## World Draughts Forum

### het Nieuwe Forum • Re: Salou Open 2021

het Nieuwe Forum • Re: Salou Open 2021

Dear friends,

First of all we’d like to thank everybody who reacted to our survey.

In the past months we also thoroughly analyzed the latest developments around Covid-19 (vaccination, new mutations, permissions and limitations per countries, visum problematics etc.) and collected the opinions about the possible extra edition of Salou-2021 in September.

The conclusion we finally came to is (regrettably) that we won’t organize the Salou Open in September.

There is at the moment still too much uncertainty while we are already close to these dates. We all would like to be a part of our Salou Open “as it was” without restrictions and with large international representation, therefore we just have to wait for it till May 2022.

We already see a lot of interest for Salou Open 2022 expressed from different countries and continents. And we are very excited expecting this edition to become the greatest one ever. As soon as we obtain the hotel conditions for the next year we will announce it and start the inscription.

So no Salou 2021. But most important - stay safe and healthy and we see you all in May 2022 in "our" Salou!

First of all we’d like to thank everybody who reacted to our survey.

In the past months we also thoroughly analyzed the latest developments around Covid-19 (vaccination, new mutations, permissions and limitations per countries, visum problematics etc.) and collected the opinions about the possible extra edition of Salou-2021 in September.

The conclusion we finally came to is (regrettably) that we won’t organize the Salou Open in September.

There is at the moment still too much uncertainty while we are already close to these dates. We all would like to be a part of our Salou Open “as it was” without restrictions and with large international representation, therefore we just have to wait for it till May 2022.

We already see a lot of interest for Salou Open 2022 expressed from different countries and continents. And we are very excited expecting this edition to become the greatest one ever. As soon as we obtain the hotel conditions for the next year we will announce it and start the inscription.

So no Salou 2021. But most important - stay safe and healthy and we see you all in May 2022 in "our" Salou!

Statistics: Posted by A.Presman — Tue Jun 22, 2021 00:31

### het Nieuwe Forum • Re: DamZ! 2017-2020: KNDB in transitie

het Nieuwe Forum • Re: DamZ! 2017-2020: KNDB in transitie

https://mailchi.mp/f946fce9f53a/kom-mor ... um-4786942

https://mailchi.mp/f946fce9f53a/kom-mor ... um-4786942

Statistics: Posted by Marcel Kosters — Mon Jun 21, 2021 22:10

### Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Thank you for the information pontel.

Statistics: Posted by Krzysztof Grzelak — Mon Jun 21, 2021 17:37

### Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam para MS-DOS?

Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam para MS-DOS?

Ex: The folder with the Dynamo checkers program.

mount c c:\dynamo (enter)

c: (enter)

dynamo cd (enter)

executable name > (enter)

To make it easier, put MS-DOS applications in a folder on drive C:Please write what commands to type.

Ex: The folder with the Dynamo checkers program.

**Commands:**

mount c c:\dynamo (enter)

c: (enter)

dynamo cd (enter)

executable name > (enter)

Statistics: Posted by pontel — Mon Jun 21, 2021 15:11

### Draughts, Computer, Internet • Re: Krijn Van Drie - Boase program author

Draughts, Computer, Internet • Re: Krijn Van Drie - Boase program author

Very nice graphics of this program - I wish I had it.

Statistics: Posted by Krzysztof Grzelak — Fri Jun 18, 2021 17:06

### Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Please write what commands to type.

Statistics: Posted by Krzysztof Grzelak — Fri Jun 18, 2021 17:04

### Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

It is possible to run it using the DOSBox

Statistics: Posted by igorlemasson — Fri Jun 18, 2021 15:51

### Technical • Annex 5 Appendix D (TPR) Tournament performance rating

Technical • Annex 5 Appendix D (TPR) Tournament performance rating

From annex 5 Swiss system, Appendix D.Tournament performance rating we read:

The problem can be greatly simplified by replacing the S-shaped expectation function with a linear relationship between the rating difference (D) and the score percentage (P):

This performance rating can be computed by solving a set of lineair equations.

When computed, it is easy to verify manually.

The rating is equivalent to the recursive Buchholz tie-break.

The above could be implemented as a first step.

Introduction

The tournament performance rating may be used as tie-break criterion between players with the same score, or even as first criterion more important than the final score, to decide about the final result.The easy way to calculate the tournament performance rating is by using the average rating of the opponents but given the theory of probability behind the ELO rating system it is mathematically not fully correct way to do this. The performance belonging to an average rating may be something a bit different from the average performance, especially when there is a large variation in the ratings of the opponents.The tournament performance rating should be calculated on a game by game basis.

The TPR could replace many tie-break criteria. The chance that after a few rounds the TPR for two players will be equal is negligible. However, the TPR is not yet available in, for example, Draughts Arbiter Pro. I think there are good reasons for that.Definition

The tournament performance rating is that rating for which the expected result of the player, calculated opponent by opponent,equals the realized result of the player.

- The tournament performance ratings are unique up to a factor iff the game results at hand are connected and indivisible. That is, there must always be a non-losing results path between any two players. This is not the case if one player has won or lost all his games. This is easy to see; but it can also be much more complicated as in this chess tournament: iv memorial-lobaziewicza 2007. To calculate the TPR, the underlying structure of the strongly connected components must be determined.
- Within a strongly connected component the TPR constitutes the roots of the function We(x) - W, where x is a vector of ratings, We(x) is the expected score given rating vector x, and W is the actual score.

Finding the TPR comes down to solving a system of non-linear equations as noted byWouter,

Heb je aangetoond dat TPR* uniek is? Het lijkt me een vast punt van een niet-lineair stelsel vergelijkingen...

Het is natuurlijk duidelijk dat TPR* niet uniek is, omdat in ratings alleen verschillen van belang zijn. Dus laten we zeggen uniek op een constante na.

**---> In short: determining the "real" TPR is not straight forward.**The problem can be greatly simplified by replacing the S-shaped expectation function with a linear relationship between the rating difference (D) and the score percentage (P):

- P(D) = D / 800 + 50%

This performance rating can be computed by solving a set of lineair equations.

When computed, it is easy to verify manually.

The rating is equivalent to the recursive Buchholz tie-break.

The above could be implemented as a first step.

Statistics: Posted by clp — Fri Jun 18, 2021 12:41

### Draughts, Computer, Internet • Re: The Unofficial World Championships Of Computer Programs In International Draughts Blitz 2020

Draughts, Computer, Internet • Re: The Unofficial World Championships Of Computer Programs In International Draughts Blitz 2020

I asked the author to make the program available on the facbook. Unfortunately, so far no answer.Maybe I'm wrong, but wasn't the main author of DIOS Erik van Riet Paap?

B.T.W. my engine can only run in DXP server mode, will this suffice to have it run in your tournament? Or do you need something else like a simple text based UI?

Statistics: Posted by Krzysztof Grzelak — Fri Jun 18, 2021 12:02

### Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Draughts, Computer, Internet • Re: Jean-Bernard Alemanni - Quidam for MS-DOS?

Sorry to ask if you ran it in MS DOS?

Statistics: Posted by Krzysztof Grzelak — Fri Jun 18, 2021 11:58