"Chess" (Cassette version) for the Mattel Aquarius Computer

Here is a third party version of "Chess" for the Mattel Electronics Aquarius computer. It was created by a company in Europe after Mattel had already paid Radofin to take back the marketing rights to the Aquarius. Although Mattel had developed a Chess game for the Aquarius, it wasn't released until later, by Radofin. I believe that this cassette version was created in the interim, because the prgrammer was not aware that an "official" version was coming. There are

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