Author: Uri Blass
Date: 16:42:25 09/05/04
Go up one level in this thread
On September 05, 2004 at 19:32:50, Günther Simon wrote:
>On September 05, 2004 at 19:27:49, Uri Blass wrote:
>
>>On September 05, 2004 at 19:17:24, Günther Simon wrote:
>>
>>>On September 05, 2004 at 19:04:48, Uri Blass wrote:
>>>
>>>>On September 05, 2004 at 18:55:53, Günther Simon wrote:
>>>>
>>>>>On September 04, 2004 at 11:46:48, Ed Schröder wrote:
>>>>>
>>>>>>Does someone possess a good test set for testing Perpetual Checks ?
>>>>>>
>>>>>>Thanks.
>>>>>>
>>>>>>Ed
>>>>>
>>>>>
>>>>>Well may be this one is too difficult for all current programs ;)
>>>>>For the record, this game really happened just one hour ago
>>>>>in a RWBC test tourney with live broadcast.
>>>>>Humans immediately see the draw I guess...
>>>>>The prog with Black resigned a few moves after it saced the first rook
>>>>>and started to check. May be with resign off it would have played
>>>>>alright until 50 moves rule? (Resign was -8)
>>>>>
>>>>>[D] 7k/R5R1/8/3r3P/3r3K/5P2/6P1/8 w - - 0 59
>>>>
>>>>No draw
>>>>Movei finds the line
>>>>
>>>>g4 Rxg4+ Rxg4 Rxh5+ Kg3 Rh3+ Kf4 Rxf3+ Ke4 Re3+ Kd4 Rd3+ Kc4 Rc3+ Kb5 Rc5+ Ka4
>>>>
>>>>Uri
>>>
>>>Movei is wrong.
>>>
>>>Günther
>>
>>No
>>
>>g4 Rxg4+ is the only check
>>
>>Rxh5+ Kxh5 Rd5+(only check) Rg5 Rxg5+ Kxg5 no stalemate
>>
>>later it is easy for me to see that black moves are the only checks and in the
>>end after Ka4 white can take with the rook to avoid stalemate.
>>
>>Uri
>
>You are right I missed you had Rxg4 instead of Kxg4 your PV, sorry.
>
>Then we have to cancel the double sac and return to a position
>which really happened later:
>
>
>[D] 7k/R5R1/8/3r3P/6K1/5P2/8/8 b - - 0 60
Movei is very fast in finding a small negative score for black.
It is not sure that it is perpetual so it gives white the advantage but the
advantage is very small.
Here is movei's analysis:
[Event "Edited position"]
[Site "URI-PC"]
[Date "2004.09.06"]
[Round "-"]
[White "-"]
[Black "-"]
[Result "*"]
[FEN "7k/R5R1/8/3r3P/3r3K/5P2/6P1/8 w - - 0 1"]
[SetUp "1"]
{--------------
. . . . . . . k
R . . . . . R .
. . . . . . . .
. . . r . . . P
. . . r . . . K
. . . . . P . .
. . . . . . P .
. . . . . . . .
white to play
--------------}
1. g4 Rxg4+ 2. Kxg4 Rg5+ 3. Kf4 Rf5+ 4. Ke4 Re5+ 5. Kd4 Rd5+ 6. Ke3 Re5+ 7.
Kf2 Re2+ 8. Kg3 Rg2+ 9. Kf4 Rg4+ 10. Ke5 Re4+ 11. Kf6 Re6+ 12. Kf7 Rf6+ 13.
Ke8 Rf8+ 14. Ke7 Re8+ 15. Kf7 Rf8+ 16. Kg6 Rf6+ 17. Kg5
*
Uri
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