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Subject: Re: BS 2830 Problem #5 is wrong.

Author: Joachim Rang

Date: 00:59:16 03/17/04

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On March 16, 2004 at 18:58:46, Dann Corbit wrote:

>See this thread:
>http://www.talkchess.com/forums/1/message.html?354948

wait, wait...

The continuation Rxf6 Qxf6 Re1 Qf5 Qxf5 gxf5 Bxd5 leads to a better endgame for
white. If a GM tells me, that this endgame is won for white I believe him right
away.

If engines prefer Qh3 instead because they believe in the attacking chances of
white, it is not convincing for me. King Safety is known to be a heuristic and
even speculative evaluation feature, so a big value for Qh3 proves nothing.
Where are the continuations which lead to a forced win for white after Qh3?

Although Shredder 8 agrees with most programs and prefers Qh3 I don't think this
is a prove that this move is better. If one looks at the PV there is no forced
win in sight.

The additional analysis which shows better defense of black after Rxe6 shows
only, that Rxe6 is not a crushing attack but converts whites advantage in a won
endgame.

regards Joachim

P.S.: Two concrete questions:
1.) Is this position not won for white?

[D] 2r1r3/p3bk1p/1pn2p1B/3n1p2/3P4/PB3N2/1P3PPP/4R1K1 w - - 0 4

2.) How can white win after Qh3?



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