Checkmate Using a Knight and a Bishop
It's easy to checkmate the enemy king with several powerful major pieces. Thus, towards the end of the game many players try hard to preserve their major pieces in preparation for a checkmate. The problem lies when what we're left with are mere minor pieces—a knight and a bishop. How would our checkmate strategy be?
When we have forced the king to a corner our king should be a mere space away from it on an edge square, the knight beside our king and checking the enemy king, while our bishop diagonally at the side of our bishop near the enemy king. They're all inside the 9 squares of a corner of the chess board. If we get them to this position within 12 moves then a checkmate is possible. How is this possible?
When we're left with a king, knight, and a bishop we have to checkmate the enemy king as soon as possible. Remember that once the opponent is left with just a king the 12-move limit starts being enforced. We must checkmate the king within the given limit. If we were left with a queen, or rooks, or even minor pieces with rooks or the queen, checkmating would be easy. But a knight and a bishop?
We have to force the enemy king to a corner. We can use the bishop to establish a delimiting boundary diagonally to force the king to retreat. A delimiting boundary is a horizontal, vertical, or diagonal line on or beyond which the enemy king cannot go and force it to retreat. The line is gradually advanced towards the king to keep it retreating further until it is pinned to a corner. This is vital for a checkmate strategy to be successful, especially when we have only minor pieces to accomplish it.
In this case, the bishop establishes the delimiting boundary line diagonally. The knight helps in the delimitation and in forcing the enemy king to retreat, and the king moves along aiming to be as close to the enemy king as possible. Gradually, with this strategy, we put the enemy king to a corner.
A delimiting boundary line is only effective when the game is at near-end and the enemy has nothing except the king and perhaps some pawns. With other pieces usable for blocking, boundary lines are useless to establish a delimiting line.
Thus, we have to be as aggressive and witty as possible when left with a mere king, bishop, and knight for a checkmate strategy.
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