zanzibar: <RB> thanks for looking into that.
Turns out that the right Gonzalez is this one:
Dr. Juan Carlos Gonzalez de Vega
According to I.A. Horwitz, who published many games from the <1e Capablanca Memorial> during the summer of '62. Horwitz said he was very well known in the chess circles having recently won the US Speed Chess Championship (also, see e.g. 52nd US Open (1951))
As for Siero, the identity of that person is much less clear. I found a pretty detailed site, having a good xtab with nicely identified players:
They have Siero as <Siero> in the xtab, but later identify him as
in his game against Pachman.
There is mention of a Marcelino Siero winning an amateur S. Cal tournament here: http://www.chessdryad.com/articles/...
There are other chess hits from Cuba on the web, but are stale, without cache being viewable beyond the google search:
<Entre los años 1932 a 1936 el club de ajedrez Capablanca de Artemisa llena una ... jugadores Marcelino Siero y Juan Corzo, ex campeón de Cuba este último.>
Oh, got a definitive hit:
So, it's definitely is <Siero, Marcelino>
* * * * *
Anyways, looks like Di Felice is wrong on tournament, as regards Gonzalez, and incomplete, as regards Siero. As are NIC and CB as well.
Honestly, it's trouble enough trying to keep <CG> honest!