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Subject: Re: Difficult puzzle for computers

Author: Dieter Buerssner

Date: 18:15:56 08/05/02

Go up one level in this thread


On August 05, 2002 at 18:39:45, Roy Eassa wrote:

>White to move and draw:
>
> 7b/8/kq6/8/8/1N2R3/K2P4/8 w - - 0 1

Yace, K6-2 475, 20M hash, running in the background with about 60% CPU time:

   3981665  38.534  -4.28 10t  1. Kb1 Bd4 2. Rg3 Kb7 3. Rd3 Qg6 4. Kc2 Bg7 5.
                               Na5+ Kb6 6. Nb3 {-431}
   6306157  1:01.8  -4.28 10.  1. Kb1 Bd4 2. Rg3 Kb7 3. Rd3 Qg6 4. Kc2 Bg7 5.
                               Na5+ Kb6 6. Nb3 {-431}
   8050147  1:25.0  -4.31 11t  1. Kb1 Bd4 2. Rg3 Kb7 3. Rd3 Qg6 4. Kc2 Be5 5.
                               Na5+ Kc7 6. Nc4 Bd4 {-431}
  11731696  2:06.0  -4.30 11t+ 1. Nd4 Qf6
  11821100  2:06.9  -3.88 11++ 1. Nd4 Kb7 2. Rb3 Ka7
  11839527  2:07.2  -2.88 11++ 1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Bd4
  11931506  2:07.9   0.00 11t  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  11993560  2:08.6   0.00 11.  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  12343365  2:11.5   0.00 12t  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  12550206  2:13.7   0.00 12.  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  13215720  2:20.1   0.00 13t  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  13636282  2:24.0   0.00 13.  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  15045666  2:36.1   0.00 14t  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
  15931424  2:45.3   0.00 14.  1. Nd4 Qc5 2. Ra3+ Kb6 3. Rb3+ Ka5 4. Rb5+ Qxb5
                               5. Nxb5 Kxb5 {EGTB} 6. d3 Bg7 7. d4 Bf8 8. d5
                               Bg7 9. d6 Bf8 10. d7 Be7! 11. d8=Q Bxd8! {No
                               mating material} {-350}
Regards,
Dieter




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