[Retros] Retractor 2.0 now available online

[Theodore Hwa]

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
>       _______________________________________________
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> 
> 
> 
> --
> Alexander George
> Department of Philosophy
> Amherst College
> Amherst, MA 01002
> USA
> alexandergeorge.net
> 
> 
>