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MatPlus.Net Forum General A new type of defensive retracttors
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(1) Posted by Thomas Brand [Wednesday, Jan 21, 2015 21:51]

A new type of defensive retracttors

Klaus Wenda and Andreas Thoma introduced a new type of defensive retractors, a combination of the well known Proca and Høeg types. They called it, deduced from their first names, "type KLAN".

You will find the introducing article in my retroblog ( for download ( Enjoy -- and I hope you will compose some good KLAN retractors!

Have fun!

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(2) Posted by Kostas Prentos [Thursday, Jan 22, 2015 00:46]

Thank you, Thomas.

Unfortunately, the translation from German to English with Google translate is not at all accurate. The way I understand the definition, in case of a capture, White always chooses the type of the piece that was captured. White can also overrule Black's claim that a piece was captured (per Høeg definition) and decide that there was no capture (according to the only example with orthodox rules, No. K). Did I understand it correctly, or am I way off?

In any case, KLAN looks like an interesting new type of Retractor. I expect to see more examples with it in the future.
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(3) Posted by Sarah Hornecker [Thursday, Jan 22, 2015 01:37]

It combines Hoeg and Proca.
Essentially White alwazs decides what captures have happened, from what I understood.
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(4) Posted by Thomas Brand [Thursday, Jan 22, 2015 11:14]

Kostas, Siegfried, you are correct!

In KLAN White retracts according to Proca rules (i,e. decides on black pieces to be uncaptures), while Black retracts according to Hoeg rules (i.e. the opponent, White, decides about white pieces to be inserted).
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(5) Posted by Hauke Reddmann [Thursday, Jan 22, 2015 11:53]

In this case obviously a fourth type exists: Black (or put it more
succinctly, the defending side) decides all uncaptures. Seems even
more interesting to me, as Whites plans are easily foiled.

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MatPlus.Net Forum General A new type of defensive retracttors