How to checkmate ?
Do you mean stalemate? You have to avoid putting the king in a situation where he is not in check but has no legal moves. https://www.chess.com/learn-how-to-play-chess#how-to-win-chess
Do you mean stalemate? You have to avoid putting the king in a situation where he is not in check but has no legal moves. https://www.chess.com/learn-how-to-play-chess#how-to-win-chess