The Big Soviet Championships

Time to do a little pruning. Three of the 58 Soviet Championships had considerably more players than the others (number of players and link to Graeme Cree's pages):-

• 36 USSR Chp06 1929 (qf1-4, 9 players each?); 6th USSR Championship, Odessa 1929
  
• 130 USSR Chp35 1967; 35th USSR Championship, Kharkov 1967
  
• 64 USSR Chp58 1991; 58th and Final USSR Championship, 1991

I excluded any player from my master list who did not advance beyond the quarterfinal in 1929, who finished lower than 26th place (8.0/13) in 1967, or lower than 22nd place (6.0/11) in 1991. Of the approximately 304 players who competed in a Soviet Championship, 91 played only in the 6th, 35th, or 58th event. Of those, 71 finished below the cutoff. This accounts for many of the more obscure names.