[Retros] Retractor 2.0 now available online

[Norbert Geissler]

I tested the URL below a minute ago.

http://xenon.stanford.edu/~hwatheod/retractor2/retractor.html

It does work ...

Norbert

On 10.04.21 22:23, Theodore Hwa wrote:
> Make sure you use http:// and not https:// (and make sure you don't have 
> a browser setting that automatically changes http to https).
> 
> Ted
> 
> On Sat, 10 Apr 2021, Alexander George wrote:
> 
>> Hi.  I keep getting the message:
>>
>> The requested URL /~hwatheod/retractor2/retractor.html was not found 
>> on this server.
>>
>> On Sat, Apr 10, 2021 at 1:56 AM Theodore Hwa 
>> <hwatheod at cs.stanford.edu> wrote:
>>       Hello retro enthusiasts,
>>
>>       Retractor 2.0 is now available online as an application in your 
>> browser at
>>
>>       http://xenon.stanford.edu/~hwatheod/retractor2/retractor.html
>>
>>       For those not familiar, Retractor is a program for exploring retro
>>       problems. It lets you setup a position and play backwards from 
>> it, and
>>       warns you if it detects an illegal position.  It reports the 
>> number of
>>       captures and promotions in a position. It can also solve some 
>> "Last N
>>       moves" problems.
>>
>>       For those of you who have been around this list for a while, 
>> Retractor 2.0
>>       is the successor of Retractor 1.0 which was a Windows application
>>       developed by myself and Chad Whipkey in 1998.
>>
>>       Right now, Retractor 2.0 is pretty much a straight port of 
>> Retractor 1.0
>>       to Javascript. I hope to improve its abilities in the future. The
>>       immediate items for improvement are (1) taking promotions into 
>> account
>>       when counting pawn captures, and (2) a more general method for 
>> detection
>>       of illegal retro-cages (right now, some common cases are 
>> hard-coded).
>>
>>       I am using the "Last Single Move" problems (types A-D) at
>>       https://www.janko.at/Retros/Records/LastMove/index.htm as 
>> benchmarks for
>>       improving Retractor. When going through those problems, I found 
>> that when
>>       Retractor cannot solve one of them, it's usually because of (1) 
>> and/or
>>       (2).
>>
>>       If you are interested in the source code, it is available on 
>> github at:
>>       https://github.com/hwatheod/retractor
>>
>>       Any and all feedback, comments, contributions for Retractor are
>>       appreciated! You can contact me at this email address, or on the 
>> github
>>       page above.
>>
>>       Thanks,
>>
>>       Ted Hwa
>>       _______________________________________________
>>       Retros mailing list
>>       Retros at janko.at
>>       https://pairlist1.pair.net/mailman/listinfo/retros
>>
>>
>>
>> -- 
>> Alexander George
>> Department of Philosophy
>> Amherst College
>> Amherst, MA 01002
>> USA
>> alexandergeorge.net
>>
>>
>>
> 
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-- 
...for chess, that superb, cold, infinitely satisfying anodyne to life,
I feel the ardour of a lover, the humility of a disciple.
(Herbert Russell Wakefield)