[Retros] Retractor 2.0 now available online

Thomas Brand t.brand at gmx.net
Sat Apr 10 04:29:53 EDT 2021

Hi Ted,

That’s extremely good news — thank you very much!

See https://www.thbrand.de/2021/04/10/retractor-2-0/ <https://www.thbrand.de/2021/04/10/retractor-2-0/>

Best wishes,

Thomas Brand
thomas at thbrand.de <mailto:thomas at thbrand.de>

> Am 10.04.2021 um 07:56 schrieb Theodore Hwa <hwatheod at cs.stanford.edu>:
> 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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> Retros at janko.at
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