Prophylaxis in Chess

Prophylaxis aims to prevent the improvement of the opponent.
It prevents also the attack oppportunity of the opponent.
prophylaxis in diagram
Diagram 1

Black prevents the move of the White Knight , Nb5 , by playing a6. Thanks to the pawn White cannot use b5-square as an outpost in the attack. Another example of Prophylaxis : Bishop pinned the c3-Knight. and prevented the Knight move.

deflection example 2
Diagram 2

After Re8 , Rook attacks the King and checks . You can block this check by moving the Bishop to e8.
1. Re8 Be8

This is called as block-check.

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