Diag Hubner-Portisch 1980

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<blockquote class="wp-embedded-content"><a href="http://ferreiro01.cubava.cu/2017/03/16/ajedrez-como-ciencia-impacto-de-lo-nuevo/diag-hubner-portisch-1980/">Diag Hubner-Portisch 1980</a></blockquote>
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