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Subject: Re: Computers Correct A Grandmaster

Author: Frank E. Oldham

Date: 17:55:23 03/30/04

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On March 30, 2004 at 14:12:01, Art Basham wrote:

>[D]6r1/1b2kp1p/p2bpp2/7q/3P4/2P1BPrP/P5P1/R2RNQ1K b - - 0 1
>
>In 1946, Dr. Max Euwe played ....Rxg2, and went on to win.
>
>Today however, most computers show that Rxh3+ is actually better here!
>
>I just thought this was interesting!
>
>regards,
>Art

crafty19.10f has a hard time making up its mind :-)
it starts with Rxh3+
                9->   0.42  -2.24   1. ... Rxh3+ 2. gxh3 Rg3 3. Qg2 Rxh3+
                                    4. Kg1 Rg3 5. Rd2 Rxg2+ 6. Rxg2 Bxf3
                                    7. Nxf3 Qxf3
then switches to Rxg2
               12->  42.76  -2.50   1. ... Rxg2 2. Qxg2 Rxg2 3. Kxg2 Bd5
                                    4. Rd2 Qg6+ 5. Kf2 Qg3+ 6. Ke2 Qxh3
                                    7. Rc1 Qf5 8. c4 Bc6 (s=4)
then selects Bd5 patiently, with one or the other rook move next ...
               16-> 161:05  -3.42   1. ... Bd5 2. Rd3 Rxg2 3. Qxg2 Rxg2
                                    4. Kxg2 Qg6+ 5. Kf1 Bc4 6. Rd1 Qg3
                                    7. h4 Qh3+ 8. Ke2 Bg3 9. Rd2 Qxh4 <HT>
                ...
               17-> 285:57  -3.53   1. ... Bd5 2. Rd2 Rxh3+ 3. gxh3 Bc4
                                    4. Nd3 Rg3 5. Nf4 Bxf4 6. Bxf4 Rxh3+
                                    7. Qxh3 Qxh3+ 8. Kg1 Qxf3 9. Rf2 Qxc3
                                    10. Rb1 Bd5 11. Rd1 h5
              time=285:57  cpu=397%  mat=1  n=40947158395  fh=91%  nps=2.39M

Frank



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