Can the king only move in check?

Under the standard rules of chess, a player may not make any move that places or leaves their king in check. A player may move the king, capture the threatening piece, or block the check with another piece. A king cannot itself directly check the opposing king, since this would place the first king in check as well.

Can a king kill in check?

The king can kill a checkmate threat as long as he doesn't move into threat (as long as there isn't any piece defending the piece the king attacks). Given your confusion over the language for captures, though, the answer is yes: the king can capture an attacking piece if it is undefended.

How many moves can a king make before stalemate?

fifty movesDraw rules The rules allow for several types of draws: stalemate, threefold repetition of a position (with the same player to move), if there has been no capture or a pawn being moved in the last fifty moves, if checkmate is impossible, or if the players agree to a draw.

How does the king move in chess?

The king moves exactly one square horizontally, vertically, or diagonally. A special move with the king known as castling is allowed only once per player, per game (see below). A rook moves any number of vacant squares horizontally or vertically. It also is moved when castling.