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David Navara vs Krishnan Sasikiran
Ordix Open (2007) (rapid), Mainz GER, rd 11, Aug-19
Queen's Gambit Accepted: Classical Defense. Rubinstein Variation (D27)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
Aug-21-07  computer chess guy: 13. Qh4 misplaces the Queen. 15. Ne5 is a terrible blunder (Qg4 and I think White is ok).
Aug-25-07  notyetagm: <computer chess guy: 13. Qh4 misplaces the Queen. 15. Ne5 is a terrible blunder (Qg4 and I think White is ok).>

Wow, that 15 ♘f3-e5?? looks just like a blunder that I made recently at chess club.

The tactical problem for White is that the Black d8-queen is lined up with the <UNDEFENDED> White d1-rook. Yes, it seems rather farfetched but this example shows you the amazing long-range powers of the line pieces (♗♖♕).

Although there are three(!) pieces or pawns currently <BLOCKING> the corridor d8-d1 (White d4-pawn, Black d5-knight and Black d6-bishop), the two Black pieces can move off of the d-file with a <GAIN OF TIME> via the tactical sequence 15 ... ♘d5x♘c3 16 b2xc3 ♗d6x♘e5 and the <PIN> on the White d4-pawn by the Black d8-queen against the <UNDEFENDED> White d1-rook means that White cannot recapture on e5 and has dropped a piece.

An amazing blunder for a 2700-level player who is known for his tactical skill.

Like I said, I recently made a similar oversight at chess club, underestimating the <BALEFUL INFLUENCE> of the Black d8-queen against an <UNDEFENDED> White piece on d1. For Navara it was his d1-rook; for me it was my d1-queen! But then again, I am only rated like 1724 USCF, a far cry from Navara who was once 2725 rated.

You must be =unbelievably= careful when dealing with the lines (d-file) of the opponent's line pieces (Black d8-queen). Like Reinfeld/Chernev said, the <BALEFUL INFLUENCE> of the line pieces allows them to make their presence felt even to the far reaches of the board (from d8 to d1!).

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