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Subject: Re: Simplifications and endgame technique

Author: Dann Corbit

Date: 19:15:47 01/05/99

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On January 05, 1999 at 21:49:10, Albert Silver wrote:

>This game was played today:
>
>Of note (apart from Morozevitch's monstrous 8/9 - lad has a knack for monstrous
>scores doesn't he?) were a couple of moves. How many computers see that
>44...Qxc3 would lose (and how long does it take them to see it)? And how long
>does it take them to see the winning 45.h5!
>
>[Event "Pamplona, 1998"]
>[Site "Pamplona"]
>[Date "1999.01.05"]
>[Round "9"]
>[White "Morozevich, A."]
>[Black "Van Welly, L."]
>[Result "1-0"]
>[ECO "B90"]
>[WhiteElo "2625"]
>[BlackElo "2635"]
>[PlyCount "101"]
>[EventDate "1998.12.27"]
>
>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f3 e5 7. Nb3 Be6 8. Be3
>Nbd7 9. Qd2 h5 10. a4 Be7 11. Be2 Nb6 12. O-O Nc4 13. Bxc4 Bxc4 14. Rfd1 O-O
>15. Bg5 Bxb3 16. Bxf6 Bxf6 17. cxb3 Qb6+ 18. Kh1 Qxb3 19. Nd5 Rfc8 20. Nxf6+
>gxf6 21. Qh6 Qe6 22. Rd2 Rc6 23. Rg1 f5 24. Qxh5 fxe4 25. fxe4 Qg6 26. Qh4 Kg7
>27. Rd3 Rh8 28. Qe7 {} 28... Rh6 29. Rf1 Qe6 30. Qxb7 Rf6 31. Rg3+ Kf8 32. Rg1
>Qc8 33. Qb3 Rc1 34. Rc3 Rxc3 35. bxc3 Qc6 36. Qb4 Rf4 37. Re1 Kg7 38. h3 a5 39.
>Qxa5 Rxe4 40. Rxe4 Qxe4 41. Qb4 Qe1+ 42. Kh2 d5 43. Qg4+ Kf6 44. h4 Ke7 45. h5
>Qxc3 46. h6 e4 47. Qg7 Qe3 48. Qe5+ Kd7 49. Qxd5+ Ke7 50. Qe5+ Kd7 51. Qf6 1-0
>
>                            Albert Silver
Using Crafty, what move will be chosen by black for 44.?

White(1): setboard 8/5p2/5k2/3pp3/P5QP/2P5/6PK/4q3 b - -
              puzzling over a move to ponder.
end-game phase
              clearing hash tables
              depth   time  score   variation (1)
                5     0.10   0.35   1. ... Qxc3 2. g3 Qd2+ 3. Kh3 e4 4.
                                    Qd7
                5->   0.13   0.35   1. ... Qxc3 2. g3 Qd2+ 3. Kh3 e4 4.
                                    Qd7
                6     0.29     --   1. ... Qxc3
                6     0.30  -0.13   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd4
                6->   0.43  -0.13   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd4
                7     0.52  -0.24   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd2+ 8. Kg3 Qf4+
                7->   0.75  -0.24   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd2+ 8. Kg3 Qf4+
                8     2.46  -0.25   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd2+ 8. Kh3 Qd7+ 9. Kg3 Kf5
                8->   3.21  -0.25   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. a5 d3 5. a6 d2 6. a7 d1=Q 7. a8=Q
                                    Qd2+ 8. Kh3 Qd7+ 9. Kg3 Kf5
                9     3.45     --   1. ... Qxc3
                9     4.04  -1.62   1. ... Qxc3 2. Qf3+ Qxf3 3. gxf3 d4
                                    4. Kg1 d3 5. Kf2 Ke7 6. Ke3 e4 7. fxe4
                9    17.15     ++   1. ... Ke7!!
(17 seconds to choose the same move as the GM.  It sticks with it too.)

                9    24.48  -0.66   1. ... Ke7 2. Qb4+ Ke6 3. g3 Qf2+ 4.
                                    Kh3 Qf1+ 5. Kh2 Qe2+ <HT>
                9->  32.01  -0.66   1. ... Ke7 2. Qb4+ Ke6 3. g3 Qf2+ 4.
                                    Kh3 Qf1+ 5. Kh2 Qe2+ <HT>
decreased probe depth to 31
               10    59.50  -0.82   1. ... Ke7 2. Qg3 Qe4 3. a5 Ke6 4.
                                    a6 Qa4 5. Qd3 e4 6. Qe2 Qd7

h5! took two and one half minutes:
White(1): setboard 8/4kp2/8/3pp3/P5QP/2P5/6PK/4q3 w - -
White(1): go
end-game phase
              time surplus   0.00  time limit 12:50 (12:50)
              depth   time  score   variation (1)
                5     0.15   0.94   1. Qb4+ Ke6 2. Qb6+ Kf5 3. g4+ Ke4
                                    4. Qf6 Qd2+ 5. Kg1
                5->   0.19   0.94   1. Qb4+ Ke6 2. Qb6+ Kf5 3. g4+ Ke4
                                    4. Qf6 Qd2+ 5. Kg1
                6     0.63   0.62   1. Qb4+ Ke6 2. h5 f5 3. a5 e4 4. Qd4
                6->   1.15   0.62   1. Qb4+ Ke6 2. h5 f5 3. a5 e4 4. Qd4
                7     1.93   0.51   1. Qb4+ Ke6 2. h5 e4 3. Qb6+ Kf5 4.
                                    Qd8 Qd2 5. a5
                7     4.00   0.72   1. c4 d4 2. h5 Qd2 3. Qe4 Ke6 4. c5
                7->   4.19   0.72   1. c4 d4 2. h5 Qd2 3. Qe4 Ke6 4. c5
decreased probe depth to 12
                8     8.40   0.65   1. c4 d4 2. c5 Qc1 3. Qc8 Qc4 4. c6
                                    e4 5. a5
                8->  11.27   0.65   1. c4 d4 2. c5 Qc1 3. Qc8 Qc4 4. c6
                                    e4 5. a5
decreased probe depth to 11
                9    22.29   0.41   1. c4 d4 2. h5 d3 3. h6 d2 4. h7 d1=Q
                                    5. Qxd1 Qxd1 6. h8=Q f6 7. Qh7+ Ke6
                                    8. Qg8+ Kf5 9. a5
                9    53.04   0.44   1. Qb4+ Kf6 2. Qd6+ Kf5 3. Qd7+ Kf6
                                    4. Qh3 e4 5. g4 Qa1 6. g5+ Ke5 7. Qd7
                9    57.31     ++   1. Qg3!!
                9->  59.75   0.83   1. Qg3
decreased probe depth to 10
               10     1:04   0.98   1. Qg3 Qe2 2. Kh3 Qe4 3. Qf3 f5 4.
                                    a5 Qg4+ 5. Qxg4 fxg4+ 6. Kxg4 Kd6
               10     2:26     ++   1. h5!!
               10     2:30   1/24   1. h5



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