[Retros] Eero Bonsdorff - 80

[Joost de Heer]

> >what *is* a mathematical chess problem?



>	this is a sample ...

>	http://www.cs.utexas.edu/users/xli/prob/p10/p10.html


Another nice example is: http://janko.at/Retros/Schwalbe/N172.htm#10106

Joost

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