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Subject: Re: Perpetual Position for Ed

Author: Robert Hyatt

Date: 19:16:49 09/08/04

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On September 08, 2004 at 13:56:00, Gerd Isenberg wrote:

>On September 07, 2004 at 17:45:04, Nolan Denson wrote:
>
>>This position came about in a trny on ICC
>>
>>Perpetual
>>
>>[D]3r3k/p4p2/5p1p/7B/P4Q2/1r1q3P/2Rp1PP1/5RK1 b - - 0 1
>
>Thanks for the position, Nolan.
>
>For me it seems not that simple as Bob suggest.
>May be i have a bug in IsiChess somewhere.
>Qf1 was easy, but failing low to draw score took some minutes ;-(


Here is what I get on the 4-way opteron:

               12    11.95  -2.24   1. ... Qxf1+ 2. Kh2 Qa1 3. Bxf7 Qe5
                                    4. Qxe5 fxe5 5. Rxd2 Rxh3+ 6. Kxh3
                                    Rxd2 7. Kg3 Kg7 8. Be6 Kg6
               12->  16.90  -2.24   1. ... Qxf1+ 2. Kh2 Qa1 3. Bxf7 Qe5
                                    4. Qxe5 fxe5 5. Rxd2 Rxh3+ 6. Kxh3
                                    Rxd2 7. Kg3 Kg7 8. Be6 Kg6
               13    39.13     +1   1. ... Qxf1+
               13     1:34  -0.01   1. ... Qxf1+ 2. Kh2 Qa1 3. Qxh6+ Kg8
                                    4. Bxf7+ Kxf7 5. Qh5+ Kg8 6. Qg6+ Kf8
                                    7. Qh6+ Ke7 8. Qg7+ Ke6 9. Qg4+ Ke7
                                    10. Qg7+ <HT>



>Even in this position finding Bxf7 with draw score took one minute.
>
>[D] 3r2k1/p4p2/5p1Q/7B/P7/1r5P/2Rp1PPK/q7 w - - ; bm Bxf7
>
>Gerd

Same program same machine:

                9->   0.94  -3.30   1. Rc4 Qe5+ 2. g3 Qxh5 3. Qxh5 d1=Q
                                    4. Rg4+ Kf8 5. Qh8+ Ke7 6. Re4+ Kd7
                                    7. Qxf6 Qd5 (s=2)
               10     1.57     +1   1. Rc4!!
               10     2.34  -2.50   1. Rc4 Qe5+ 2. g3 Qxh5 3. Qxh5 d1=Q
                                    4. Rg4+ Kf8 5. Qh8+ Ke7 6. Re4+ Kd7
                                    7. Qxf6 Kc8 8. Qxf7
               10     4.54     +1   1. Bxf7+!!
               10     5.15     +3   1. Bxf7+!!
               10     6.64   0.01   1. Bxf7+ Kxf7 2. Qh5+ Kg8 3. Qg6+ Kf8
                                    4. Qh6+ Ke7 5. Qg7+ Ke6 6. Qg4+ Ke7
                                    7. Qg7+ <HT>
               10->   6.79   0.01   1. Bxf7+ Kxf7 2. Qh5+ Kg8 3. Qg6+ Kf8
                                    4. Qh6+ Ke7 5. Qg7+ Ke6 6. Qg4+ Ke7
                                    7. Qg7+ <HT> (s=2)
               11     8.67   0.01   1. Bxf7+ Kxf7 2. Qh5+ Kg8 3. Qg6+ Kf8
                                    4. Qh6+ Ke7 5. Qg7+ <HT>
               11->   9.23   0.01   1. Bxf7+ Kxf7 2. Qh5+ Kg8 3. Qg6+ Kf8
                                    4. Qh6+ Ke7 5. Qg7+ <HT>
               12    15.88   0.01   1. Bxf7+ Kxf7 2. Qh5+ Kg8 3. Qg6+ Kf8
                                    4. Qh6+ Ke7 5. Qg7+ Ke6 6. Qg4+ <HT>
?



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