[Retros] Invisible King

Mario Richter mri_two at t-online.de
Tue Feb 9 08:59:30 EST 2010

> Here is one short paper on the Invisible King genre in chess composition:

> http://chessproblem.net/viewtopic.php?f=13&t=371

For those, who are interested in the mathematical background
(and who are able to understand russian texts), there is also
available the following E-paper:

Search under counteraction
V. Yu. Andrianov, N.N.Petrov


Best regards,


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