Queen checkmate is the most obvious out of all the possible checkmate positions. As a result, most chess players resign when their opponent has a queen and they are soon to be checkmated.
On the diagram, the white king is driven into the corner of the chessboard, which is a common theme when checkmating the opponent. The white king is at the corner a1. While the black king stays at b3, where it guards the squares a2 and b2, and prevent the white king from moving to this square. The black queen comes to c1 to check the white king, and the white king has no other place to go (since all other squares are guarded by black pieces, including where the white king stands). Therefore, white king is checkmated and the player who plays white is lost.
To checkmate your opponent's king with a rook, it is necessary to drive the king to the edge of the board, as shown on the diagram. The black king is stranded on f1. The white king stands on f3, in a manner called "opposition" in which it guards the squares e2, f2, and g2, preventing the black king from escaping to those squares. Then the white rook checks the black king on h1, and the black king has no square to escape to. Therefore, black is checkmated and the player who played white wins. Stalemating with a rook rarely occurs but it happens! It is usually wiser to use the "opposition" to drive the opponent's king to the edge of the board, with the help of a rook. Then, use the rook to checkmate the opponent in the last move.
One bishop along cannot checkmate the opponent's king. However, two bishops can achieve this. On the diagram, the black king on h7 is driven to the corner. It is not too difficult for two bishops to force checkmate, with the aid of their king. Two principles apply:
1. The bishops are best when they are near the center of the board and on adjacent diagonals. This cuts off the opposing king.
2. The king must be used aggressively, in conjunction with the bishops.
The diagram shown illusrates a key theme in checkmating, which is the oppositon of the kings. The white king stands on f7 and guarding the squares g8 and g6 and supporting the bishop on g7, which guards squares h8 and h6. If there were only this white bishop and the king, the position would be a stalemate. However, the presence of white's other bishop decides the game. It stands on f5 and checkmates the black king.
It is impossible to force checkmate with a king and two knights, although checkmate positions are possible. Checkmates with two knights usually not possible because it is very hard to force the opponent's king into one corner. Since knights are short-range pieces, it would be very difficult to limit the opponent's king while prevent itself from getting attacked. On the diagram at the right, the black king is on h8, white king on h6, and white knights are on f6 and g6. There are only four possible ways to checkmate using two knights. This position depicts one of them. The other three are at other three corners of the chessboard with similar set up to this one.