Search found 6917 matches

by Uri Blass
Fri Dec 25, 2020 5:28 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Are Aspiration Windows Worthless?
Replies: 40
Views: 2624

Re: Are Aspiration Windows Worthless?

I just run some experimentations that strongly disagree with your findings. The aspiration windows algorithm is definitely worth on my engines. I got the following results, with self play using SPRT stop condition: - Dumb : +54.2 +/- 7.3 Elo (834 games) - Amoeba : +131.6 +/- 12.2 Elo (260 games) Be...
by Uri Blass
Mon Dec 21, 2020 1:16 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: ShashChess 15.0 64-bit 4CPU Gauntlet for CCRL 40/15
Replies: 5
Views: 483

Re: ShashChess 15.0 64-bit 4CPU Gauntlet for CCRL 40/15

https://i.postimg.cc/50JQXXBy/Shash-Chess-15-0-64-bit-4-CPU-Gauntlet.jpg PGN - http://kirill-kryukov.com/chess/discussion-board/download/file.php?id=47568 I see 0 losses for snashchess 4 cpu. Is it possible to beat it in CCRL? Is there a possibility to change parameters for the opponents to make th...
by Uri Blass
Mon Dec 21, 2020 7:36 am
Forum: Computer Chess Club: General Topics
Topic: Nemorino is surprising everybody in League 1
Replies: 17
Views: 2114

Re: Nemorino is surprising everybody in League 1

Here is a position in which most human GMs will probably move its White King TO b6 and later promote, here comes the Big Surprise Nemorino after 4 minutes promote to Queen and the GUI resigned for Ethereal after taking the Queen thinking for 5 seconds :shock: https://tcec-chess.com/live.html#div=l1...
by Uri Blass
Wed Dec 16, 2020 5:15 am
Forum: Computer Chess Club: General Topics
Topic: An idea for new Handicap games for dragon
Replies: 119
Views: 8137

Re: An idea for new Handicap games for dragon

In the meantime, right now Komodo Dragon is leading at odds game at CCC. Really nice ! What are the Odds settings and where can I watch this CCC match ? https://www.chess.com/computer-chess-championship. It is an 8 engine double round robin event at ten different handicaps, starting with queen odds...
by Uri Blass
Mon Dec 14, 2020 8:42 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

Re: what is the longest tablebase mate with special properties?



This is probably mate in 11 with a single path for the winner.
The loser has a lot of option and did not calculate complexity for it.

It is not a single path to win except the first move.
by Uri Blass
Mon Dec 14, 2020 8:21 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

Re: what is the longest tablebase mate with special properties?

Examples: 2k5/8/2K5/2R5/2p5/8/8/8 w - - 0 1 This position is a mate in 3 with a single path for white for the shortest mate. complexity of it is 2 because there are 2 ways for black to respond in the first move. This is not actually a single path for White. If Black responds to 1.Rxc4 with 1... Kb8...
by Uri Blass
Mon Dec 14, 2020 8:16 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

Re: what is the longest tablebase mate with special properties?

A better fix



single path to mate in 9.

No single path to win the game because 1.Qg1+ also win the game
by Uri Blass
Mon Dec 14, 2020 8:11 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

Re: what is the longest tablebase mate with special properties?

r6R/k7/p2K4/P7/8/8/7P/8 w - - 0 1 This is mate in 9, with a single path: 1.Rxa8+ Kxa8 2. Kc7 Ka7 3. h3! Ka8 4. h4 Ka7 5. h5 Ka8 6. h6 Ka7 7. h7 Ka8 8. h8=Q+ Ka7 9. Qb8# (1... Kb7 allows mate in 6, so the complexity is only 1.) Strictly, though, the tablebases don't show at the start that 1.Rxa8+ is...
by Uri Blass
Sun Dec 13, 2020 6:26 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

Re: what is the longest tablebase mate with special properties?

No

I did not write a program to do it.

My point was that it is possible to do it.
by Uri Blass
Sun Dec 13, 2020 4:40 am
Forum: Computer Chess Club: General Topics
Topic: what is the longest tablebase mate with special properties?
Replies: 16
Views: 1660

what is the longest tablebase mate with special properties?

I define that a mate is with a single path for the winner if the winner has only one move for the shortest mate regardless of the opponent choice. I define that a win is with a single path for the winner if the winner has only one move to win the game. I define complexity of mate as the number of po...