zanzibar: <NOTE>: this is not the Korchnoi--Najdorf (R4) Hoogovens (1971) game, that would be here:
Korchnoi vs Najdorf, 1971
<CG> is a little confused (and shouldn't have two games with the same pairings for a RR tournament).
Not sure where this game is actually from, let me check against <MillBase>:
Kaminsky, Oleg M -- Estrin, Yakov (2330)
USSR (1) USSR
1971 1-0 D38g
Perhaps this game is this?
<CT> (ChessTempo) has it as this:
Kaminsky, Oleg M (2390) vs Estrin, Yakov (2330)
Event: It (a), Wijk aan Zee NED 11/437
Opening: Queen's Gambit Declined, Ragozin Defense (D38)
<RUSbase> has it as follows:
Kaminsky Oleg M (USA) -- Estrin Yakov (RUS)
1-0 (29) D38 1971
Leningrad (Russia): Ch \"Trade Unions\" (?)
OK, that seals it.