static rule...
by Ralph Stoesser
Thu Feb 19, 2015 1:02 am
Forum: Computer Chess Club: General Topics
Topic: Kingside fianchetto
Replies: 43
Views: 4659

Re: Kingside fianchetto

Opening a command line window and starting an executable is not exactly programming. It was just a proposal, you don't have to do anything. Regarding me, I have no time to code something for SF at the moment. I would like to because I see many nice things to try atm! Sigh. Best wishes!
by Ralph Stoesser
Thu Feb 19, 2015 12:50 am
Forum: Computer Chess Club: General Topics
Topic: Kingside fianchetto
Replies: 43
Views: 4659

Re: Kingside fianchetto

The directed pawn chain rule is very specific and complex, rather difficult to implement and will probably slow down the eval considerably. It is a rule about closed positions where engines don't understand much in general so far. As a chess playing entity myself I meanwhile have the feeling there m...
by Ralph Stoesser
Thu Feb 19, 2015 12:05 am
Forum: Computer Chess Club: General Topics
Topic: Pawn defence
Replies: 15
Views: 2213

Re: Pawn defence

Supporting a queen by a pawn isn't irrelevant in case the opponent also threatens with the queen. Same for the rook if it is threatened by a queen or rook. What you say about bishop mobility makes sense to me, but overall I think it is not a bad idea at all. In fact in SF there is such a bonus and i...
by Ralph Stoesser
Wed Feb 18, 2015 10:58 pm
Forum: Computer Chess Club: General Topics
Topic: Kingside fianchetto
Replies: 43
Views: 4659

Re: Kingside fianchetto

Carl, everybody is free to fork SF and to do exactly what you think should be done. But for sure it will not happen with the official version. Especially not until the Elo rat race isn't finally decided. Taking steps back only because of so called human knowledge is very risky. You would never know ...