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Subject: ECM errata (301 thru 400)

Author: Amir Ban

Date: 08:53:23 01/27/98



Here's a new bunch. The problems are getting tougher and so are the
dilemmas ...


No. 313 (Nbd6):

I get Ncd6. It's not a transposition but looks like it will do the job
equally well.

Recommend: Side solution Ncd6.


No. 315 (Rd6):

The idea of Rd6 seems to be 1.Rd6 Bxd6 2.Nf6+ Kh8 3.Rh4 h6 4.Rxh6+ gxh6
5.Qh5 but black has the resource 5...Bf4 6.exf4 Qc5+. Junior prefers an
immediate Nf6+ with the idea of Bxf6 Be4 winning an exchange or a pawn.

Recommend: Change key to Nf6+, or discard.


No. 318 (Bd6):

Bd6 has the right idea, but the correct execution is Bxc7! Then if Rb7
Bd6. An immediate Bd6 lets black off cheaply with Qxd5.

Recommend: Change key to Bxc7.


No. 321 (Rd5):

I play here Nd5 instead, but don't see a plus score. Black mustn't take
on d5, but after Rd5 Qc7 I don't see a continuation.

Recommend: Discard.


No. 327 (Rxd7):

I don't find this. I think it works but I'm not sure. The idea seems to
be Rxd7 Nxd7 Qh5.

Recommend: No change (?).


No. 330 (Rxf6):

I find that the routine Re1 (+186) is more effective.

Recommend: Change key to Re1.


No. 336 (Rxd4):

I find Bxe5! as a free gain of a pawn. I don't know what the point of
Rxd4 is.

Recommend: Change key to Bxe5.


No. 338 (Ng3):

Ng3 is simple and correct, but I find Qb6 which in a more subtle way
achieves at least the same (+395).

Recommend: Side solution Qb6.


No. 345 (Nxf6):

I find a different knight sacrifice Nxf7. I can't follow all the
complications after both, but I consistently get better scores with Nxf7
(+189).

Recommend: Side solution Nxf7.


No. 349 (Rxd5):

Maybe someone can find out the purpose of Rxd5: 1.Rxd5 Bxf2+ 2.Kh1 exd5
3.Qxf7+ Kh8 leads white nowhere ?

Recommend: Discard.


No. 354 (Qxf3):

This one's unclear. 1...Qxf3 2.Nxf3 Rxh3+ 3.Kg1 Rxf3 is a nice position
for black but I don't see a decisive line. This may be meant as a
positional sacrifice. It doesn't look inferior to any other possibility,
which may be a basis for accepting it.

Recommend: Investigate.


No. 366 (Rxd8):

I think this one's wrong. 1.Rxd8 Qxd8 2.Qh4 Kg8 3.Rxf6 white gets two
minor pieces for a rook, but will be sorry he did after 3...Qb6 which
gives black a strong counterattack.

Recommend: Discard.


No. 367 (Rd5):

I have no clue here. A black rook is en prise and Junior just takes it
Bxf8 for a score of 266. Anything wrong with that ? Instead Rd5 places a
white rook en prise for no obvious purpose.

Recommend: Discard.


No. 371 (Rxd5):

I think this is based on faulty defense: 1.Rxd5 cxd5 2.c6 Bc8 3.Ba6 Ka8
and black is not in trouble.

Recommend: Discard.


No. 373 (Rh4):

The assignment is to draw and my solution is prettier: Qg7!

Recommend: Side solution Qg7.


No. 377 (d6):

Don't find what d6 does except lose a pawn.

Recommend: Discard.


No. 381 (e5):

I choose fxe6 (Bxe6 Nd4 or fxe6 e5) which evaluates about the same as
e5. Both options are not decisive in my opinion.

Recommend: Discard.


No. 390 (Qe5):

1...Qe5 2.Qa3 Qe1 but then 3.Qa8+ draws by perpetual, and if black is
not careful he loses.

Recommend: Discard.


No. 395 (Rxe5):

The key is full of good intentions but the right move is Bc4, which gets
a record score of 1616.

Recommend: Change key to 1616.


No. 396 (Re6):

I would call this one (if it's correct) positional, because I can see
the logic of the move but can't find a decisive line. It's not obvious
that white has no other possibilities, or that black is hopelessly lost.

Recommend: Investigate.


No. 397 (Rhg8):

The key is spectacular, but pointless I think, since white can play a
calm Rf2 leaving black with nothing.

Recommend: Discard.


Amir




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