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Subject: ECM errata (681 thru 800)

Author: Amir Ban

Date: 07:58:22 02/23/98



The latest installment in this best seller:


No. 681 (Rxh7):

This is a bad one: Rxh7 Qxd1+. Worse, the simple Qh2 wins easily (h5
Be2).

Recommend: Changed key to Qh2.


No. 683 (Rxh2):

I don't know about this. The continuation I analyze is 1... Rxh2 2.Kxh2
Qh8+ 3.Kg1 Nxg4 4.Rf7 Qh2+ 5.Kf1 Qh1+ 6.Ke2 Qxg2+ (not Qxc1 7.Rf1) 7.Kd3
Nf2+ 8.Rxf2 is unclear.

Recommend: Drop it.


No. 684 (Nxh7):

I don't find a continuation for this knight sacrifice.

Recommend: Investigate.


No. 686 (Bxh7+):

Maybe it works but I cannot find better than a draw after 1.Bxh7+ Kxh7
2.Qh5+ Kxg7 3.Rd1

Recommend: Investigate.


No. 687 (Bxh7+):

I think it's bad: 1.Bxh7+ Kxh7 2.Nxf7 Kg6 is better than it seems,
though 3.h4 Qc6 4.h5+ Kh7 5.g6+ Kg8 6.h6 is scary.

Recommend: Drop it.


No. 693 (Bxh7+):

1.Bxh7+ Nxh7 2.g6 Nf8 black seems fine.

Recommend: Investigate.


No. 698 (Bxh2+):

It's probably bad 1...Bxh2+ 2.Kh1! and black is in trouble.

Recommend: Drop it.


No. 699 (Bxh2+):

I think I see a problem here: 1...Bxh2+ 2.Kxh2 Qh4+ 3.Kg1 Bxg2 4.Kxg2
Rc6 5.Bf4! and white holds.

Recommend: Drop it.


No. 702 (Rxg7+):

Rxg7+ is right, but Rxf7 is just as good (Kxf7 Rf5+).

Recommend: Add Rxf7.


No. 706 (Rxg7):

There seems to be something wrong with Rxg7, but fxe6 is clearly
winning: fxe6 Bxe6 Rxf6 game over.

Recommend: Change key to fxe6.


No. 712 (Nxg2):

This is bad: 1...Nxg2 2.Nxb7. A nice refuation on the opposite side of
the board.

Recommend: Drop it.


No. 718 (Rxg7+):

How is this supposed to work ? I see: 1.Rxg7+ Bxg7 2.Rg1 Rc8 3.Bxe4 Kf8
4.Rxg7 b3! how does white improve on this ?

Recommend: Investigate.


No. 719 (Nxg2):

I can't see anything decisive out of the key. Qe6 looks like the best
move (+108). The threat of Qg4 wins a pawn at least.

Recommend: Change key to Qe6.


No. 722 (Rg3):

1.Rg3 Bd7 2.Rxg7+ Kxg7 and what comes next ?

Recommend: Investigate.


No. 725 (Rxg2+):

Black can choose between two winning moves: Bh3 and Qf3, both look
better than the key.

Recommend: Drop it.


No. 730 (Nxf7):

I get Nxd7 (Nxd7 Bd6 +114). Nxf7 doesn't look less convincing.

Recommend: Drop it.


No. 754 (Bxf7+):

I can't find a winning line: 1.Bxf7+ Kxf7 2.Qb3+ Ke8 3.Nd5 Bd6

Recommend: Investigate.


No. 758 (Bxf6):

I am guessing that the intent is 1.Bxf6 gxf6 2.Nxf7 Kxf7 3.Qh7+ but I
don't see that this leads to a win.

Recommend: Investigate.


No. 762 (Nxf7):

I don't know how this is supposed to work. E.g. 1.Nxf7 Kxf7 2.Qe6+ Kf8
3.Bb3 Nd5.

Recommend: Investigate.


No. 764 (Nxf7):

I have a bad position. White has three knights ?

Recommend: Find the right position.


No. 766 (Nxf2):

The best moves looks to be Bxh3 (Bxh3 Qh4).

Recommend: Change key to Bxh3.


No. 767 (Bxf7+):

This is unclear. Bxf7+ is the best move, but how does it win ? (1.Bxf7+
Kxf7 2.Rxf5+ Kg7 3.d7 Nxd7 4.Qxd7+ Kh8).

Recommend: Investigate.


No. 769 (Bxf7):

Be7+ is clearly better (Kg8 Bd6).

Recommend: Change key to Be7+.


No. 799 (Nxg6+):

Rxf5+ is better (exf5 Nd7+).

Recommend: Change key to Rxf5+.


Amir



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