Denmark's greatest chess player ever, Bent Larsen, passed away Thursday evening, the 9th of September.

Danish Chess Union President Lars-Henrik Bech Hansen said for the DSU official website:

Bent Larsen was in a class and a model for an entire generation of chess masters around the world. While he was on top, he won tournaments in front of the world elite, including seven world champions, and he was in his time the only western challenger against Soviet chess domination. His importance to chess in Denmark as a chess player and inspiration is unsurpassed, and his achievements and games will forever be carved into Danish and international chess history.

The Chessdom.com team expresses condolences to Bent Larsen's family, friends, and chess fan.

This year Bent Larsen turned 75 and on the occasion of his 75th birthday the Danish Chess Union published a special issue of Chess magazine The magazine can be downloaded here.

The year 2010 was chosen in Danish chess circles as the year of Bent Larsen. Lectures on Larsen's career were organized and congratulations were sent to Argentina. Several tournaments have been held to honor Larsen, the last one played in Denmark current best player, GM Peter Heine Nielsen, a display matches over three days against the Russian star player Peter Svidler. One of the days they played b3 as first move, also known as Larsen-opening (scroll down for more information on the opening).

More details coming.

Bent Larsen

Jørgen Bent Larsen (4 March 1935 – 9 September 2010) was a Danish chess Grandmaster. He has been a six-time Danish champion, and a Candidate for the World Chess Championship on four occasions: 1965, 1968, 1971, and 1977. He won three Interzonal tournaments: Amsterdam 1964, Sousse 1967, and Biel 1976. Larsen won several dozen major international tournaments during his career, and was awarded the first Chess Oscar in 1967.

Larsen is considered to be the strongest chess player ever born in Denmark, and strongest in Scandinavia at least until the emergence of Magnus Carlsen. Since the early 1970s, he has lived for part of the year in Las Palmas and in Buenos Aires, with his Argentinian-born wife.

Larsen, who was born in Thisted in Denmark, represented Denmark twice in the World Junior Championship, in 1951 at Birmingham (placing fifth), and 1953 at Copenhagen (placing eighth). He never graduated in Civil Engineering, but decided to become a chess professional. He became an International Master at the age of 19 in 1954, from his bronze-medal performance on board one at the Amsterdam Olympiad. He won his first of six Danish Championships in 1954, and repeated in 1955, 1956, 1959, 1963, and 1964.

Larsen defeated Friðrik Ólafsson in an exhibition match at Oslo 1955 by 4.5-3.5. He won at Copenhagen 1956 with 8/9.

Larsen became an International Grandmaster in 1956 with his gold-medal performance on board one at the Moscow Olympiad. He tied for 1st-2nd places at Hastings 1956-57 on 6.5/9 with Svetozar Gligorić. At Dallas 1957, he scored 7.5/14 for a shared 3rd-4th place; the winners were Gligorić and Samuel Reshevsky.

At the 1957 Wageningen Zonal, he tied for 3rd-4th places, along with Jan Hein Donner, with 12.5/17; there were only three qualifying berths, so the two players had to dispute a playoff match. Larsen won by 3-1 over Donner at The Hague 1958 to qualify for his first Interzonal, at Portorož 1958. Larsen could score only 8.5/20 for 16th place, and was not close to qualifying. But he scored his first major individual international success by winning Mar del Plata 1958 with 12/15, ahead of William Lombardy, Erich Eliskases, Oscar Panno, and Herman Pilnik.

Larsen went into a slump beginning with the 1958 Interzonal. He tied 5th-6th in a powerful field at Zurich 1959 with 9.5/15, behind winner Mikhail Tal, Gligorić, Paul Keres, and Bobby Fischer. But Larsen placed only 4th in a middle-range field at the 1960 Berg en Dal Zonal 1960 with 5.5/9, and did not advance to the Interzonal. He recovered by sharing 1st-2nd places at Beverwijk 1961 on 7.5/9 with Borislav Ivkov. At Zurich 1961, he tied for 6th-7th places with 6/11, as Keres won ahead of Tigran Petrosian. At Moscow 1962, he shared 7th-11th places with 7.5/15 (Yuri Averbakh won).

Around this time Larsen diversified his style, switching over to risky and unusual openings in some of his games, to try to throw his opponents off balance; this led to the recovery of his form and further development of his chess. He finished 2nd at the 1963 Halle Zonal with 13/19, behind winner Lajos Portisch, to advance to the Interzonal the next year. At Belgrade 1964, he shared 5th-6th places with 10/17 (Boris Spassky won). He tied for 5th-7th places at Beverwijk 1964 on 9.5/15; Keres and Nei won. Larsen's unusual openings were on full display at the 1964 Amsterdam Interzonal, where he shared the 1st-4th places on 17/23 with Boris Spassky, Mikhail Tal, and Vasily Smyslov, advancing as a Candidate.

In the 1965 Candidates' matches, he first defeated Borislav Ivkov at Bled by 5.5-2.5, but lost in the semi-final, also at Bled by 4.5-5.5 to former world champion Mikhail Tal. He won a playoff match for alternates, an eventual third-place Candidates' position, against Efim Geller by 5-4 at Copenhagen 1966. In 1967 he won the Sousse Interzonal after Fischer withdrew, then won his first-round match against Lajos Portisch by 5.5-4.5 at Porec 1968. In Malmö, however, he lost the semi-final by 2.5-5.5 to Boris Spassky, who went on to win the title.

In 1970 he shared 2nd in the Palma de Mallorca Interzonal, on 15/23, behind Bobby Fischer. He reached his top rank in the Elo rating system at the start of 1971, equal third in the world (with Korchnoi, behind Fischer and Spassky) with a rating of 2660. He then defeated Wolfgang Uhlmann by 5.5-3.5 at Las Palmas 1971. But then he lost the semi-final 0-6 at Denver to Fischer, who also went on to win the title.

Larsen later claimed in a Kasparov.com interview (1998) that his one-sided loss to Fischer was due in part to his condition during the match: "The organizers chose the wrong time for this match. I was languid with the heat and Fischer was better prepared for such exceptional circumstances... I saw chess pieces through a mist and, thus, my level of playing was not good."

In 1973 he failed to advance from the Leningrad Interzonal; he tied for 5th-6th places with 10/17, with Anatoly Karpov and Viktor Korchnoi winning. In 1976 he won the Biel Interzonal, but lost his 1977 Candidates' match, a rematch of their 1968 encounter, to Lajos Portisch by 3.5-6.5 at Rotterdam. In the Riga Interzonal of 1979, Larsen scored 10/17 for 7th place, and did not advance.

Starting in the mid-1960s, Larsen enjoyed a very successful run in major tournaments around the world, and he and Fischer became the two strongest players outside the Soviet Union. Larsen played in a lot of strong events, at least as many as any other top player, and repeatedly finished ahead of the top Soviet players. He won at Le Havre 1966 with 9/11, ahead of Lev Polugaevsky. At Santa Monica 1966, he placed third with 10/18, behind Spassky and Fischer. He won at Havana 1967 with a powerful 15/19, ahead of a strong group which included Mark Taimanov, Smyslov, Polugaevsky, Gligoric, and Miroslav Filip. He shared 2nd-3rd places at Dundee 1967 with 5.5/8, behind Gligoric. At Beverwijk 1967, he was 4th with 8.5/15 (Spassky won). At Monte Carlo 1967, he shared 3rd-4th with 6/9, behind Fischer and Efim Geller. He shared 1st-2nd at Winnipeg 1967 with 6/9, along with Klaus Darga, ahead of Spassky and Keres. He won at Palma de Mallorca 1967 with 13/17, ahead of Smyslov, Mikhail Botvinnik, Portisch, Gligoric, and Borislav Ivkov. He was awarded the first Chess Oscar in 1967.

Somewhat unusual for the late 1960s, Larsen, as one of the world's top players, often entered large Open tournaments run on the Swiss system, and had plenty of success. He won the Canadian Open Chess Championships at Toronto 1968 and St. John's 1970. He also won the U.S. Open Chess Championships at Aspen 1968 and Boston 1970.

Larsen shared 2nd-3rd places at Palma de Mallorca 1968 with 13/17, along with Spassky; Viktor Korchnoi won. Larsen won at Monte Carlo 1968 with 9.5/13, ahead of Botvinnik, Smyslov, Vlastimil Hort, Robert Byrne, Portisch, and Pal Benko. He defeated Heikki Westerinen by 6-2 in a 1969 exhibition match at Helsinki. In a playoff match for third place in the Candidates Tournament, he defeated Mikhail Tal at Eersel 1969 by 5.5-2.5 in a rematch of their 1965 encounter. He won at Palma de Mallorca 1969 with 12/17 ahead of Petrosian, Korchnoi, Hort, and Spassky. There was a further victory at Buesum 1969 with 11/15 ahead of Polugaevsky. At San Juan 1969, he scored 9/15 for a shared 6th-7th place (Spassky won).

Larsen won at Lugano 1970 with 9.5/14, ahead of Olafsson. In the USSR vs Rest of the World match at Belgrade 1970, he played first board for the World side, ahead of Fischer, and scored 2.5/4 against Spassky and Leonid Stein. At Leiden 1970, he shared 3rd-4th places with 5.5/12, (Spassky won). He defeated Lubomir Kavalek in a 1970 exhibition match at Solingen by 6-2. He won at Vinkovci 1970 with 10.5/15, ahead of David Bronstein, Hort, and Gligoric. At Palma de Mallorca 1970, he shared 6th-7th places with 9/15 (Panno and Ljubomir Ljubojevic were joint winners). Larsen shared 8th-9th places at San Antonio 1972 on 8.5/15 (Portisch, Petrosian, and Anatoly Karpov triumphed). He won at Teesside 1972 with 11/15, ahead of Ljubojevic and Portisch. At Las Palmas 1972, he shared 2nd-3rd places on 11/15 (Portisch won).

Larsen won at Hastings 1972-73 on 11.5/15, ahead of Wolfgang Uhlmann. At Bauang 1973, he scored 6/9 for 4th place (Kavalek won). Larsen won at Grenaa 1973 in the Nordic Championship with 8.5/10. He won again at Manila 1973 with 12.5/15, ahead of Ljubojevic and Kavalek.

He represented Denmark six times in Olympiad play, always on first board, and compiled an aggregate score of 75/109 (+61 =28 -20), for 68.8 per cent, according to olimpbase.org. He always played a very high number of games, almost all of the rounds, and won three board medals, one gold and two bronzes.

* Amsterdam 1954, board one, 13.5/19 (+11 =5 -3), board bronze medal;
* Moscow 1956, board one, 14/18 (+11 =6 -1), board gold medal;
* Munich 1958, board one, 13/19 (+11 =4 -4);
* Havana 1966, board one, 11/18 (+9 =4 -5);
* Lugano 1968, board one, 10.5/18 (+8 =5 -5);
* Siegen 1970, board one, 13/17 (+11 =4 -2), board bronze medal.

In 1988 he lost a game to Deep Thought in the Software Toolworks Championship, becoming the first Grandmaster and the player with the highest Elo rating (by then 2560) to be defeated by a computer in tournament play.

Larsen has continued to play occasionally in tournaments to the present day. In 1999 he finished 7th of 10 in the Danish Championship, but in the 2000 event he was forced to withdraw when he became seriously ill with an edema, requiring brain surgery. He has played in only a few tournaments in Buenos Aires since then. He was 4th in the 2002 Najdorf Memorial knock-out. In the September 2010 FIDE list, he has an Elo rating of 2415.

Larsen opening

It is named after the Danish Grandmaster Bent Larsen. Larsen was inspired by the example of the great Latvian-Danish player and theoretician Aron Nimzowitsch (1886-1935), who often played 1.Nf3 followed by 2.b3, which is sometimes called the Nimzowitsch-Larsen Attack. It is classified under the A01 code in the Encyclopaedia of Chess Openings.

The flank opening move 1.b3 prepares to fianchetto the queen's bishop where it will help control the central squares in hypermodern fashion and put useful pressure on Black's kingside. Often, the b2 bishop is a source of recurring irritation for Black, and it should not be treated lightly.

Although Bent Larsen was initially very successful with this opening, it suffered a setback in the 1970 USSR vs. Rest of the World match in Belgrade, in which Larsen played this opening against reigning World Champion Boris Spassky; and lost in 17 moves. (It should be pointed out that of the 42 games between Spassky and Larsen, Spassky won overall with 19 wins, 6 losses, and 17 draws.) Larsen was also decisively defeated when playing this opening against Balinas at Manila 1975.

Main lines in Larsen's opening are:

* 1...e5, the Modern Variation, is the most common response, making a grab for the centre and limiting the scope of the White Bishop. Play on this line typically continues 2.Bb2 Nc6, attacking and defending the e5 pawn, respectively, and then 3.e3 d5 4.Bb5 Bd6 5.f4 is the main line.
* 1...d5, the Classical Variation, is the second most common, also making a grab for the centre and preserving the option to fianchetto the King's Bishop to oppose the White one. Here, white uses 2.Nf3 to hopefully transpose to a reversed Nimzo-Indian Defence or another Indian defence. This can also be reached by the move order 1.Nf3 d5 2.b3.
* 1...Nf6, the Indian Variation, developing a piece and not committing to a particular pawn formation just yet. 2.Bb2 and if 2...g6 then 3.e4, taking advantage of the pinned knight (e.g., not 3...Nxe4 4.Bxh8, winning a rook at the price of a pawn).
* 1...c5, the English Variation, retaining the options of ...d5, or ...d6 followed by ...e5. 2.c4 transposing to an English Opening or 2.e4 tranposing to a Sicilian Defence.
* 1...f5, the Dutch Variation. 2. Nf3.

10.09.2010 – The best Danish chess player of all time, Bent Larsen, died yesterday, Thursday September 9th, 2010, after a short illness. He had suffered for a number of years from diabetes, but it is not yet known whether this was the cause of his death. In the latter part of his life Larsen resided in Buenos Aires with his Argentinian wife Marta. He will always be remembered.

Мне довелось играть с Ларсеном в Копенгагене в 1979 году. Я получил многообещающую позицию, но долго думал, в цейтноте напутал и проиграл. Полученный урок я запомнил на всю жизнь. «Ты в такой позиции влез в цейтнот и поэтому должен быть наказан!» – прокомментировал мою игру Ларсен. Когда же я выиграл у финского гроссмейстера Вестеринена и обеспечил Бенту первое место, он сказал: «Я был уверен, что ты мне поможешь». Ларсен знал русский язык, как и Фишер, но выучил его не ради шахмат: службу в армии он проводил в разведотделе НАТО.

Интересный факт: и Ларсен, и Корчной (а заодно и Фишер) не получили приглашения на крупнейший международный турнир в Москве, состоявшийся в мае-июне 1967 года. Турнир тот был посвящен 50-й годовщине большевистского переворота и собрал почти всех сильнейших шахматистов того времени. Естественно, что на подобном турнире должен был победить представитель социалистического лагеря, но Фишер с Ларсеном гарантировать этого никак не могли. Вот их и не пригласили, хотя оба в это время года были свободны, как ветер, и выразили желание сыграть в турнире. А нечего обижать Тиграна Петросяна, a заодно и Рону Яковлевну!