The loss also meant a heavy slide of 15 rating points for the Indian as he slipped to ninth spot in the World Chess rankings.
Lionel Messi came off the bench to preserve Barcelona's unbeaten run in La Liga with a sensational late equaliser in a thrilling 2-2 draw at Sevilla on Saturday as the runaway leaders came back from two goals down in the space of a minute.
Five-times European champions Barca, with their trident of Lionel Messi, Luis Suarez and Neymar subdued, have not exited in the last 16 since going out to Liverpool in the 2006/07 season and the score equalled their worst Champions league loss.
News of all that's transpired on and off the football field
With five titles, Barca are now level with AC Milan on all-time UEFA Super Cup winners list
Barcelona coach Luis Enrique is head strong but it appears as though he may be fighting a losing battle with the four times World Player of the Year.
News of all that's transpired on and off the football field
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Atletico Madrid's La Liga title challenge took a nosedive when they slumped to a shock 3-0 defeat at Osasuna on Sunday, leaving Real Madrid three points clear at the top.
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Paris St Germain made light of the absent Zlatan Ibrahimovic and a sub-standard start to the season to claim a 3-2 Champions League victory over Barcelona on Tuesday.
Real Madrid's hopes of overhauling La Liga leaders Barcelona suffered a stinging blow when they were held to a 2-2 draw at home to Valencia.
An under-strength Barcelona got their Champions League campaign off to a solid if unspectacular start when Gerard Pique's header secured a laboured 1-0 win at home to APOEL in their Group F opener on Wednesday.
One of the most disappointing aspects of Barcelona's failure to win major silverware last season was the lack of on-field chemistry between Lionel Messi and Neymar.
Atletico Madrid were handed a chance to avenge last season's Champions League final defeat by city rivals and record 10-times winners Real after the two sides were drawn together in the last eight on Friday. Paris St Germain and Barcelona were paired together having met in the group stage, with the French side winning in Paris and the Catalans coming out on top in Spain.
There was the usual frenzy of last-minute deals as the English Premier League brought the curtain down on another bumper European transfer window in which Manchester City again flexed their financial muscle as the continent's top spenders.
Barca dominated possession and Luis Suarez had several early chances but it was Villarreal who took the lead with Denis Cheryshev redirecting a Mario Gaspar shot past keeper Claudio Bravo on the half hour.
An insatiable Lionel Messi scored for the eighth game in a row in all competitions as La Liga champions Barcelona saw off a gutsy Girona side 2-0 to go five points clear at the top of the standings.
'I feel as confident and motivated as at the beginning. I can't control rumours, but I still have faith'
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Cristiano Ronaldo ensured Atletico Madrid fans will have bitter memories of the last local derby at the Vicente Calderon stadium by scoring a hat-trick in a 3-0 win for La Liga leaders Real Madrid on Saturday. Ronaldo's deflected free kick put Real in charge in the 23rd minute in the first meeting of the teams since the Champions League final in May. The prolific Portuguese killed off Atletico's resistance by winning and converting a penalty in the 71st minute and capped a harrowing night for the home side by tapping in the third in the 77th.
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field
Marc Marquez retained his MotoGP title with a fighting second place finish in the Japanese Grand Prix on Sunday, the dominant Spaniard securing a fourth global title in five years at his Honda team's home Motegi circuit.
Barcelona suffered a first home defeat of the season when they lost 3-2 against Valencia after finishing with 10 men in La Liga on Saturday, leaving the door open for Madrid rivals Atletico and Real to move above them.
Viswanathan Anand put behind the disappointment of the World Championship loss and started his campaign by first beating England's Luke McShane and later drawing with Michael Adams, another Englishman, in the preliminaries of the London Classic.
Ten of the 16 sides also reached the same round two seasons ago and, as usual, the big five leagues dominate with 13 clubs hailing from either the English, Spanish, German, French and Italian leagues.
Barcelona's Luis Suarez netted twice for a 2-1 win over 10-man Atletico Madrid in their Champions League quarter-final, first leg on Tuesday after the visitors' Fernando Torres opened the scoring and was later sent off.
Real Madrid's star striker Cristiano Ronaldo made up for his otherwise quiet night by scoring the winner to beat Barcelona 2-1 win at the CampNou in Barcelona on Saturday.
News of all that's transpired on and off the football field
Having returned to England after his humiliating ouster from Chelsea, it is up to Jose Mourinho to leave a positive legacy at Manchester United.
Barcelona are still trying to lure Paris St Germain centre back Thiago Silva to the Nou Camp but will look elsewhere if they fail to snare the Brazil international, coach Tito Vilanova said on Tuesday.
Clashes between Real Madrid and Barcelona are rarely short on drama and Saturday's La Liga 'Clasico' may have more than its usual share with Luis Suarez poised to return from a biting ban and Barca teammate Lionel Messi on the brink of equalling the top-flight scoring record.
Barcelona coach Luis Enrique has given his backing to Xavi and says the veteran midfielder remains a valuable member of the squad despite having played just 45 minutes in the opening five La Liga games.
Dil Dhadakne Do unravels like an entire season of soap opera condensed into a nearly three-hour movie, writes Sukanya Verma.
A summary of Tuesday night's matches in the UEFA champions League.
La Liga leaders Real Madrid were thumped 4-0 away by city rivals Atletico Madrid to open up the Spanish title race, while Chelsea strengthened their hold on top spot in the English Premier League after a 2-1 win at Aston Villa.
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In an exciting weekend for football lovers, Cristiano Ronaldo and Lionel Messi continued their extraordinary double act, both scoring hat-tricks as Real Madrid and Barcelona maintained their battle for supremacy at the top of La Liga. Chelsea's unbeaten start to the Premier League season ended with a dramatic 2-1 defeat at Newcastle United on Saturday but no-one can get the better of Bayern Munich, who marched on in the Bundesliga with a 1-0 win over Bayer Leverkusen. We present a summary of events in photos.
Lionel Messi may lack a World Cup for Argentina but his 10 years with Barcelona have seen him rewrite the history books and become symbolic with the club's golden era.
A round-up of the World Cup qualifying matches played on Friday.
News of all that's transpired on and off the football field
