Castagna - Feldmann, Zurich 1958. Rothwell's BQ3

After reading a batgirl's blog on Elaine Rothwell's chess art, I've seen an etching with the title BQ3 [=Bd3]. It was inspired by white's 29th move from a game played by Castagna and Feldmann in Zurich in 1958. The artist had depicted the Byrne vs Fischer, 1956, in another piece; so who were those guys? I couldn't track some great info; only that one player should be Rino Castagna, a leading chess player in Biel for the following years.

I've found the position analyzed in some publications, like in Chess Voice 1978, 7, in the Dutch newspaper Het vaderland of 21.06.1958, and in the Imagination in Chess by Paata Gaprindashvili, #445. However, I've finally found the whole game in...

It should be from a clubs' championship played in Zurich during Jan-Feb 1958; but can't be sure. Besides the position, the whole game seemed beautiful...

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And a shorty I've made

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.... thanx for reading