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Subject: Re: Ooops

Author: Robert Hyatt

Date: 15:06:39 06/14/03

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On June 13, 2003 at 14:41:04, Jeroen Noomen wrote:

>On June 13, 2003 at 12:03:58, Michael Vox wrote:
>
>GM Shipov's conclusion is 'that the programmers still have a lot
>of work to do'. Actually the chance of getting such a position
>in a real game is around 0,00 - even some of the positions cannot
>be reached in a real game and are illegal- so I fail to see the
>need to work on such positions...
>
>Best regards, Jeroen


However, KBPP vs K with two rook pawns on the same side is _not_ that
uncommon.  And if you can't get _that_ right you get swindled many times.

I've always gotten this position right, excepting for times when I introduced
bugs.  You could look at the game where we beat a master in 1981.  He tried to
swindle Cray Blitz by offering a piece to get both our pawns on the rook
file.  We chose (via knowledge in the evaluation) to eschew the capture (and
the resulting draw).

But in any case, in this position, crafty says this:

                5     0.10   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7
                5->   0.12   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7
                6     0.12   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8
                6->   0.14   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8
                7     0.21   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8
                7->   0.26   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8
                8     0.27   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7
                8->   0.35   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7
                9     0.36   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7 5. Ke8
                9->   0.62   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7 5. Ke8
               10     0.63   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7 5. Ke8 Kh8
               10->   0.87   0.00   1. Bh7 Kxh7 2. Kf6 Kg8 3. Ke7 Kh8 4.
                                    Kf8 Kh7 5. Ke8 Kh8


It correctly understands that a bishop + wrong rook pawn can't win no
matter how many rook pawns there are...




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