Search found 167 matches

by OliverUwira
Wed Oct 05, 2011 3:44 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: multi-player games thoughts
Replies: 34
Views: 4357

Re: multi-player games thoughts

I am not sure what you mean by 'shallow' pruning. I don't see anything shallow in the algorithm; the deep cutoffs work as always. Unless you consider all alpha-beta pruning shallow... I was referring to backgammon engines. They usually search only 2-3 ply because the 36 possible dice rolls blow up ...
by OliverUwira
Wed Oct 05, 2011 1:47 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: multi-player games thoughts
Replies: 34
Views: 4357

Re: multi-player games thoughts

I believe what you call alpha-beta pruning in this context would generally be the elimination of dominated strategies. A strategy is dominated if there is another strategy that is at most equal for all possible outcomes of the game. If you can table the game your considering, this is easy to do, but...
by OliverUwira
Tue Oct 04, 2011 1:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: End-game evaluation
Replies: 37
Views: 9375

Re: End-game evaluation

Hello H.G., here's my two cents: Other end-games that need special treatment seem to be: Strong side has no mating potential: KBKP, KNKP (corrected to slightly negative ~-0.1) KBKPP, KNKPP (~ -0.4 ?) KBKPPP, KNKPPP (~ -0.7 ?, but not as the natural much as when the Pawn side had 4 Pawns) I'd rather ...
by OliverUwira
Thu Jan 27, 2011 5:36 pm
Forum: Computer Chess Club: General Topics
Topic: Fabien's open letter to the community
Replies: 734
Views: 513565

Re: Fabien's open letter to the community

Oh my gosh. I just take a couple of weeks of leave from computer chess and meanwhile something like this pops up... :shock:

So now here is my initial question: would there be any way to print out a complete topic or do I have to click through all of its pages?
by OliverUwira
Wed Dec 22, 2010 7:24 pm
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

I think perfect games are very rare. More than likely a perfect games would be a draw, but I suspect that most draws have imperfect moves in them. I define a perfect move as a move which does not change the game theoretic result - it does not have to necessarily be a good move from our point of vie...
by OliverUwira
Wed Dec 22, 2010 9:06 am
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

Speaking of positional queen sacrifices, anyone remember this one? Karpov - Kasparov (WCC, Lyon, 1990) [D]rnb2k2/pppq1pbp/6p1/2nNp3/2P5/5N2/PPQ1BPPP/3RK2R b K - 0 14 14...Nc6!? 15. 0-0 Ne6 16. Nb6 axb6 17. Rxd7 Bxd7 (too bad that Karpov returned the queen soon after to get rid of the black pressure)...
by OliverUwira
Tue Dec 21, 2010 11:07 pm
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

Sean Evans wrote:
OliverUwira wrote: Would you care to show one of the greatest games ever where neither side made a mistake, please? I'd really want to know...
They are called draws!
Really? With no mistakes? I'd still like to see them...
by OliverUwira
Tue Dec 21, 2010 9:58 pm
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

For the fireworks thing, I very much like Kasparov-Topalov 1999 Wijk aan Zee. That rook sacrifice is fantastic to play at that level (24 Rxd4). Here is the game: [Event "Hoogovens A Tournament (cat. 18)"] [Site "Wijk aan Zee NED"] [Date "1999.01.20"] [Round "04"] [White "Kasparov, Garry (RUS)"] [Bl...
by OliverUwira
Tue Dec 21, 2010 9:25 pm
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

For the fireworks thing, I very much like Kasparov-Topalov 1999 Wijk aan Zee. That rook sacrifice is fantastic to play at that level (24 Rxd4). Here is the game: [Event "Hoogovens A Tournament (cat. 18)"] [Site "Wijk aan Zee NED"] [Date "1999.01.20"] [Round "04"] [White "Kasparov, Garry (RUS)"] [Bl...
by OliverUwira
Tue Dec 21, 2010 9:19 pm
Forum: Computer Chess Club: General Topics
Topic: What Is The Greatest Human Chess Game Ever Played?
Replies: 49
Views: 7401

Re: What Is The Greatest Human Chess Game Ever Played?

I remember seeing a Fischer game where BF sacrificed a queen and it was impressive, because it was not some tactical shot but appeared to be completely based on positional judgement and looked like a blunder. Only after several moves did it become apparent that he knew exactly what he was doing. I ...