Perhaps best-known is the Keres Attack against the Scheveningen Variation of the Sicilian Defence ( 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g4 ), which was successfully introduced against Efim Bogolyubov at Salzburg 1943, and today remains a topical and important line.

But he handled everyone else: Miguel Najdorf (+ 3 = 5-3 ); Savielly Tartakower (+ 2 = 4-1 ); Salo Flohr (+ 2 = 7-0 ); Grigory Levenfish (+ 1 = 0-0 ); George Alan Thomas (+ 2 = 3-0 ); Erich Eliskases (+ 1 = 2-0 ); Viacheslav Ragozin (+ 1 = 1-0 ); Vladimirs Petrovs (+ 2 = 1-1 ); Efim Bogolyubov (+ 1 = 1-0 ); Jan Foltys (+ 2 = 0-0 ); Salo Landau (+ 4-0 = 1 ); George Koltanowski (+ 2 = 1-0 ); Igor Bondarevsky (+ 1 = 0-0 ); Géza Maróczy (+ 1 = 0-0 ); William Winter (+ 4 = 0-0 ); Ernst Gruenfeld (+ 1 = 0-0 ); Gideon Stahlberg (+ 4 = 5-2 ); Andor Lilienthal (+ 1 = 0-0 ); László Szabó (+ 0 = 1-0 ); Vladas Mikėnas (+ 1 = 1-0 ); Rudolph Spielmann (+ 0 = 1-0 ); and Conel Hugh O ' Donel Alexander (+ 1 = 3-0 ).

This included wins against Flohr and Akiba Rubinstein, and draws with Alekhine, Kashdan, Ernst Grünfeld, Gideon Ståhlberg, and Efim Bogolyubov.

* Efim Bogoljubov vs Aron Nimzowitsch, San Remo 1930, NimzoIndian Defence, Bogoljubov Variation ( E23 ), 0 – 1 Another encounter of hypermodern heavyweights sees Nimzowitsch with two knights in the endgame, and he handles them perfectly.

Efim Bogoljubov, who had emigrated from the Soviet Union to Germany, was not entered in the first class of Grandmasters, even though he had played two matches for the World Championship with Alekhine.

Petrosian successfully defended his title beating Spassky, a feat that had not been accomplished since Alexander Alekhine defeated Efim Bogoljubov in the 1934 World Chess Championship.

Other notable grandmasters against whom he had plus records include Fine, Flohr, Viktor Korchnoi, Efim Geller, Savielly Tartakower, Mark Taimanov, Milan Vidmar, Svetozar Gligorić, Isaac Boleslavsky, Efim Bogoljubov and Bent Larsen.

In 1929 and 1934, Kmoch served as Alexander Alekhine's second in his world championship matches against Efim Bogoljubov.

Playing Hastings for the first time in 1950 / 51, he beat the French champion Nicolas Rossolimo and at Southsea in 1950, defeated both Efim Bogoljubov and Savielly Tartakower.

!, popular in the nineteenth century and revived by Efim Bogoljubov in the twentieth, is still played occasionally, but Black obtains a strong attack after either 8 ... h6!

After 3. Nf3, Black usually plays 3 ... b6 ( the Queen's Indian Defence ) or 3 ... d5 ( leading to the Queen's Gambit Declined ), but can instead play 3 ... Bb4 +, the Bogo-Indian, named after Efim Bogoljubov.

But Maróczy's defensive style was often more than sufficient to beat the leading attacking players of his day such as Joseph Henry Blackburne (+ 5 − 0 = 3 ), Mikhail Chigorin (+ 6 − 4 = 7 ), Frank Marshall (+ 11 − 6 = 8 ), David Janowski (+ 10 − 5 = 5 ), Efim Bogoljubov (+ 7 − 4 = 4 ) and Frederick Yates (+ 8 − 0 = 1 ).

For that, Lasker was invited to participate in the legendary New York 1924 chess tournament, a double round robin featuring such world class players as Alekhine, Efim Bogoljubov, Capablanca, Emanuel Lasker, and Réti.

Success often came in individual encounters with his more distinguished peers ; he won impressive games against José Raúl Capablanca, Akiba Rubinstein, Max Euwe and Efim Bogoljubov as well as a short match with Edgard Colle in 1922.

Below is a sample game that features the unusual feat of Grandmaster Efim Bogoljubov beating Diemer with his own favorite opening:

# REDIRECT Efim Bogoljubov

He received the Ukrainian chess grandmaster Efim Bogoljubow at Wawel castle.

This form has never attracted serious interest in high-level play, though Alexander Alekhine defeated Efim Bogoljubow with it in one game of their second match, in 1934.

In July 1932, he tied for 5th-6th with Efim Bogoljubow in Bern.

In 1925, he tied for fifth / sixth place with Savielly Tartakower in Moscow ( Efim Bogoljubow won ).

* 1955 – Efim Zelmanov, Russian mathematician

* September 7 – Efim Zelmanov, Russian mathematician

Also at Riga, he defeated Efim Geller with mating attacks, winning by 5½ – 2½ (+ 3 − 0 = 5 ).

* Boris Spassky vs Efim Geller, Sukhumi Candidates ' match 1968, game 6, Sicilian Defence, Closed Variation ( B25 ), 1 – 0 One of three beautiful wins by Spassky over Geller in this match using the same variation, which is one of Spassky's favorites.

* Vasily Smyslov vs Efim Geller, USSR Championship, Moscow 1951, Sicilian Defence, Closed Variation ( B26 ), 1 – 0 Smyslov used the Closed Sicilian periodically throughout his life, and made many important improvements.

* Curaçao 1962, tied 2nd – 3rd, with Efim Geller, half a point behind Tigran Petrosian, with 17 / 27 (+ 9 = 16 − 2 ).

He won a playoff match for alternates, an eventual third-place Candidates ' position, against Efim Geller by 5 – 4 at Copenhagen 1966.

At Monte Carlo 1967, he shared 3rd – 4th with 6 / 9, behind Fischer and Efim Geller.

* Efim Telepnev 1626 – 30

Efim Petrovich Geller (, ; March 8, 1925 – November 17, 1998 ) was a Soviet chess player and world-class grandmaster at his peak.

* Efim Geller ( 1925 – 1998 ), Soviet chess player

One ostensible example of these reputed powers was when Efim Rasputin, Grigori's father, had one of his horses stolen and it was claimed that Rasputin was able to identify the man who had committed the theft.

In his first attempt at the Soviet Championship final, the 22nd in the series, held in Moscow 1955, Spassky tied for third place with 11½ / 19, after Smyslov and Efim Geller, which was sufficient to qualify him for the Gothenburg Interzonal later that year.

The case of arbitrary exponent has been completely settled in the affirmative by Efim Zelmanov, who was awarded the Fields Medal in 1994 for his work.

Efim Geller was an early proponent of this move, after which Black can stay in " pure " Najdorf territory with 6 ... e5 or transpose to the Scheveningen with 6 ... e6.

Portisch qualified from the Petropolis Interzonal 1973, scoring 11. 5 / 17 for a shared second / fourth place ( the winner was Henrique Mecking ), then surviving a further three-man playoff for two berths against Lev Polugaevsky and Efim Geller, at Portorož 1973, by winning outright with 5. 5 / 8 ; however, Portisch lost his first-round Candidates ' match to Tigran Petrosian in 1974, by 6-7 at Palma de Mallorca.

Boris Nemtsov was born on 9 October 1959 in Sochi to Efim Davidovich Nemtsov and Dina Yakovlevna Eidman.

Probably his best result was equal first with Gligorić, Ivkov and Lev Polugaevsky at Skopje 1969 ahead of former World Chess Champion Mikhail Botvinnik and multiple Candidate Efim Geller.

In 1968, he won matches against Efim Geller, Bent Larsen, and Viktor Korchnoi to again win the right to challenge Petrosian for the title.

In 1954 he won the USSR Chess Championship ahead of players including Mark Taimanov, Viktor Korchnoi, Tigran Petrosian, Efim Geller and Salo Flohr.

He won fifteen international tournaments, but considered sharing second place in Havana 1963, with Mikhail Tal and Efim Geller, behind Viktor Korchnoi, his best tournament result.