Editing Chess (section)

====Check and checkmate====
{{Main|Check (chess)|l1=Check|Checkmate}}
{{col-begin|width=auto; float:right; clear:right}}
{{col-break}}
{{Chess diagram small 
|tright
|
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |kd|  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |rl|  |  |  |  |
|  |  |  |  |kl|  |  |
|The black king is in [[Check (chess)|check]] by the rook.
}}
{{col-break}}
{{Chess diagram small  
|tright
|
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |
|  |  |  |  |bd|bd|  |kd
|  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |kl
|White is in [[checkmate]], being unable to escape attack by the bishop on f3.
}}
{{col-end}}

When a king is under immediate attack, it is ''in [[Check (chess)|check]]''. A move in response to a check is legal only if it results in a position in which the king is no longer in check. There are three ways to counter a check:
* Capture the checking piece.
* Interpose a piece between the checking piece and the king (possible only if the attacking piece is a queen, rook, or bishop and there is a square between it and the king).
* Move the king to a square where it is not under attack.

The object of the game is to [[checkmate]] the opponent; this occurs when the opponent's king is in check, and there is no legal way to get it out of check. In casual games, it is common to announce "check" when putting the opponent's king in check, but this is not required by the rules of chess and is usually not done in tournaments.<ref>{{Cite book|last=United States Chess Federation.|title=U.S. Chess Federation's official rules of chess|others=Just, Tim., Burg, Daniel B.|year=2003|isbn=0-8129-3559-4|edition=5th|publisher=Random House Puzzles and Games|location=New York|oclc=52859422}}</ref>