Author: Sune Larsson
Date: 14:45:34 02/27/01
Go up one level in this thread
On February 27, 2001 at 17:23:47, Heiner Marxen wrote:
>On February 27, 2001 at 08:20:47, Sune Larsson wrote:
>
>>On February 27, 2001 at 04:32:01, Paul wrote:
>>
>>>On February 26, 2001 at 21:34:07, Sune Larsson wrote:
>>>
>>>>
>>>> [D]8/7b/8/8/1N5p/1pp5/7Q/k1K5 w - - 0 1
>>>>
>>>>
>>>> It was late one night in the smoky, old club house. Master Paradox was
>>>> blitzing as white against the stubborn Mr.Doubt. In highest time pressure
>>>> Master Paradox played 1.Qa2+ and hissed out: "Mate". "Hah, this is no mate.
>>>> I just take it!", Mr Doubt yelled and played his 1.-bxa2. "I said mate",
>>>> replied Master Paradox with rugged voice - lifted his knight and placed it
>>>> with a thud on c6 (2.Nc6). Mr Doubt stared at the position. Naturally he
>>>> couldn't believe his own eyes...shuffled up the pieces and left the room
>>>> without a word.
>>>>
>>>> True? Not really ;) This position is from Keres. White, a queen up, faces
>>>> the unpleasant ...b2+. The only way to bring it home is the paradoxical
>>>> 1.Qa2+! After 1.-bxa2 2.Nc6! black is helpless against the threat 3.Nd4
>>>> with mate on b3(c2). A true beauty!
>>>>
>>>> Test: This position should be solvable since there is a forced mate.
>>>>
>>>> Sune
>>>
>>>Hi Sune!
>>>
>>>First ... thanks for the positions you've been giving us the last couple of
>>>days! They sure are educational and easy to understand ... for me at least.
>>>
>>>This is really helpful, since I'm not a strong chess player so am having some
>>>difficulties finding the right knowledge to build into my chess program. I like
>>>to fiddle with the search, and neglect the eval part :) ... so this is giving
>>>me some ideas! Although it's not clear to me whether I should use this, coz I'm
>>>not sure (in light of the results) if even the top programs have this knowledge
>>>built in! ;)
>>>
>>>The above position is a different kind of 'animal' though, it's an easy (at
>>>least for my program, less than a second :)) forced mate. I knew this one, and
>>>remembered that I have (dare I say) an even more entertaining position two moves
>>>prior to this one:
>>>
>>>[D]8/7b/8/8/7p/1pp5/7Q/k1K1N3 w - - 0 1
>>>
>>>This is also a forced mate, but a bit deeper than the other one ... enjoy! :)
>>>
>>>Groetjes,
>>>Paul
>>
>> Thank you very much Paul! Very nice indeed! After 1.Nc2+ the two different
>> takings of the knight were refuted. Then 1.-Ka2 2.Nb4++ Ka2 leads to the
>> first game in the club house ;) Third and last the alternative 2.-Ka3 claimed
>> a few more moves. Beautiful!
>>
>> Sune
>
>Hmm, could someone please give a PV after 1.Nc2+ Ka2 2.Nb4+ Ka3 ?
>What is the intended winning line?
>Chest does not see any mate in 12 to follow.
>
>Heiner
I stopped looking after 3.Nd3 Bxd3 4.Qd6+ Ka4 5.Qxd3 or
3.Nd3 b2+ 4.Nxb2
Also after 3.Nd3 the threat is Qd6+ with mate in 2. White is winning.
Sune
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