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He contributed to early editions of the Encyclopaedia of Chess Openings and the Encyclopaedia of Chess Endings (see Chess endgame literature).
Sicilian Defence, Najdorf Variation, according to the Encyclopaedia of Chess Openings
Queen's Gambit Declined, in the classification system of the Encyclopaedia of Chess Openings
Nimzo-Indian Defence, Leningrad, main line, Encyclopaedia of Chess Openings code