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Subject: Re: Does your program understand castling/en passant rights on 3x repetition

Author: Daniel Clausen

Date: 08:19:04 02/27/00

Hi

On February 27, 2000 at 00:15:14, Richard A. Fowell (fowell@netcom.com) wrote:

>I noticed today that six of the seven chess programs that I tried
>(three freeware, four commercial) failed to pass the two tests below.
>
>(my congratulations to Will Bryant, who programmed Screamer right!)
>
>The others don't understand how castling rights and en passant capture
>rights effect the ability to claim draw by three-fold repetition of position.
>
>The FIDE Laws of Chess (1997, but unchanged from when I learned chess 26 years
>ago) say:

[snip]
>#1 Check for knowledge of castling rights on triple repetition draw =
>
>1. Nf3 Nf6
>2. Rg1 Rg8
>3. Rh1 Rh8   (second occurrence of this visible piece pattern, but first
>occurrence w/o castling rights)
>4. Rg1 Rg8
>5. Rh1 Rh8 ( No draw, yet - this is the original piece pattern, but there
>             both sides had castling rights. To put it another way, the EPD
>             strings for the starting position and this one are different.)
>6. Rg1 Rg8 - draw by triple repetition of position.
>
>#2 Check for knowledge of en passant opportunity of triple repetition draw =
>
>1.  a4  a6
>2.  a5  b4
>3. Nf3 Nf6
>4. Ng1 Ng8 (second occurrence of this visible piece pattern, but first
>occurrence w/o en passant capture option)
>5. Nf3 Nf6
>6. Ng1 Ng8 (again, no draw yet - there is no en passant capture possible here,
>            as there was after Black's second move).
>7. Nf3 - draw by triple repetition of position.

>Which chess programs (other than Screamer) get these right?

Not that anyone cares, but my engine gets these right. :) But only
if blacks 2nd move in the 2nd mini-game is b5. (instead of b4)

Kind regards,
 -sargon

What approach do you use to handle castling/en passant for repetition? Richard A. Fowell (fowell@netcom.com) 11:03:11 02/27/00
- Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 15:00:32 02/27/00
  - Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 00:25:09 02/28/00
    - Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 05:49:06 02/28/00
      - Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 06:17:48 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 10:51:25 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 13:20:21 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 13:53:45 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 08:34:53 02/29/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 14:56:25 02/29/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 02:19:38 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Peter Kappler 09:31:52 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? blass uri 11:31:40 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 15:26:44 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Michael White 06:13:16 03/03/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Michael White 09:20:07 03/03/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Daniel Clausen 12:55:39 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 15:32:33 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 05:56:39 03/01/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Tom Kerrigan 08:37:22 02/29/00
        
        Re: What approach do you use to handle castling/en passant for repetition? William Bryant 14:04:13 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 19:02:27 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Bruce Moreland 17:28:56 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 19:04:05 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Dann Corbit 19:33:18 02/28/00
        
        Re: PGN (inc. FEN, EPD) being revised? Dave Gomboc 00:28:07 02/29/00
        
        Some thoughts about *not hashing* ep at all.... Andrew Dados 18:28:28 02/28/00
        
        Re: Some thoughts about *not hashing* ep at all.... Robert Hyatt 19:10:56 02/28/00
        
        Re: Some thoughts about *not hashing* ep at all.... Andrew Dados 19:48:25 02/28/00
        
        Re: Some thoughts about *not hashing* ep at all.... Robert Hyatt 14:57:51 02/29/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Daniel Clausen 15:01:44 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Eugene Nalimov 13:28:58 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Andrew Dados 14:22:41 02/28/00
        
        Re: What approach do you use to handle castling/en passant for repetition? Robert Hyatt 10:53:36 02/28/00
- Re: What approach do you use to handle castling/en passant for repetition? Daniel Clausen 11:31:59 02/27/00

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