Search found 279 matches

by Fabien Letouzey
Sat Jul 20, 2019 09:48
Forum: Draughts, Computer, Internet
Topic: "pretend solving" 10x10 variants on a 8x8 board
Replies: 0
Views: 74

"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: 163
Views: 58634

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: 5271

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: 5271

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: 4015

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: 1449

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: 1449

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: 5960

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: 5960

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...
by Fabien Letouzey
Mon Jul 02, 2018 08:57
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 5960

Re: maximum niumber of legal moves

Hi Gérard, Should my quesion have concerned non legal position I would have begun by showing the following quite simple position http://fmjd.org/dias2/save/15304635986.png 128 moves You are playing with words. For me the "obvious" properties that a position must have are: - at most one piece on a gi...
by Fabien Letouzey
Sun Jul 01, 2018 18:22
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 5960

Re: maximum niumber of legal moves

Oops if you accept illegal positions then, the position with the maximum moves in a context of men positions (no kings) is not a position with captures but simply the obvious following one :P : ... 45 moves It looks like we're having two conversations with no connections so let me clarify. In this ...
by Fabien Letouzey
Sat Jun 30, 2018 08:23
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 5960

Re: maximum niumber of legal moves

Hi Gérard, BTW in the following position http://fmjd.org/dias2/save/15302706721.png you can count 26 capture moves but this position is not legal is it? This one with a nice symmetry: 28 moves: https://toernooibase.kndb.nl/applet/oerterpapplet2.0/createdia2.php?fen=W:W8,26,30,48:B11,12,13,14,21,22,2...
by Fabien Letouzey
Wed Jun 27, 2018 08:38
Forum: Draughts, Computer, Internet
Topic: Internet engine matches
Replies: 395
Views: 128272

Re: Internet engine matches

Hi Krzysztof, Kingsrow 1.60 vs. Scan 3.0 0 wins, 0 losses, 158 draws, 0 unknowns Is that the first time that a match ends with 100% draws? :) Anyway, your tests also show what we already knew: the draw rate increases in slower games. So 2-move ballots are already too small for top programs. Fabien.
by Fabien Letouzey
Wed Jun 27, 2018 08:32
Forum: Draughts, Computer, Internet
Topic: maximum niumber of legal moves
Replies: 37
Views: 5960

Re: maximum niumber of legal moves

ildjarn wrote:https://toernooibase.kndb.nl/applet/oer ... 2&size=300
Doesn't seem to support the - for multiple pieces in a row though.
Thanks!

That's OK, it's an optional extension in my program.
by Fabien Letouzey
Mon Jun 25, 2018 15:34
Forum: Draughts, Computer, Internet
Topic: Coding issues
Replies: 10
Views: 2093

Re: Coding issues

Hi Gérard, INT64 x = 0xffffffffffffffff; No matter how many digits you put, this is a (signed) 32-bit literal. You need to append ULL (or ui64 for MS compilers) to extend that. "1 << 32" would fall into the same trap (although the compiler is allowed to do the right thing in this case), etc ... Don'...