Naked Pin Ends this game of Chess

 If naked pin is not a tactical motif, then it should be. What happened to American player WildRaven is actually called a deflection sacrifice

In the above diagrammed position, Black just played Rd5 protecting his b5 pawn and "keeping an eye" on White's far advanced d7 pawn. The winning  move is easy to discover if one realizes the simple truth that a Queen is invariably worth more than a Rook. HInt: What is the only move White can make to prevent Queen Pawn from becoming a lovely lethal lady? Alliteration for choice!

Incidentally, I have never understood why WildRaven has a USCF rating below 1600. He is such an uncompromising and principled player at the Internet Chess Club in Pennsylvania!

Also Kenny Lucky can tell your more about Naked Pin as it relates to Mary Wollstonecraft.

Protected Passed Pawn Converted to Winning Diagonal Opposition

 

Lovable NYC chess coach, writer, teacher, mainstay contributor to USCF periodical Chess life Bruce Pandolfini has an extreme fondness for the term Jettison. 

In the above diagrammed position with 3 pawns per side, Blacks protected passed d5 pawn appears stuck unless one is acquainted with the endgame principle of diagonal opposition. So note that if Black plays pawn to d4 the White Monarch is forced to capture the jettisoned peon. After the Black King captures  White's f6 button, the Kings are on same diagonal separated by a single square and White's c5 pawn will eventually fall leading to a winning KP ending for Black.

In this example Bruce's term jettison essentially deflects the White King into a losing KP ending. 

Central Pawn Duos ALWAYS worth something

I recall Peter Kappler a computer scientist residing in Austin, Texas USA, who was also a strong A player in the United States Chess Federation , stating that central pawn duos were evaluated separately by all evaluation functions that were worth their salt.

The following game played at the internet chess club hosted in the United States is an excellent example of why.

Pozarek decided to disconnect and forfeit rather than resign like a gentleman in the following position. He was apparently very afraid  of Black's passed a pawn while not giving any value to the his own passed pawn duo at d5 and e5.

Black would probably try Bb3, clearing the a file for the advance of his a pawn, in the diagrammed position and Pozarek would play the natural Bf5 check pushing the Black King to f7 when the pawn advance d6 would be the strongest move.

Pozarek, quit by disconnection because he did not notice the drawing deflection resource Bg6 ! The Bishop is immune to capture, otherwise the d pawn will queen. Moves like this are also called attraction sacrifices in this case attracting the King away from the square of the pawn!

Pawn Queening Deflection

The following 3 minute blitz game played at the internet chess club is an excellent example of a deflection sacrifice leading to the promotion of a pawn to a Queen. The opening was a Benko where White managed to create a passed d pawn due to a Benoni-like e5 thrust before Black's queenside play manifested.



chichi1950 from Spain, playing with the Black pieces, must have been feeling quite comfortable with  his Rooks doubled at b2 and d2 with the threat of Rook captures pawn at f2 either drawing easily or perhaps winning.

White's trump is his passed d7 pawn which is a single square from Queening. With White to move, see if you can find a deflection move which either leads to the pawn promoting to a Queen or  the loss of a Rook.