How to achieve checkmate with King, Knight & Bishop vs King | Delétang's Net | Fundamental Checkmate

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The ultimate goal in chess is to checkmate the opponent’s king. In case the opponent has only the lone king left on the board, there are four fundamental checkmates that can be applied to force a checkmate with a minimal amount of material.

The four possible mating cases involve:

#1 - King & Queen vs King
#2 - King & Rook vs King
#3 - King & 2 Bishops vs King
#4 - King, Bishop & Knight vs King

In this video, IM Alex Astaneh, is going to show you the fourth fundamental checkmate which involves the king, knight and bishop against the lone king.

If you didn't watched the first three fundamental checkmates, here are the links:

King & Queen vs King: www.youtube.com/watch?v=B4R3gF6pylc
King & Rook vs King: www.youtube.com/watch?v=QNYyv4CZYpY
King & 2 Bishops vs King: www.youtube.com/watch?v=FNx7zRoYnGA

There are two main options to achieve a checkmate with a king, knight and bishop against the lone king. The general idea is to force the opponent's king to the corner of the board that has the same color as the bishop is controlling. For closed positions, where the opponent's king is captured in a net and can therefore not escape to a board corner that has an opposite color than the bishop, the so-called Delétang's method can be applied to achieve checkmate. For open positions, where the king is not captured in a net, the W-Maneuver must be applied to achieve a checkmate.

In this video, we will cover closed positions with the corresponding Delétang's method.

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