Author: Robert Hyatt
Date: 06:04:35 03/14/00
Go up one level in this thread
On March 13, 2000 at 20:38:44, Vincent Lejeune wrote:
>[D]1r6/2p2pk1/6p1/2QpP1q1/P2P4/5R2/5PP1/6K1 w - - 0 1
>
>
>In this position Junior 6 played 42. Qc2!! all other programs that i've tested
>(Crafty 17.07, Hiarcs 7.32, Fritz6 light 3 min on a celeron 450) evaluate Rxf7+
>two pawns above Qc2, but 42. Rxf7+ Kxf7 43. Qxc7+ Ke6 44. Qxb8 seems to be a
>very deep forced draw (see line in game below)
>
>So, how Junior 6 can see this repetition draw :
You apparently aren't searching loong enough. Here is what I get (Qc2 at
20 seconds):
(2) 10 1.92 2.15 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Kg3 Qg5+ <HT>
(2) 10-> 2.93 2.15 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Kg3 Qg5+ <HT>
11 3.89 -- 1. Rxf7+
11 5.18 1.18 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke3 Qe4+ 8. Kd2 Qxd4+ 9. Ke2
Qe4+ 10. Kf1 Qc4+ 11. Ke1 Qe4+ 12.
Kd1 Qxa4+
11 21.06 1.35 1. Qc2 c6 2. g3 Qh5 3. Rf6 Rh8 4. Kf1
c5 5. dxc5 Qxe5 6. Rd6
11-> 21.06 1.35 1. Qc2 c6 2. g3 Qh5 3. Rf6 Rh8 4. Kf1
c5 5. dxc5 Qxe5 6. Rd6
12 27.06 1.41 1. Qc2 c6 2. g3 Qh5 3. Rb3 Rxb3 4.
Qxb3 Qe2 5. Qb4 Qe4 <HT>
(2) 12-> 34.69 1.41 1. Qc2 c6 2. g3 Qh5 3. Rb3 Rxb3 4.
Qxb3 Qe2 5. Qb4 Qe4 <HT>
13 1:01 1.31 1. Qc2 c6 2. a5 Qh4 3. Qd1 Rb4 4. Rd3
Qd8 5. Qa1 Qb8 6. Kh2 Qb5 7. Rh3
13 1:17 1.70 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qf4+ 10. Kd3 Qe4+ 11. Kc3 Qe1+ 12.
Kc2 Qxf2+ 13. Kd3 Qg3+ 14. Kd2 Qxg2+
(2) 13-> 1:17 1.70 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qf4+ 10. Kd3 Qe4+ 11. Kc3 Qe1+ 12.
Kc2 Qxf2+ 13. Kd3 Qg3+ 14. Kd2 Qxg2+
14 1:27 1.59 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qf4+ 10. Kd3 Qe4+ 11. Kc3 Qe1+ 12.
Kc2 Qxf2+ 13. Kd3 Qg3+ 14. Kd2 Qxg2+
15. Ke3 Qe4+
14-> 1:48 1.59 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qf4+ 10. Kd3 Qe4+ 11. Kc3 Qe1+ 12.
Kc2 Qxf2+ 13. Kd3 Qg3+ 14. Kd2 Qxg2+
15. Ke3 Qe4+
15 2:18 1.51 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qxd4+ 10. Ke1 Qc3+ 11. Ke2 Qc4+ 12.
Kf3 Kf5 13. Qf8+ Kxe5 14. Qg7+ Kf5
15. Qd7+ Ke5 <HT>
15-> 3:22 1.51 1. Rxf7+ Kxf7 2. Qxc7+ Ke6 3. Qxb8
Qc1+ 4. Kh2 Qh6+ 5. Kg3 Qg5+ 6. Kf3
Qf5+ 7. Ke2 Qc2+ 8. Ke3 Qe4+ 9. Kd2
Qxd4+ 10. Ke1 Qc3+ 11. Ke2 Qc4+ 12.
Kf3 Kf5 13. Qf8+ Kxe5 14. Qg7+ Kf5
15. Qd7+ Ke5 <HT>
It likes Rf7, then Qc2, then back to Rf7. Notice that the scores are not
very different. Crafty doesn't see a draw at any tournament time control
(ie it might at depth=16) but the difference between qc2 and rf7 is a small
positional thing, which means junior might have seen the draw, or it might just
like the resulting position after Qc2 a little better... (btw 16 plies was
done at 5:30 and no draw there for Rxf7, score=+1.30...
>
>- Evaluation (queen against a king in open lines) ?
>- Full check extension (each check extend one ply, too big tree explosion in my
>sens) ?
>- Reduced check extension (one check extend some plies,but this is 32 plies deep
>!) ?
>
>Can someone test this position in junior 6 and give analysis please ?
>This would help to understand the mechanism to find 42. Qc2!!
>
>There's the game with the drawing line :
>
>[Event "ICS Rated standard match"]
>[Site "192.168.0.2"]
>[Date "2000.03.12"]
>[Round "?"]
>[White "Deep Junior"]
>[Black "Xie Jun"]
>[Result "1-0"]
>[ECO "C92"]
>[WhiteElo "2666"]
>[BlackElo "2647"]
>[Annotator "DRAW ???"]
>[PlyCount "99"]
>[EventDate "2000.??.??"]
>
>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3
>O-O 9. h3 a5 10. d4 a4 11. Bc2 exd4 12. Nxd4 Nxd4 13. cxd4 d5 14. e5 Ne4 15.
>Qe2 Rb8 16. Nc3 Nxc3 17. bxc3 Bd7 18. Qd3 g6 19. Qf3 Be6 20. Bh6 Re8 21. Qf4
>Rb6 22. Re3 Qd7 23. Bd1 b4 24. cxb4 Rxb4 25. a3 Rb2 26. Rc3 Reb8 27. Rac1 R8b7
>28. h4 Rb1 29. h5 Rxc1 30. Qxc1 Bf5 31. Bc2 Bxc2 32. Qxc2 Qg4 33. Qxa4 Rb1+ 34.
>Kh2 Rb8 35. Qa7 Rc8 36. hxg6 hxg6 37. a4 Bf8 38. Bxf8 Kxf8 39. Rf3 Kg7 40. Kg1
>Qg5 41. Qc5 Rb8 42. Qc2 (42. Rxf7+ Kxf7 43. Qxc7+ Ke6 44. Qxb8 Qc1+ 45. Kh2
>Qf4+ 46. Kh3 Qh6+ 47. Kg3 Qg5+ 48. Kf3 Qf5+ 49. Ke3 Qe4+ 50. Kd2 Qxd4+ 51. Ke2
>Qc4+ 52. Ke3 Qe4+ 53. Kd2 Qf4+ 54. Ke2 Qc4+ 55. Ke3 Qe4+ 56. Kd2 Qf4+ 57. Kd3
>Qc4+ 58. Kd2 Qf4+) 42... Rb4 43. e6 Rc4 44. Rxf7+ Kg8 45. Qb3 Qc1+ 46. Kh2 Qh6+
>47. Kg3 Qg5+ 48. Kf3 Qh5+ 49. Ke3 Qg5+ 50. Kd3 (50. Kd3 Qd8 51. e7 Qe8 52. Rf8+
>Qxf8 53. exf8=Q+ Kxf8 54. a5) 1-0
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