Search found 285 matches

by Fabien Letouzey
Mon Sep 09, 2019 12:57
Forum: Draughts, Computer, Internet
Topic: Unofficial World Championships Of Computer Programs Rapid 2019
Replies: 41
Views: 2086

Re: Unofficial World Championships Of Computer Programs Rapid 2019

Ed Gilbert wrote:
Mon Sep 09, 2019 12:09
What is the end position of that game?
I don't have it; the game has been replaced.
by Fabien Letouzey
Mon Sep 09, 2019 08:56
Forum: Draughts, Computer, Internet
Topic: Unofficial World Championships Of Computer Programs Rapid 2019
Replies: 41
Views: 2086

Re: Unofficial World Championships Of Computer Programs Rapid 2019

While I was also surprised by the result, Krzysztof might be correct in his decision. Who knows, maybe 5 kings are not enough against 2 (!); I didn't know that. Scan's score alone cannot be trusted in the specific case of endgames with many kings. The reason is that Scan has learned from improved dr...
by Fabien Letouzey
Wed Jul 24, 2019 18:41
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 6
Views: 462

Re: "pretend solving" 10x10 variants on a 8x8 board

How big are your books for BT and LD? With 8 piece dbs you might see to the end of the game. They are tiny in comparison: about 5k for BT and 20k for LD (internal nodes). But I think that it can be misleading: you can compensate for a small book by having a better leaf "evaluation". Last week I act...
by Fabien Letouzey
Wed Jul 24, 2019 17:36
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 6
Views: 462

Re: "pretend solving" 10x10 variants on a 8x8 board

(losing draughts only) Usually a single computation step, expanding a leaf (whose position is displayed), takes about a minute. And, while I was watching the "alternative move" search (which excludes 24-20), many steps in succession only took a second, with long lines (about 40 plies, and normal sea...
by Fabien Letouzey
Wed Jul 24, 2019 09:47
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 6
Views: 462

Re: "pretend solving" 10x10 variants on a 8x8 board

Interesting stuff! Can you post the PVs for both games? Yes. BT: 22-18 11-15 18x11 8x15 21-17 7-11 17-13 9-14 23-19 11-16 LD: 24-20 9-13 28-24 13-17 21x14 10x17 22x13 5-9 20-16 12x28 25-22 8-12 22-18 11-16 18-14 9x18 23x14 6-10 27-23 10x17 13x22 1-5 I stopped showing them, because I think that the ...
by Fabien Letouzey
Wed Jul 24, 2019 08:12
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 6
Views: 462

Re: "pretend solving" 10x10 variants on a 8x8 board

Hi all, Just an update on the computation. With the heat wave coming at full strengh, I will probably stop it and consider the project as completed. Breakthrough: 22-18 +877 22-17 -461 24-19 -464 23-18 -479 21-17 -498 24-20 -510 23-19 -527 Losing draughts: 24-20 +550 23-18 +0 22-18 -148 21-17 -172 2...
by Fabien Letouzey
Sat Jul 20, 2019 09:48
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 6
Views: 462

"pretend solving" 10x10 variants on a 8x8 board

Hi all, This is mostly for programmers. As some of you know, Scan has recently been extended to support more 10x10 variants, now totalling 5: international draughts (ID), killer draughts (KD), Breakthrough draughts (BT), Frisian draughts (FD), and losing draughts (LD). The last one is also called an...
by Fabien Letouzey
Sat Jul 06, 2019 15:08
Forum: Draughts, Computer, Internet
Topic: Scan
Replies: 164
Views: 62035

Re: Scan

Hi all, Scan 3.1 (and the corresponding Hub 2.1) is now available on Harm Jetten's website: http://hjetten.home.xs4all.nl/scan/scan.html Many thanks to him! The main addition in this version are two new variants: Frisian draughts and losing draughts (aka antidraughts/giveaway/suicide). This complete...
by Fabien Letouzey
Tue Jun 25, 2019 12:33
Forum: Draughts, Computer, Internet
Topic: Scan 3.0
Replies: 18
Views: 5701

Re: Scan 3.0

Krzysztof Grzelak wrote:
Tue Jun 25, 2019 10:10
Hi Fabien.
I have a request for you. Can you write what will be the new version of the Scan. I am asking because he is preparing for a new tournament and would like to enter a new version of the program. Of course, if it's not a secret.
3.1
by Fabien Letouzey
Tue Jun 18, 2019 08:11
Forum: Draughts, Computer, Internet
Topic: Scan 3.0
Replies: 18
Views: 5701

Re: Scan 3.0

Please write if there is a new version of the program Scan - Scan 3.04. Hi Krzysztof, As a matter of fact, yes. I have implemented additional draughts variants: Frisian and losing (bringing the total number of variants to 5), and am preparing a release. There are also a handful of small changes tha...
by Fabien Letouzey
Sun Jan 13, 2019 16:53
Forum: Draughts, Computer, Internet
Topic: AMD - Scan 3.0 - Problem
Replies: 18
Views: 4487

Re: AMD - Scan 3.0 - Problem

Hi Krzysztof,
Krzysztof Grzelak wrote:
Sun Jan 13, 2019 14:07
Hi Fabien.
I have such a request for you. Can you help me set up Scan 3.0 for the tournament. My equipment is:
...
I am guessing that you are referring to the number of threads. Let's try 8; in any case you should never use more than that (I only have 4).

Fabien.
by Fabien Letouzey
Wed Nov 21, 2018 07:44
Forum: Draughts, Computer, Internet
Topic: DXP Scan
Replies: 4
Views: 1578

Re: DXP Scan

Thank you for your answer Fabien. I have such an important question. Please write whether Scan 2.0 and 3.0 have a book 2move ballots and 3move ballots. I'm going to think about this question. Like you, Fabian, you tested both versions with each other. Scan does not support move ballots. You can org...
by Fabien Letouzey
Mon Nov 19, 2018 08:03
Forum: Draughts, Computer, Internet
Topic: DXP Scan
Replies: 4
Views: 1578

Re: DXP Scan

I have a question. How to play a dxp game consisting of 158 games using the Scan 2.0 and Scan 3.0. I thank you in advance for all the information. Hi Krzysztof, As far as I know, you can't. But it's important to know why, and I explain it below. What you can do, however, is to use random book moves...
by Fabien Letouzey
Wed Jul 04, 2018 07:43
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 6469

Re: maximum niumber of legal moves

Fabien is right: for a computer constructing proof games seems quite hard. In my program, I do check for illegal position in the constructor (see: http://laatste.info/bb3/viewtopic.php?t=7693) but only for immediate conflicts (overlapping squares or men on the promotion line). The indirect conflict...
by Fabien Letouzey
Mon Jul 02, 2018 10:09
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 6469

Re: maximum niumber of legal moves

I agree with the other criteria, but not this one. Draughts programs are not just used for games, but also to check composed positions for correctness (that's the main usage for me at least). And a composed position can have more than 20 pieces of one side. That certainly seems arbitrary, but older...