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Subject: Re: pawn endgame position

Author: Robert Hyatt

Date: 07:12:24 01/23/01

Go up one level in this thread


On January 23, 2001 at 03:06:53, Dusan Dobes wrote:

>On January 22, 2001 at 15:57:52, Dann Corbit wrote:
>
>>>I am interested if "your" engine could resist to play 46.Qe6+ in a blitz game.
>>>
>>>[D]6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w
>>>
>>>Best wishes,
>>>Steffen.
>>>
>>>[Event "ICS rated blitz match"]
>>
>>Phalanx has a time of it:
>>
>>[ white, 1 ]
>>6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w
>>
>>6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w
>>    -> increment adds 1440 s to soft time limit
>>    -> soft time limit 3154.28 s
>>    -> hard time limit 41599.9 s
>>  6    654   112   213089  Qf6-e6  Qd7-f7  Pf5-f6  Pa5-a4  Qe6-c8  Kg8-h7
>>                           Pe5-e6  Qf7xf6  Qc8xc7  Kh7-g6
>>  6 ->   0:01.60   305919   0 turns
>>  7    654   583  1226489  Qf6-e6  ??
>>  7    352   742  1585651  Qf6-e6  Qd7xe6  Pf5xe6  Pa5-a4  Pd5-d6  Pc7xd6
>>                           Pe5xd6  Kg8-f8  Pd6-d7  Kf8-e7  Pd7-d8B  Ke7xd8
>>                           Ph2-h4  Kd8-e7
>>  7    357   762  1623830  Qf6-g6  !
>>  7    525   919  1926808  Qf6-g6  Kg8-f8  Qg6-h6  Kf8-g8  Qh6-g5  Kg8-f8
>>                           Kh1-g1  Qd7xd5
>>  7 ->   0:10.26  2108193   1 turn
>>  8    525  1161  2360687  Qf6-g6  Kg8-f8  Qg6-h6  Kf8-g8  Qh6-g5
>>  8 ->   0:23.94  4694659   0 turns
>>  9    525  2935  5710337  Qf6-g6  Kg8-f8  Qg6-h6  Kf8-g8  Qh6-g5
>>  9    526  3916  7666834  Qf6-g5  Kg8-f8  Pd5-d6  Pc7xd6
>>  9 ->   1:10.73 13328419   1 turn
>> 10    526  8747 16329005  Qf6-g5  Kg8-f8  Pd5-d6  Pc7xd6  Pe5-e6  Qd7-b7
>>                           Kh1-g1  Qb7-g7  Qg5xg7  Kf8xg7  Pe6-e7  Kg7-f7
>> 10 ->   3:58.68 42938008   0 turns
>> 11    526 40425 71196909  Qf6-g5  Kg8-f8  Pd5-d6  Pc7xd6  Qg5-h6  Kf8-g8
>>                           Pe5-e6  Qd7-b7  Kh1-g1  Qb7-g7
>> 11 ->  17:32.80 184157117   0 turns
>
>So that's 7.62 seconds to switch to a different move.
>Phalanx has special knowledge that helps it to see
>those things quickly. It has huge extensions (like several
>full plies) on piece exchanges leading to pawn-only endgames.
>
>Dusan


I think you are overlooking the PV.  IE it is _still_ showing a queen exchange,
just not instantly.  IE at depth=10.  Trading on g7.  Doesn't matter where
you trade, white loses this if the b-pawn stays on the board.



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