Author: Dann Corbit
Date: 10:19:47 06/26/01
Go up one level in this thread
On June 26, 2001 at 13:08:22, Sune Larsson wrote:
>On June 26, 2001 at 12:52:52, martin fierz wrote:
>
>>On June 26, 2001 at 12:18:53, Dann Corbit wrote:
>>
>>>On June 26, 2001 at 12:09:25, martin fierz wrote:
>>>
>>>>hi dann,
>>>>
>>>>>you know, the one where I claimed there was a blunder? Turns out that there is
>>>>>a perpetual check if you take the rook from this position. The only problem is,
>>>>>I can't find it! Help me find what is obvious to a good player but is way over
>>>>>my head.
>>>>>
>>>>>[D]4k2r/rp5p/pR4p1/R3qp2/3pp1PQ/8/2P4P/6K1 b k -
>>>>>Qxa5 {forced, I think}
>>>>>Rxg6 {forced, I think}
>>>>
>>>>not very forced, i think :-)
>>>>Qf6 looks like the perpetual which is obvious to strong players, but not to
>>>>computers. you can go and take the pawns on c2 and g4 with check still, but
>>>>that will still make it a perpetual, i think... (no computer here...)
>>>
>>>I'm afraid you really don't see how dense I can be. Someone is going to have to
>>>spell it out for me. I mean *literally* do this and do that and to this and do
>>>that and see: the perpetual check!
>>>
>>>Here is what I see:
>>>[D]4k2r/rp5p/pR3Qp1/q4p2/3pp1P1/8/2P4P/6K1 b k -
>>>
>>>In the worst case, Qxb6 Qxb6 and it's two rooks and a big pawn advantage verses
>>>a queen.
>>ok, lets see your qxb6 line,
>>
>>1... qxa5 2.qf6 qxb6 3. qxb6 ra8 (this one really looks forced) then i go 4.
>>qe6+. moving to the right will take you nowhere:
>>4....kf8 5. qf6+ kg8 6. qe6+ kg7 7. qe7+ kh6 8. qh4+ and we're back where we
>>started, so you must go 4... kd8 5. qd6+ kc8 and now black lacks all
>>coordination. so white has time for 6. gxf5 and fritz gives lots of 0.00
>>evaluations here - perpetuals everywhere. the point of gf5 is to open up the
>>position a bit for the perpetual - i wanted to go 6. qe6+ first but black can
>>run with his king to g5 and white has no check anymore. now anyway 6. ..gf5 will
>>take you to an immediate draw with qc5+ and checks along the 5th row with the
>>queen as you can play qxf5+ now which you couldnt before.
>>
>>so the qxb6 is obviously not good enough for more than a draw.
>>
>>a better try is
>>
>>
>>
>>1...Qxa5 2.Qf6 Qe1+ 3.Kg2 Qe2+ 4.Kg1 Qxg4+ 5.Kh1 Qd1+ 6.Kg2 Qxc2+ 7.Kg1 and
>>now you can go looking for some way to escape the draw. i admit that this is
>>looking good for black after 7...Kd7 :-(
>
>
> And then 8.Qxd4+ Kc7 9.Qd6+ Kc8 10.Qe6+ Kb8 11.Qe5+ Qc7 12.Qxh8+ Qc8
> 13.Qe5+ Ka8 14.Re6 and black must take out the perpetuals.
I can see that the queen for rook does no good.
I see a lot of checks with Qe1+ but I am going to try that anyway. If at some
time, I can toss a rook for a queen or somehow maintain and advantage or wiggle
out of check, then it might work.
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