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Subject: Re: If you like to crush easy mate...

Author: Pete Galati

Date: 22:10:22 02/10/01

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On February 11, 2001 at 00:29:23, Uri Blass wrote:

>On February 10, 2001 at 16:26:39, Pete Galati wrote:
>
>>This is another position that crashes Crafty, so I assume that the Chessbase
>>interfaces probably won't like it either.
>
>The chessbase interface have different rules then crafty.
>
>It does not like positions when
>max(number of white bishops-2,0)+max(number of white knights-2,0)+max(number of
>white rooks-2,0)+max(number of white queens-1,0)+number of white pawns>8
>
>It also does not like cases when it is truth for black and does not like
>positions with more or less than one king for one of the sides
>It does not like positions when the side to move threats check
>or positions when there are pawns in the 1st or 8th rank.
>
>There is no problem with other positions including this position that is
>illegal:
>
>[D]B1Bk4/1B6/B1B5/3B4/4B3/5B2/6B1/4K2B w - - 0 1
>
>It is interesting to know how much time do your program need to see the draw(if
>your program does not accept the position then you may remove one bishop from
>the board).
>
>Can chest prove that there is no mate when the number of moves is not important?
>
>I have no problem to prove it.
>
>Uri

I'm not sure what to think of that position.  Not that the program is likely so
have a way to quickly look at that position and look ahead enough to know that
it's basically a draw.  Crafty was going to have a try at it.  I moved the
pieces around a bit in Winboard editing the board, and I see no posible way to
mate Blk's King.

The thing that makes that position not posible in any posible game is that there
are 10 Wht Bishops, but with 10 Bishops, you would have to have at least one Blk
Bishop, because it might be posible for 8 pawns to promote to Bishop on Wht
squares, but 2 of the 10 Bishops have to be original Bishops, so one has to be
Black.

Pete

White(1): analyze
              clearing hash tables
              time surplus   0.00  time limit 30.00 (3:30)
         nss  depth   time  score   variation (1)
                6->   0.20  32.00   1. Kf2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7
                7     0.24  32.15   1. Kf2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5
                7->   0.87  32.15   1. Kf2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5
                8     0.97  32.30   1. Kf2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8
                8->   2.52  32.30   1. Kf2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8
                9     4.46  32.25   1. Kf2 Kc7 2. Ke3 Kb6 3. Kd4 Ka5 4.
                                    Kc4 Kb6 5. B8d7
                9     9.11  32.45   1. Kd2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8 5. Kf6 <HT>
                9->  11.38  32.45   1. Kd2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8 5. Kf6 <HT>
               10    13.40  32.25   1. Kd2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8 5. Ke6 Kc7
               10->  31.32  32.25   1. Kd2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8 5. Ke6 Kc7
               11    40.09  32.25   1. Kd2 Ke7 2. Ke3 Kd6 3. Kd4 Ke7 4.
                                    Ke5 Kd8 5. Ke6 Kc7 6. B8d7
White(1): exit
White(1): q
execution complete.



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