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Subject: Re: Can you solve this one ?

Author: Dann Corbit

Date: 21:09:25 04/06/00

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On April 06, 2000 at 23:18:56, Hristo wrote:

>crafty thinks it is a draw after about 22 sec.
>1. Nb4 Ka7 2. Ra6 Kb7 3. Ra5 h3 4.Rb5 Kc7 ...
>It is a nice study ... because after 2.  a1Q 3. Nc6 black have a
>Queen but no time left ot use it.

I think Nb4 may be fool's gold.  See below:

Crafty v17.10

White(1): st 999
search time set to 999.00.
White(1): epdpfga epd.epd epd.out
PFGA: EPD record: 1
end-game phase
              clearing hash tables
              time surplus   0.00  time limit 16:39 (16:39)
         nss  depth   time  score   variation (1)
                8     1.11     --   1. Nc7+
                8     1.42   0.88   1. Nc7+ Ka7 2. Ra6+ Kb7 3. Rxa2 h3
                                    4. Nd5 g2 5. Rb2+ Ka7 6. Rb1 h2 7.
                                    Ra1+ Kb7 8. Rb1+ Kc6
                8     1.63   1.03   1. Nb4 a1=Q 2. Nc6 Qa7+ 3. Nxa7 Kxa7
                                    4. Rg6 Kb7 5. Rd6
                8->   1.66   1.03   1. Nb4 a1=Q 2. Nc6 Qa7+ 3. Nxa7 Kxa7
                                    4. Rg6 Kb7 5. Rd6
                9     1.78     ++   1. Nb4!!
                9     3.26   1.45   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Re2 g2 5. Re7+ Kb6 6. Nd5+ Kc5 7. Re1
                9->   4.29   1.45   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Re2 g2 5. Re7+ Kb6 6. Nd5+ Kc5 7. Re1
               10     5.00     --   1. Nb4
               10     6.29   0.88   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Nd5 g2 5. Rb2+ Ka7 6. Rb1 h2 7. Ra1+
                                    Kb7 8. Rb1+ Kc6
               10->   8.61   0.88   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Nd5 g2 5. Rb2+ Ka7 6. Rb1 h2 7. Ra1+
                                    Kb7 8. Rb1+ Kc6
               11    10.33     --   1. Nb4
               11    12.68   0.00   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Rb2 g2 5. Rb1 h2 6. Nd5+ Kc6 7. Nb4+
                                    Kc5 8. Na6+ Kc4 9. Rc1+ Kd3 <HT>
               11->  17.03   0.00   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Rb2 g2 5. Rb1 h2 6. Nd5+ Kc6 7. Nb4+
                                    Kc5 8. Na6+ Kc4 9. Rc1+ Kd3 <HT>
               12    21.67     --   1. Nb4
               12    30.48  -1.66   1. Nb4 Ka7 2. Ra6+ Kb7 3. Rxa2 h3 4.
                                    Ra6 g2 5. Rh6 g1=Q 6. Rxh3 Qg2 7. Rh4
                                    Kc7
               12    41.25     ++   1. Nb8!!
               12    57.57   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               12->  57.76   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               13    59.62   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               13->   1:14   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               14     1:17   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               14->   1:41   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               15     1:51   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               15->   2:31   0.00   1. Nb8 Ka7 2. Rb4 a1=Q 3. Nc6+ Ka6
                                    4. Nb8+ Ka5 5. Nc6+ Ka6
               16     2:31   1/22   1. Nb8





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