ChessDBCN

Discussion of anything and everything relating to chess playing software and machines.

Moderators: bob, hgm, Harvey Williamson

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Ratosh
Posts: 71
Joined: Mon Apr 16, 2018 4:56 pm

Re: ChessDBCN

Post by Ratosh » Sat Sep 14, 2019 3:18 pm

Hello,

This is a great tool! I'm trying to do tools around it and i found something odd, nodes above 50 move rule:

https://www.chessdb.cn/cdb.php?action=q ... 0258%20159

Leo
Posts: 836
Joined: Fri Sep 16, 2016 4:55 pm
Location: USA/Minnesota
Full name: Leo

Re: ChessDBCN

Post by Leo » Sat Sep 14, 2019 4:34 pm

I wonder who is paying the cost of doing this. I haven't read the whole postings yet.
Advanced Micro Devices fan.

noobpwnftw
Posts: 360
Joined: Sun Nov 08, 2015 10:10 pm

Re: ChessDBCN

Post by noobpwnftw » Sat Sep 14, 2019 4:53 pm

Ratosh wrote:
Sat Sep 14, 2019 3:18 pm
Hello,

This is a great tool! I'm trying to do tools around it and i found something odd, nodes above 50 move rule:

https://www.chessdb.cn/cdb.php?action=q ... 0258%20159
It ignores move counters entirely and rules may be handled on the client side.
Reason being for sake of rule completeness it must also consider 3-fold rule which would require probing to send all history moves, which is undesired.

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Ovyron
Posts: 2713
Joined: Tue Jul 03, 2007 2:30 am

Re: ChessDBCN

Post by Ovyron » Wed Sep 18, 2019 6:47 am

I wonder how strong ChessDB is, and how would it play a correspondence game. I'm able to outpace it steadily when analyzing in parallel, but then I go to sleep, and waking up means it has already outpaced me greatly, so the biggest advantage is champing non-stop.
Great spirits have always encountered violent opposition from mediocre minds.

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Ovyron
Posts: 2713
Joined: Tue Jul 03, 2007 2:30 am

Re: ChessDBCN

Post by Ovyron » Sun Sep 29, 2019 7:16 am

I've just managed to feed my mainline for 1.e4 and made it its preferred choice :)

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O

On this position 8.c3?? is 0.00 as it allows 8...d5!! and no matter what white plays, it can't make progress. 8.c3 was ChessDBCN's top move:

Image

After feeding it the relevant lines that busted its main defenses, ChessDBCN now admits that 8.a4!! is best!

Image

This has the unexpected ripple effect of making it unsure about what's the best reply against 1.e4. Before this, ChessDB thought 1...e5 was best:

Image

After this 1...e5 and 1...c5 are tied, though it was c5's score that went up...

Image

So yeah, if you have a strong mainline you can make it ChessDBCN's favorite 8-)
Great spirits have always encountered violent opposition from mediocre minds.

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