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Subject: ECM errata (201 thru 300)

Author: Amir Ban

Date: 15:51:06 01/22/98



Here's some more work for everybody:

No. 206 (Nxc7):

Looks incorrect: Nxc7 Qxc7 Qd5+ Kh8 Bxd6 and now white has a nasty
surpise with Nb6.

Recommend: Throw it out.


No. 208 (Ndxf4):

This just wins a pawn, but so does Nhxf4.

Recommend: Side solution Nhxf4.


No. 215 (Rd7):

This doesn't work: Rd7 Nxd7 Rxd7 and now I suppose Qc8 is expected and
crushed by Rxe7+, but instead black plays Rag8!

Recommend: Throw it out.


No. 227 (Bxg7+):

I find Qd7, and it seems as good as Bxg7+. Qe7 seems a bit inferior, but
that may be an illusion.

Recommend: Side solution Qd7.


No. 228 (Bg1+):

Bg1+ indeed draws, but so does Bxg3+ even easier.

Recommend: Side solution Bxg3+


No. 231 (Rxd6):

The point of the key is not obvious to me. I find Qh4+ which wins
material.

Recommend: Change key to Qh4+. Check this out.


No. 237 (Bf2+):

Junior's recommendation for black here is to resign. Bf2+ seems like a
particularly bad move. Anyone can say what the point is here ?

Recommend: Throw it out.


No. 247 (Bh7+):

This is a difficult one. I have no doubt the key is correct, but I can't
see better than a draw.

Recommend: No change.


No. 271 (Nxc6):

Qd8 is the right move here (score = 1235). White threatens mate in 2 and
picks up a queen and a few other pieces.

Recommend: Change key to Qd8.


No. 274 (Qxf3+):

One of those where the cook is prettier than the original. The idea is
the discovered check d4, but Qxf3+ is sloppy execution. Nd2! is right.

Recommend: Change key to Nd2.


No. 277 (Rh8+):

I find Qg6 for a +1 score. Rh8+ may well win but I don't see how.

Recommend: Investigation necessary.


No. 280 (Nxg7):

Not an easy one. Nxg7 Kxg7 Bh6+ and white wins.

Recommend: No change.


No. 286 (Qh6+):

I find mate in 11.

Recommend: No change.


No. 287 (Qb5+):

Looking at the position, the assignment "white wins" seems impossible. I
only see that Qb5+ draws, and so does Rc8+.

Recommend: Investigation necessary.


No. 291 (Rxb2):

This one may be correct, but I can't find a win.

Recommend: Investigation necessary.


No. 293 (Qh2+):

There are several ways to score +5 or more, like Rxf1+ and Qxh2+, but I
find Qh3 for +7.

Recommend: Add Qh3 and Rxf1 as side solutions.


No. 297 (b4):

I don't solve this one, but I think it's correct. b4 Bxb4 Ne4 and white
gets an advantage which may be only positional. This needs verification.

Recommend: No change.


No. 298 (Re6):

I find Rf6 first, and then settle on h4. I score Re6 lower, but it
forces a KPKP endgame with a pawn up, so may be the simplest win.

Recommend: Add Rf6 and h4 as side solutions.


No. 300 (Kxd5):

I find Bh2 Ke6 f5+ and this looks like a comfortable win. I don't see a
win after Kxd5 and it looks dubious.

Recommend: Since Bh2 is trivial, throw it out.


Amir





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