Article 5: The completion of the game

5.1	a.	The game is won by the player who has checkmated his opponent’s king. This immediately ends the game, provided that the move producing the checkmate position was a legal move.
	b.	The game is won by the player whose opponent declares he resigns. This immediately ends the game.
5.2	a.	The game is drawn when the player to move has no legal move and his king is not in check. The game is said to end in ‘stalemate’. This immediately ends the game, provided that the move producing the stalemate position was legal.
	b.	The game is drawn when a position has arisen in which neither player can checkmate the opponent’s king with any series of legal moves. The game is said to end in a ‘dead position’. This immediately ends the game, provided that the move producing the position was legal. (See Article 9.6)
	c.	The game is drawn upon agreement between the two players during the game. This immediately ends the game. (See Article 9.1)
	d.	The game may be drawn if any identical position is about to appear or has appeared on the chessboard at least three times. (See Article 9.2)
	e.	The game may be drawn if each player has made at least the last 50 consecutive moves without the movement of any pawn and without any capture. (See Article 9.3)

Note: This is an excerpt from the FIDE Handbook. For actual handbook click here