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The 2013 Tata Steel Chess is taking place from 12-27 January in Wijk Aan Zee in the Netherlands.
This famous annual tournament has three separate single round-robin competitions, the A, B, and C Groups, each featuring 14 players.

The strongest tournament is the A Group and this year features 6 out of the top 10 ranked players; world champion Vishy Anand, world #1 Magnus Carlsen, defending champion Lev Aronian, rising star Fabiano Caruana, world #6 Sergey Karjakin, and US champion Hikaru Nakamura.
Chess.com has live coverage and commentary of a selection of rounds.

White starts by playing 1.e4 (moving his King's pawn two spaces). This is the most popular opening move and it has many strengths — it immediately works on controlling the center, and it frees two pieces (the queen and a bishop). The oldest openings in chess follow 1.e4. Bobby Fischer rated 1.e4 as "best by test". On the downside, 1.e4 places a pawn on an undefended square and weakens d4 and f4; the Hungarian master Gyula Breyer melodramatically declared that "After 1.e4 White's game is in its last throes". If Black mirrors White's move and replies with 1...e5, the result is an open game.
The most popular second move for White is 2.Nf3 attacking Black's king pawn, preparing for a kingside castle, and anticipating the advance of the queen pawn to d4. Black's most common reply is 2...Nc6, which usually leads to the Ruy Lopez (3.Bb5), Scotch Game (3.d4), or Italian Game (3.Bc4). If Black instead maintains symmetry and counterattacks White's center with 2...Nf6 then the Petrov's Defense results. The Philidor Defense (2...d6) is not popular in modern chess because it allows White an easy space advantage while Black's position remains cramped and passive, although solid. Other responses to 2.Nf3 are not seen in master play.
The most popular alternatives to 2.Nf3 are the Vienna Game (2.Nc3), the Bishop's Opening (2.Bc4), and the King's Gambit (2.f4). These openings have some similarities with each other, in particular the Bishop's Opening frequently transposes to variations of the Vienna Game. The King's Gambit was extremely popular in the 19th century. White sacrifices a pawn for quick development and to pull a black pawn out of the center. The Vienna Game also frequently features attacks on the Black center by means of a f2-f4 pawn advance.
In the Center Game (2.d4) White immediately opens the center but if the pawn is to be recovered after 2...exd4, White must contend with a slightly premature queen development after 3.Qxd4. An alternative is to sacrifice one or two pawns, for example in the Danish Gambit.
Many other variations after 1.e4 e5 have been studied; see Open Game for details.
1.e4 e5 Double King's Pawn Opening or Open Game
1.e4 e5 2.Nf3 Nc6 3.Bb5 Ruy Lopez
1.e4 e5 2.Nf3 Nc6 3.d4 Scotch Game
1.e4 e5 2.Nf3 Nc6 3.Bc4 Italian Game
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 Four Knights Game
1.e4 e5 2.Nf3 Nf6 Petrov's Defense
1.e4 e5 2.Nf3 d6 Philidor Defense
1.e4 e5 2.Nc3 Vienna Game
1.e4 e5 2.Bc4 Bishop's Opening
1.e4 e5 2.f4 King's Gambit
1.e4 e5 2.d4 exd4 3.Qxd4 Center Game
1.e4 e5 2.d4 exd4 3.c3 Danish Gambit