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Subject: Re: pawn endgame position

Author: Dann Corbit

Date: 12:07:39 01/22/01

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On January 22, 2001 at 09:36:53, Steffen Jakob wrote:

>Hossa played a blitz game with Amateur some minutes ago where he got a won
>endgame position. Both sides had a queen and pawns. Hossa was 3 pawns up. Then
>there was the opportunity to exchange the queens resulting in a pawn endgame
>position where Hossa had 3 connected advanced passed pawns and Amateur had no
>passer at all. You can imagine that Hossa was very happy to exchange in this
>line. Unfortunately the 3 passers werent able to force a promotion without the
>help of their king who was far away. On the other hand black could create a
>passer which could not be stopped by white. So in the end Hossa lost this
>"deadly" won position :-)
>
>I am interested if "your" engine could resist to play 46.Qe6+ in a blitz game.
>
>[D]6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w
>
>Best wishes,
>Steffen.
>
>[Event "ICS rated blitz match"]
>[Site "204.178.125.65"]
>[Date "2001.01.22"]
>[Round "-"]
>[White "Hossa"]
>[Black "Amateur"]
>[Result "0-1"]
>[WhiteElo "2508"]
>[BlackElo "2548"]
>[TimeControl "300+2"]
>
>1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. Nf3 h6 7. Bh4 O-O
>8. e3 Nc6 9. Be2 Be6 10. O-O Ne4 11. Bxe7 Qxe7 12. Qb3 Nxc3 13. bxc3 Rab8
>14. Bd3 Rfd8 15. Qc2 Bg4 16. Nd2 Qg5 17. f4 Qf6 18. Nf3 Ne7 19. Ne5 Bh5 20.
>Bh7+ Kh8 21. g4 Bg6 22. Bxg6 Nxg6 23. c4 Nxe5 24. fxe5 Qe6 25. cxd5 Qxg4+
>26. Kh1 Rf8 27. Rf4 Qc8 28. Rg1 Qd7 29. e4 Qe7 30. Qc1 b5 31. Rf3 b4 32.
>Rfg3 Rg8 33. R1g2 a5 34. Qf4 Rbd8 35. Rh3 f5 36. Rxh6+ gxh6 37. Qxh6+ Qh7
>38. Qf6+ Rg7 39. Qxd8+ Qg8 40. Qf6 Qf7 41. Rxg7 Qxg7 42. Qh4+ Kg8 43. exf5
>Qd7 44. Qg5+ Kf8 45. Qf6+ Kg8 46. Qe6+ Qxe6 47. fxe6 Kf8 48. d6 cxd6 49.
>exd6 a4 50. d7 Ke7 51. Kg2 b3 52. axb3 axb3 53. d5 b2 54. Kf3 b1=Q 55. Kf4
>Qd3 56. Ke5 Qe3+ 57. Kf5 Qd4
>{Hossa resigns} 0-1

Crafty needs a full minute.  Hence, we see yet another proof that "blitz chess
is icky"[tm].
;-)

White(1): setboard 6k1/2pq4/5Q2/p2PPP2/1p1P4/8/P6P/7K w
White(1): st 999
search time set to 999.00.
White(1): go
end-game phase
              clearing hash tables
              time surplus   0.00  time limit 16:39 (16:39)
         nss  depth   time  score   variation (1)
                7->   0.38   5.98   1. Qe6+ Qf7 2. Qxf7+ Kxf7 3. h4 Kg7
                                    4. h5 Kh6 5. f6
                8     0.48     --   1. Qe6+
                8     0.56     ++   1. Qe6+!!
                8     1.17   6.62   1. Qe6+ Qf7 2. f6 a4 3. Qc8+ Kh7 4.
                                    Qf5+ Kh6 5. e6 Qf8 6. h4
                8->   1.39   6.62   1. Qe6+ Qf7 2. f6 a4 3. Qc8+ Kh7 4.
                                    Qf5+ Kh6 5. e6 Qf8 6. h4
                9     1.67     --   1. Qe6+
                9     1.98   5.74   1. Qe6+ Qf7 2. f6 Qxe6 3. dxe6 a4 4.
                                    Kg2 b3 5. e7 Kf7 6. e6+ Ke8 7. f7+
                                    Kxe7
                9->   2.73   5.74   1. Qe6+ Qf7 2. f6 Qxe6 3. dxe6 a4 4.
                                    Kg2 b3 5. e7 Kf7 6. e6+ Ke8 7. f7+
                                    Kxe7
               10     3.19     ++   1. Qe6+!!
               10    12.23   6.38   1. Qe6+ Qf7 2. h4 Kf8 3. Qxf7+ Kxf7
                                    4. d6 cxd6 5. exd6 b3 6. axb3 Ke8 7.
                                    h5 Kf7
               10->  13.59   6.38   1. Qe6+ Qf7 2. h4 Kf8 3. Qxf7+ Kxf7
                                    4. d6 cxd6 5. exd6 b3 6. axb3 Ke8 7.
                                    h5 Kf7
               11    15.63     --   1. Qe6+
               11    16.01   4.56   1. Qe6+ Qxe6 2. fxe6 a4 3. d6 cxd6
                                    4. exd6 Kf8 5. d7 Ke7 6. d5 b3 7. d8=R
                                    Kxd8
               11->  58.47   4.56   1. Qe6+ Qxe6 2. fxe6 a4 3. d6 cxd6
                                    4. exd6 Kf8 5. d7 Ke7 6. d5 b3 7. d8=R
                                    Kxd8
               12    59.11     --   1. Qe6+
               12     1:02   2.41   1. Qe6+ Qxe6 2. fxe6 a4 3. d6 cxd6
                                    4. exd6 Kf8 5. d7 Ke7 6. d5 b3 7. d6+
                                    Kd8 8. e7+ Kxd7 9. e8=R Kxe8
               12     1:03     ++   1. e6!!
               12     2:31   5.37   1. e6 Qxd5+ 2. Kg1 Qe4 3. Qd8+ Kg7
                                    4. Qxc7+ Kg8 5. Qf7+ Kh8 6. Qf6+ Kh7
                                    7. e7 Qg4+ 8. Kf2 Qf4+ 9. Ke1 Qe3+
                                    10. Kd1 Qg1+ 11. Ke2 Qxh2+ 12. Ke3
                                    Qg3+ 13. Ke4
               12->   2:38   5.37   1. e6 Qxd5+ 2. Kg1 Qe4 3. Qd8+ Kg7
                                    4. Qxc7+ Kg8 5. Qf7+ Kh8 6. Qf6+ Kh7
                                    7. e7 Qg4+ 8. Kf2 Qf4+ 9. Ke1 Qe3+
                                    10. Kd1 Qg1+ 11. Ke2 Qxh2+ 12. Ke3
                                    Qg3+ 13. Ke4
               13     3:06   5.35   1. e6 Qxd5+ 2. Kg1 Qe4 3. Qd8+ Kg7
                                    4. Qxc7+ Kg8 5. Qf7+ Kh8 6. Qf6+ Kh7
                                    7. e7 Qg4+ 8. Kf2 Qf4+ 9. Ke2 Qxh2+
                                    10. Kd3 Qh3+ 11. Kc4 Qf1+ 12. Kc5 Qc1+
                                    13. Kd6 Qe3
               13->   3:29   5.35   1. e6 Qxd5+ 2. Kg1 Qe4 3. Qd8+ Kg7
                                    4. Qxc7+ Kg8 5. Qf7+ Kh8 6. Qf6+ Kh7
                                    7. e7 Qg4+ 8. Kf2 Qf4+ 9. Ke2 Qxh2+
                                    10. Kd3 Qh3+ 11. Kc4 Qf1+ 12. Kc5 Qc1+
                                    13. Kd6 Qe3
               14     4:30   1/23*  1. e6




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