Can it be Saved?

Discussion of anything and everything relating to chess playing software and machines.

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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Can it be Saved?

Post by peter »

kingliveson wrote: Rg8+ is not the best move as it immediately gives more power to an already empowered Bishop while leaving the white King exposed to the attacking Rooks.
So you're in doubt yourself again?
:)
1.Kb3 you've already tried, 1.Kg8 was Eelco's favorite too, if I remember right, considering 1.Kh8 too?
If somebody can bring any variant leading to remis (besides myself, which was wrong, I guess :)) let's see, if not, it's propably lost, isn't it?
Peter.
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kingliveson

Re: Can it be Saved?

Post by kingliveson »

peter wrote:
kingliveson wrote: Rg8+ is not the best move as it immediately gives more power to an already empowered Bishop while leaving the white King exposed to the attacking Rooks.
So you're in doubt yourself again?
:)
1.Kb3 you've already tried, 1.Kg8 was Eelco's favorite too, if I remember right, considering 1.Kh8 too?
If somebody can bring any variant leading to remis (besides myself, which was wrong, I guess :)) let's see, if not, it's propably lost, isn't it?
Rh8+ seems to be the better move, but whether it leads to draw, no way to tell.
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Can it be Saved?

Post by peter »

kingliveson wrote: Rh8+ seems to be the better move, but whether it leads to draw, no way to tell.
So than just one more for the other side.
:)

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rh8+ Kc7 2. Kb3 Rc1 3. Kb2 Rcc5 4. Rh2 Rb5+ 5. Kc3 Rec5+ 6. Kd4 Rd5+ 7. Ke3
Re5+ 8. Kf3 Rf5+ 9. Ke4 Rbe5+ 10. Kd4 Rxa5 11. Rd2 Ra8 12. Rd3 Rd8 13. Kc3 Kc6
14. Rd4 Rf3+ 15. Rd3 Rf6 16. Rd1 Rh6 17. Re7 Rh5 18. Rd4 Rg5 19. Rd3 Rg4 20.
Rd1 Rg6 21. Rd4 Kc7 22. Rd5 Rg1 23. Rd2 Rg5 24. Rd4 Rg3+ 25. Kc4 Kc6 26. Rd3
Rg1 27. Kc3 Ra1 28. Re6+ Kc7 29. Re7 Rc1+ 30. Kb2 Rg1 31. Kc3 Rb1 32. Kc4 Rf1
33. Rd2 Ra1 34. Rd3 Ra6 35. Kc5 Rc6+ 36. Kd5 Rc1 37. Ke5 Re1+ 38. Kf6 Rf1+ 39.
Ke5 Rf5+ 40. Kd4 Rh5 41. Kc4 Kc6 42. Kc3 Ra5 43. Re6+ Kc7 44. Re7 Ra2 45. Rd2
Ra6 46. Rd4 Raa8 47. Kc4 Kc6 48. Kc3 Ra3+ 49. Kd2 Ra1 50. Re1 Ra5 51. Re6+ Kc7
52. Rc4+ Kb8 53. Rb6+ Ka8 54. Rc7 Bc8+ 55. Ke3 Re8+ 56. Kd4 Be6 57. Rg7 Bf5 58.
Rbb7 Rh8 59. Rbe7 Rb8 60. Rc7 Ra1 1/2-1/2

Don't really think it depends so much on the first move but anyhow, if it's possible to draw against Deep Fritz 10 with complete 5 MOB and 40 moves in 90 min., there yet won't be a win without white error.
Peter.
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kingliveson

Re: Can it be Saved?

Post by kingliveson »

peter wrote:
kingliveson wrote: Rh8+ seems to be the better move, but whether it leads to draw, no way to tell.
So than just one more for the other side.
:)

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rh8+ Kc7 2. Kb3 Rc1 3. Kb2 Rcc5 4. Rh2 Rb5+ 5. Kc3 Rec5+ 6. Kd4 Rd5+ 7. Ke3
Re5+ 8. Kf3 Rf5+ 9. Ke4 Rbe5+ 10. Kd4 Rxa5 11. Rd2 Ra8 12. Rd3 Rd8 13. Kc3 Kc6
14. Rd4 Rf3+ 15. Rd3 Rf6 16. Rd1 Rh6 17. Re7 Rh5 18. Rd4 Rg5 19. Rd3 Rg4 20.
Rd1 Rg6 21. Rd4 Kc7 22. Rd5 Rg1 23. Rd2 Rg5 24. Rd4 Rg3+ 25. Kc4 Kc6 26. Rd3
Rg1 27. Kc3 Ra1 28. Re6+ Kc7 29. Re7 Rc1+ 30. Kb2 Rg1 31. Kc3 Rb1 32. Kc4 Rf1
33. Rd2 Ra1 34. Rd3 Ra6 35. Kc5 Rc6+ 36. Kd5 Rc1 37. Ke5 Re1+ 38. Kf6 Rf1+ 39.
Ke5 Rf5+ 40. Kd4 Rh5 41. Kc4 Kc6 42. Kc3 Ra5 43. Re6+ Kc7 44. Re7 Ra2 45. Rd2
Ra6 46. Rd4 Raa8 47. Kc4 Kc6 48. Kc3 Ra3+ 49. Kd2 Ra1 50. Re1 Ra5 51. Re6+ Kc7
52. Rc4+ Kb8 53. Rb6+ Ka8 54. Rc7 Bc8+ 55. Ke3 Re8+ 56. Kd4 Be6 57. Rg7 Bf5 58.
Rbb7 Rh8 59. Rbe7 Rb8 60. Rc7 Ra1 1/2-1/2

Don't really think it depends so much on the first move but anyhow, if it's possible to draw against Deep Fritz 10 with complete 5 MOB and 40 moves in 90 min., there yet won't be a win without white error.
I think the initial move from this position is very crucial. It is very tight and there is no room for error. 2. Kb3? and Rc1? Instead of Rc1, Rd4. Will play out starting from Rh8+ with 90+30 time control.
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

Code: Select all

   1	00:00	          82	0	-3.77	1.Rxd7 Rb5+ 2.Ka3 Kxd7
   1	00:00	          91	0	-0.33	1.Rg8+ Kc7
   1	00:00	         115	0	-0.28	1.Rh8+ Kc7
   1	00:00	         206	0	-0.11	1.a6
   1	00:00	         211	0	-0.11	1.a6
   2	00:00	         277	0	-0.11	1.a6 Rb5+ 2.Ka3
   2	00:00	         621	0	-0.11	1.a6 Rb5+ 2.Ka3
   3	00:00	       1.147	0	-0.25	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2
   3	00:00	       1.254	0	-0.25	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2
   4	00:00	       2.454	0	-0.19	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rb4
   4	00:00	       2.672	0	-0.19	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rb4
   5	00:00	       4.159	0	-0.23	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Rh8+ Kc7
   5	00:00	       4.542	0	-0.23	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Rh8+ Kc7
   6	00:00	       6.662	0	-0.26	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kb8 5.Rhh7
   6	00:00	       7.075	0	-0.26	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kb8 5.Rhh7
   7	00:00	       9.202	0	-0.29	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8
   7	00:00	      10.705	0	-0.29	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8
   8	00:00	      17.451	1.090.000	-0.29	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8
   8	00:00	      19.394	1.212.000	-0.29	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8
   9-	00:00	      89.092	1.895.000	-0.37	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8 6.Rff7 Rd6 7.a7+ Ka8
   9-	00:00	     147.169	2.373.000	-0.45	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.Re7 Kc7 5.Rf6 Kb8 6.Rff7 Rd6 7.a7+ Ka8
   9	00:00	     180.061	2.308.000	-0.42	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.a7 Rd2+ 5.Ka3 Ra5+ 6.Kb4 Rxa7 7.Rhh7 Kc7 8.Kc3 Raa2
   9	00:00	     180.755	2.317.000	-0.42	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Rd3 4.a7 Rd2+ 5.Ka3 Ra5+ 6.Kb4 Rxa7 7.Rhh7 Kc7 8.Kc3 Raa2
  10	00:00	     246.084	2.617.000	-0.44	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Rd5 6.Re7 Rd2+ 7.Kb1 Rf3 8.Kc1
  10	00:00	     284.241	2.607.000	-0.44	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Rd5 6.Re7 Rd2+ 7.Kb1 Rf3 8.Kc1
  11+	00:00	     456.916	3.263.000	-0.36	1.Rh8+ Kc7 2.Rh3 Rb5+ 3.Rb3 Rbc5 4.a6 Rc2+ 5.Kb1
  11-	00:00	     657.936	3.518.000	-0.52	1.Rh8+ Kc7 2.Rh3 Rb5+ 3.Rb3 Rd5 4.Rc3 Rd2+ 5.Kb3
  11	00:00	     725.570	3.574.000	-0.50	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Re2+ 6.Ka3 Rd2 7.a7 Ra5+ 8.Kb3 Rxa7 9.Rh6 Re2 10.Kc3 Ra3+ 11.Kb4
  11	00:00	     726.994	3.581.000	-0.50	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Re2+ 6.Ka3 Rd2 7.a7 Ra5+ 8.Kb3 Rxa7 9.Rh6 Re2 10.Kc3 Ra3+ 11.Kb4
  12	00:00	     789.584	3.621.000	-0.50	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Re2+ 6.Ka3 Rd2 7.a7 Ra5+ 8.Kb3 Rxa7 9.Rh6 Re2 10.Kc3 Ra3+ 11.Kb4
  12	00:00	     847.347	3.621.000	-0.50	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rhh7 Re2+ 6.Ka3 Rd2 7.a7 Ra5+ 8.Kb3 Rxa7 9.Rh6 Re2 10.Kc3 Ra3+ 11.Kb4
  13+	00:00	   2.628.426	4.813.000	-0.42	1.Kb3
  13-	00:01	   3.078.018	4.809.000	-0.58	1.Kb3
  13	00:01	   3.280.237	4.781.000	-0.59	1.Kb3 Rc7 2.Rg8+ Kb7 3.Rb6+ Ka7 4.Rgg6 Rxa5 5.Rgf6 Be8 6.Rh6 Bf7+ 7.Kb4 Ra2 8.Rhc6 Re7 9.Kc3 Ra4 10.Rh6 Re3+ 11.Kd2
  13	00:01	   4.664.129	4.983.000	-0.59	1.Kb3 Rc7 2.Rg8+ Kb7 3.Rb6+ Ka7 4.Rgg6 Rxa5 5.Rgf6 Be8 6.Rh6 Bf7+ 7.Kb4 Ra2 8.Rhc6 Re7 9.Kc3 Ra4 10.Rh6 Re3+ 11.Kd2
  14	00:01	   5.877.491	5.233.000	-0.56	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rh2 Re6 6.Ka1 Rd5 7.a7 Ra5+ 8.Kb2 Rxa7 9.Rc2+ Kb8 10.Rh2 Rb6+ 11.Kc3 Ra3+ 12.Kd4
  14	00:01	   5.961.877	5.166.000	-0.56	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rh2 Re6 6.Ka1 Rd5 7.a7 Ra5+ 8.Kb2 Rxa7 9.Rc2+ Kb8 10.Rh2 Rb6+ 11.Kc3 Ra3+ 12.Kd4
  15	00:01	   6.931.930	5.352.000	-0.54	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rh2 Rd5 6.Kb2 Kb6 7.Rh6+ Bc6 8.Rgg6 Rb5+ 9.Kc2 Rc5+ 10.Kb2 Rec3 11.Rh5 Rc2+ 12.Kb3 R5c3+ 13.Kb4 Rc4+ 14.Kb3 Kxa6
  15	00:01	   7.194.972	5.302.000	-0.54	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rh2 Rd5 6.Kb2 Kb6 7.Rh6+ Bc6 8.Rgg6 Rb5+ 9.Kc2 Rc5+ 10.Kb2 Rec3 11.Rh5 Rc2+ 12.Kb3 R5c3+ 13.Kb4 Rc4+ 14.Kb3 Kxa6
  16	00:01	   8.587.065	5.504.000	-0.54	1.a6 Rb5+ 2.Ka3 Rc3+ 3.Ka2 Re3 4.Rh8+ Kc7 5.Rh2 Rd5 6.Kb2 Kb6 7.Rh6+ Bc6 8.Rgg6 Rb5+ 9.Kc2 Rc5+ 10.Kb2 Rec3 11.Rh5 Rc2+ 12.Kb3 R5c3+ 13.Kb4 Rc4+ 14.Kb3 Kxa6
  16+	00:02	  10.078.774	5.668.000	-0.46	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rg6+ Kc7 6.Rg7 Ra6
  16	00:02	  10.139.956	5.652.000	-0.46	1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6 5.Rc3+ Kb7 6.Rb3+ Ka7 7.Rb6 Rdd5 8.Kc3 Re3+ 9.Kc4 Rxa5 10.Rb1 Re4+ 11.Kd3
  16	00:02	  10.348.411	5.621.000	-0.46	1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6 5.Rc3+ Kb7 6.Rb3+ Ka7 7.Rb6 Rdd5 8.Kc3 Re3+ 9.Kc4 Rxa5 10.Rb1 Re4+ 11.Kd3
  17-	00:02	  14.223.651	5.807.000	-0.54	1.Rh8+ Kc7 2.Kb3 Rc1 3.Kb2 Rc6 4.Rh3 Rd6 5.Rc3+ Kb7 6.Rb3+ Ka7 7.Rb6 Rdd5 8.Kc3 Re3+ 9.Kc4 Rxa5 10.Rb1 Re4+ 11.Kd3
  17	00:03	  17.807.775	6.040.000	-0.55	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rg6+ Kb7 8.Rb3+ Kc7 9.Rc3+ Kd8 10.Rg7 Rf2+ 11.Kb3 Rb5+ 12.Kc4 Rf4+ 13.Kd3 Rd5+ 14.Ke2
  17	00:03	  20.467.497	6.102.000	-0.55	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rg6+ Kb7 8.Rb3+ Kc7 9.Rc3+ Kd8 10.Rg7 Rf2+ 11.Kb3 Rb5+ 12.Kc4 Rf4+ 13.Kd3 Rd5+ 14.Ke2
  18	00:04	  22.711.109	6.168.000	-0.55	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rg6+ Kb7 8.Rb3+ Kc7 9.Rc3+ Kb8 10.Rb3+ Kc8 11.Rc3+ Kd8 12.Rg7 Rf2+ 13.Kb3 Rb5+ 14.Kc4 Rf4+ 15.Kd3 Rd5+ 16.Ke2
  18	00:04	  23.727.226	6.132.000	-0.55	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rg6+ Kb7 8.Rb3+ Kc7 9.Rc3+ Kb8 10.Rb3+ Kc8 11.Rc3+ Kd8 12.Rg7 Rf2+ 13.Kb3 Rb5+ 14.Kc4 Rf4+ 15.Kd3 Rd5+ 16.Ke2
  19	00:04	  27.291.915	6.271.000	-0.48	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Ref3 Rh4 8.Rg6+ Kb7 9.Rb3+ Ka7 10.Rd6 Rh7 11.Kc3 Re7 12.Kd4 Bf5 13.Kc3
  19	00:05	  28.908.168	6.239.000	-0.48	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Ref3 Rh4 8.Rg6+ Kb7 9.Rb3+ Ka7 10.Rd6 Rh7 11.Kc3 Re7 12.Kd4 Bf5 13.Kc3
  20	00:05	  32.082.009	6.327.000	-0.48	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rc3+ Kb7 8.Rb3+ Kc7 9.Rbc3+ Kb6 10.Rb3+ Ka7 11.Ra3 Ba4 12.Rg7+ Kb8 13.Rd3 Rb5+ 14.Kc1
  20	00:06	  35.127.632	6.307.000	-0.48	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Re4 6.Rbe3 Rf4 7.Rc3+ Kb7 8.Rb3+ Kc7 9.Rbc3+ Kb6 10.Rb3+ Ka7 11.Ra3 Ba4 12.Rg7+ Kb8 13.Rd3 Rb5+ 14.Kc1
  21-	00:09	  57.122.279	6.491.000	-0.56	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rd6 Rh7 10.Kc3 Rf5 11.Rb2 Rh3+ 12.Kd4 Rh4+ 13.Ke3 Re5+ 14.Kf3
  21	00:11	  71.522.176	6.577.000	-0.62	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rg7 Rd5 10.Rf7 Ka6 11.Rf2 Re4
  21	00:13	  87.180.634	6.574.000	-0.62	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rg7 Rd5 10.Rf7 Ka6 11.Rf2 Re4
  22	00:15	  98.994.074	6.637.000	-0.61	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rb2 Rh5 13.Rd6 Bb5 14.Ke3 Kb7 15.Kf4 Rc4+ 16.Kg3 Rg5+ 17.Kf3 Rc3+ 18.Kf4
  22	00:19	 126.113.578	6.681.000	-0.61	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rb2 Rh5 13.Rd6 Bb5 14.Ke3 Kb7 15.Kf4 Rc4+ 16.Kg3 Rg5+ 17.Kf3 Rc3+ 18.Kf4
  23	00:25	 167.931.022	6.783.000	-0.64	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Bc6 13.Ke5 Rc2 14.Rf1 Bb7 15.Ra1+ Kb8 16.Ra6 R7c5+ 17.Kf4 Rf2+ 18.Kg3
  23	00:34	 228.404.027	6.781.000	-0.64	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Bc6 13.Ke5 Rc2 14.Rf1 Bb7 15.Ra1+ Kb8 16.Ra6 R7c5+ 17.Kf4 Rf2+ 18.Kg3
  24	00:43	 295.890.564	6.827.000	-0.65	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Bc6 13.Ke5 Rc8 14.Rb4 Re2+ 15.Kd6 Bb7 16.Rf7 Rc6+ 17.Kd7 Rc3
  24	00:58	 394.614.776	6.809.000	-0.65	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Bc6 13.Ke5 Rc8 14.Rb4 Re2+ 15.Kd6 Bb7 16.Rf7 Rc6+ 17.Kd7 Rc3
  25	01:04	 442.708.051	6.863.000	-0.64	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Rh4+ 13.Kd5 Rh5+ 14.Kd4 Bc6 15.Rd6 Rh2 16.Rb1 Rc8 17.Rf6 Rh4+ 18.Ke3 Rg4 19.Rd6 Re8+ 20.Kd2
  25	01:14	 508.424.952	6.842.000	-0.64	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.Rf6 Rh4+ 13.Kd5 Rh5+ 14.Kd4 Bc6 15.Rd6 Rh2 16.Rb1 Rc8 17.Rf6 Rh4+ 18.Ke3 Rg4 19.Rd6 Re8+ 20.Kd2
  26	01:42	 708.189.568	6.925.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc6 14.Re6 Rc2 15.Kd3 Rc1 16.Rg6 Rd7+ 17.Ke3 Rc3+ 18.Kf4 Rf7+ 19.Kg4
  26	02:25	1.009.604.959	6.954.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc6 14.Re6 Rc2 15.Kd3 Rc1 16.Rg6 Rd7+ 17.Ke3 Rc3+ 18.Kf4 Rf7+ 19.Kg4
  27	02:54	1.220.478.690	7.009.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc6 14.Re6 Rd7+ 15.Ke3 Rc2 16.Rf6 Rc3+ 17.Kf4 Re7 18.Rg6 Rf7+ 19.Kg4
  27	03:29	1.457.477.475	6.986.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc6 14.Re6 Rd7+ 15.Ke3 Rc2 16.Rf6 Rc3+ 17.Kf4 Re7 18.Rg6 Rf7+ 19.Kg4
  28	04:17	1.803.593.719	7.021.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rd6 Rh7 10.Rb4 Rf5 11.Ka3 Be8 12.Rb3 Ra5+ 13.Kb2 Rc5 14.Ka3 Bf7 15.Re3 Bd5 16.Rd3 Bc6 17.Rb3 Rc7 18.Rb4 Rf7 19.Rb3 Rc4 20.Rg6
  28	05:13	2.189.576,826	7.005.000	-0.66	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rd6 Rh7 10.Rb4 Rf5 11.Ka3 Be8 12.Rb3 Ra5+ 13.Kb2 Rc5 14.Ka3 Bf7 15.Re3 Bd5 16.Rd3 Bc6 17.Rb3 Rc7 18.Rb4 Rf7 19.Rb3 Rc4 20.Rg6
  29	08:53	3.768.718,438	7.072.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc8 14.Re5 Ba6 15.Re6 Rd2+ 16.Ke5 Bc4 17.Ra4+ Kb7 18.Rb4+ Kc8 19.Rg6 Re7+ 20.Kf5
  29	13:53	5.836.916,756	7.004.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Rg6+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc8 14.Re5 Ba6 15.Re6 Rd2+ 16.Ke5 Bc4 17.Ra4+ Kb7 18.Rb4+ Kc8 19.Rg6
  30	16:22	6.905.949,309	7.031.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Ra3 Ba4 9.Rg6+ Kb7 10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rag3 Bd7 13.Rg7 Rd5 14.R3g6 Rb5+ 15.Kc2 Rc5+ 16.Kb3 Rh8 17.Rg4 Rb5+ 18.Kc3 Rd5 19.Rd4 Rh3+ 20.Kc4
  30	19:15	8.141.354,504	7.049.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Ra3 Ba4 9.Rg6+ Kb7 10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rag3 Bd7 13.Rg7 Rd5 14.R3g6 Rb5+ 15.Kc2 Rc5+ 16.Kb3 Rh8 17.Rg4 Rb5+ 18.Kc3 Rd5 19.Rd4 Rh3+ 20.Kc4
  31	21:55	9.322.143,883	7.086.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Ra3 Ba4 9.Rg6+ Kb7 10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rag3 Bd7 13.Rg7 Rd5 14.R3g6 Rf4 15.Ra6 Rf3 16.Kc2 Re3 17.Rag6 Kd8 18.Rh6 Rc5+ 19.Kd2
  31	28:52	11.957.206,296	6.901.000	-0.67	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rbc3+ Kb7 7.Rb3+ Ka6 8.Ra3 Ba4 9.Rg6+ Kb7 10.Rg7+ Kb6 11.Rg6+ Kc7 12.Rag3 Bd7 13.Rg7 Rd5 14.R3g6 Rf4 15.Ra6 Rf3 16.Kc2 Re3 17.Rag6 Kd8 18.Rh6 Rc5+ 19.Kd2
  32	46:28	19.369.120,200	6.947.000	-0.71	1.Rh8+ Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rg6+ Kc7 7.Rc3+ Kb7 8.Rb3+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2 13.Re3 Bc8 14.Re5 Bb7 15.Re6 Rd7+
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Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Can it be Saved?

Post by Terry McCracken »

kingliveson wrote:
peter wrote:
kingliveson wrote: Rg8+ is not the best move as it immediately gives more power to an already empowered Bishop while leaving the white King exposed to the attacking Rooks.
So you're in doubt yourself again?
:)
1.Kb3 you've already tried, 1.Kg8 was Eelco's favorite too, if I remember right, considering 1.Kh8 too?
If somebody can bring any variant leading to remis (besides myself, which was wrong, I guess :)) let's see, if not, it's propably lost, isn't it?
Rh8+ seems to be the better move, but whether it leads to draw, no way to tell.
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1
Here's a short line.

1. Rb6 Rxa5 2. Rb3 Be6 3. Rc3 Rb5+ 4. Ka1 Rxc3 5. Rc7+ ( Kxc7=) Kd8 6. Rxc3= :)
Terry McCracken
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Can it be Saved?

Post by peter »

kingliveson wrote:
Will play out starting from Rh8+ with 90+30 time control.
Do so!
But if I may give advice, don't trust any engine with too much nullmove- pruning here, Terry McCracken was right about zugzwang.
No Rybka, no Robbka will help in such positions. Don't know if Crafty has switched off nullmove pruning with such reduced material, Deep Fritz 10 by default helps or 11 or 12 with nullmove manually switched off but these take some more time then, Zappa is good, especially with nullmove off too, but very slow of course.
Peter.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Can it be Saved?

Post by peter »

Terry McCracken wrote: Here's a short line.
1. Rb6 Rxa5 2. Rb3 Be6 3. Rc3 Rb5+ 4. Ka1 Rxc3 5. Rc7+ ( Kxc7=) Kd8 6. Rxc3= :)
That might work too, the problem is, no engine would play 2... Be6 seeing the following leading to immediat exchange of rooks with at least complete 5 MOB on disk or in main memory.
:)

After I managed one remis against DF10 with help of DF 12
with nullmove off,
http://www.talkchess.com/forum/viewtopi ... 60&t=32823
I went back with Firebird, just because it's fast keeping all the way to 50 moves boundary in hash.
Here is its analyzing output afterwards:

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

Analysis by FireBird 1.1 w32:

1.a6 Tb5+ 2.Ka3 Te4 3.Td6 Le6 4.Tb7
= (-0.18) Tiefe: 6 00:00:00 9kN, tb=49
...
1.a6 Tb5+ 2.Ka3 Te4 3.Tg3 Ta5+ 4.Kb2 Te2+ 5.Kb3 Le6+ 6.Kb4 Txa6 7.Tg7 Tb2+ 8.Kc3 Tb3+ 9.Kd4 Ta4+ 10.Kc5 Tc3+ 11.Kb6
=/+ (-0.49) Tiefe: 10 00:00:00 246kN, tb=3130
1.Kb3 Tf4 2.Th8+ Kc7 3.Th3 Tb5+ 4.Kc3 Tc5+ 5.Kb2 Td5 6.a6 Tf2+ 7.Kc3 Kb6 8.Td3 Tc5+ 9.Kd4 Tf4+ 10.Ke3
=/+ (-0.55) Tiefe: 11 00:00:00 377kN, tb=7004
...
1.Kb3 Tc7 2.Tg8+ Kb7 3.Tb6+ Ka7 4.Tgg6 Txa5 5.Tgd6 Tc1 6.Kb2 Tac5 7.Ka2 Lc6 8.Tb1 T1c2+ 9.Ka3 T2c3+ 10.Kb2
=/+ (-0.64) Tiefe: 14 00:00:01 2264kN, tb=65056
1.Th8+ Kc7 2.Th3 Kc6 3.Tc3 Tb5+ 4.Tb3 Txa5 5.Tgg3 Th4 6.Tg6+ Kc7 7.Tc3+ Kb7 8.Tb3+ Ka7 9.Td6 Th2+ 10.Kc3 Tc5+ 11.Kd4 Tc7 12.Td5 Ka6 13.Te5 Td2+ 14.Ke3 Tg2 15.Kd4 Lc6 16.Ta3+ Kb7 17.Tb3+ Kc8 18.Te6 Td7+ 19.Kc5 Tc2+ 20.Kb4
=/+ (-0.59) Tiefe: 14 00:00:01 3725kN, tb=126364
...
1.Th8+ Kc7 2.Th3 Kc6 3.Tc3 Tb5+ 4.Tb3 Txa5 5.Tgg3 Th4 6.Tg6+ Kc7 7.Tc3+ Kb7 8.Tb3+ Ka7 9.Td6 Th2+ 10.Kc3 Tc5+ 11.Kd4 Tc7 12.Td5 Ta2 13.Ke5 Lc6 14.Tdd3 Te2+ 15.Te3 Td2 16.Ted3 Tf2 17.Tb1 Te7+ 18.Kd4 Ta2 19.Kc4 Tc2+ 20.Tc3
=/+ (-0.67) Tiefe: 27 00:07:11 1366mN, tb=84393658

You see, eval is starting with -0.18!, climbing up to the value of empty hash slowly, the more he "forgets" what he has learned.

You were right about zugzwang, you may have been right about remis.
:)
Peter.
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peter
Posts: 3186
Joined: Sat Feb 16, 2008 7:38 am
Full name: Peter Martan

Re: Can it be Saved?

Post by peter »

Terry McCracken wrote: 1. Rb6 Rxa5 2. Rb3 Be6 3. Rc3 Rb5+ 4. Ka1 Rxc3 5. Rc7+ ( Kxc7=) Kd8 6. Rxc3= :)
And just to show, how not so bad an engine can fail going on with your line, another one not so much longer:

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rb6 Rxa5 2. Rb3 Rac5 3. Re3 Rc2+ 4. Kb3 Rc1 5. Kb2 R5c2+ 6. Kb3 Rc6 7. Kb2
R1c2+ 8. Kb3 R2c5 9. Kb4 Rc1 10. Ka3 Rb1 11. Ka2 Rb5 12. Rg8+ Kc7 13. Rg7 Rd6
14. Rf7 Kb6 15. Ka3 Ka6 16. Rfe7 Rdb6 17. R7e5 Rb4 18. R5e4 Rb1 19. Ka2 Kb7 20.
Rd4 Bf5 21. Rh4 Rf1 0-1


As said above, no engine with tbs would play 2... Be6, Firebird's move is 2... Rac5 instead, only 20 moves later it's already mate in 27, if you may trust Zappa as for this.
This was again Firebird 1.1 with it's own Triplebases 3,4,5 playing black against R3 with white, Fritz endgame- Turbo (complete 5MOB, selected 6s) and option frequent use at 40/40 on quad, 512 Mb hash each.
Last edited by peter on Wed Feb 24, 2010 10:28 pm, edited 2 times in total.
Peter.
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kingliveson

Re: Can it be Saved?

Post by kingliveson »

Preempting Rh8+ from the initial position and playing out rest of the game with 90+30 time control.
[d]2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1
1. Rh8+ Kc7 2. Rh3 Kc6 3. Rc3 Rb5+ 4. Rb3 Rxa5 5. Rg6+ Kc7 6. Rg7 Rd4 7.
Ra3 Rad5 8. Ra6 Rd3 9. Kc2 Kc8 10. Ra5 Rd2+ 11. Kc3 R5d3+ 12. Kb4 Rd4+ 13.
Kc3 R2d3+ 14. Kb2 Kb7 15. Rc5 Rb4+ 16. Kc2 Rd6 17. Kc3 Rf4 18. Rg3 Be6 19.
Rd3 Ra6 20. Kd2 Rf2+ 21. Ke3 Rh2 22. Rdc3 Ra4 23. Rc2 Rh3+ 24. Kf2 Bd5 25.
R5c3 Rhh4 26. Rc7+ Kb6 27. R7c3 Ka6 28. Rc5 Rh2+ 29. Kg3 Rh5 30. R5c3 Rg5+
31. Kf2 Rg6 32. Rc1 Rg2+ 33. Ke3 Rg8 34. Kf2 Rf8+ 35. Kg3 Rh8 36. R1c2 Rh5
37. Kf2 Rh6 38. Rc5 Rh8 39. Kg3 Rg8+ 40. Kf2 Rg2+ 41. Ke3 Rg3+ 42. Kf2 Rh3
43. R5c3 Rh1 44. Kg3 Rg1+ 45. Kf2 Rg5 46. Ke1 Rg1+ 47. Kf2 Rg2+ 48. Ke3
Re4+ 49. Kd3 Rg3+ 50. Kd2 Rd4+ 51. Kc1 Rg1+ 52. Kb2 Kb7 53. Rc5 Bc4 54.
R5xc4 Rxc4 55. Rxc4 Rd1 56. Kc3 Ra1 57. Kd4 Rb1 58. Ke5 Ra1 59. Rf4 Rb1 60.
Kd4 Ra1 61. Ke5 Rb1 62. Kd4 Ra1 63. Ke5 {3-fold repetition} 1/2-1/2

Evals:

Code: Select all

1. Rh8+ Kc7 {(1. ... Kc7 2.Rh3 Kc6 3.Rc3 Rb5+ 4.Rb3 Rxa5 5.Rgg3 Rh4 6.Rg6+
Kc7 7.Rc3+ Kb7 8.Rb3+ Ka7 9.Rgb6 Rh2+ 10.Kc3 Rc5+ 11.Kd4 Rc7 12.R6b4 Ra2
13.Re3 Bc8 14.Rf3 Rd2+ 15.Ke5 Re2+ 16.Kd4 Rd7+ 17.Kc3 Bb7 18.Rf6 Re3+
19.Kc2) +0.68/27 66} 2. Rh3 {(1.Rh3 Kc6 2.Rc3 Rb5+ 3.Rb3 Rxa5 4.Rg6+ Kc7
5.Rc3 Rb5+ 6.Rb3 Rbc5 7.Re3 Bc6 8.Rh3 Rc2+ 9.Ka3 Kb6 10.Rb3+ Ka6 11.Rb4
R2c3+ 12.Rb3 Rxb3+ 13.Kxb3 Kb5 14.Rg4 Bd5+) -0.30/22 134} Kc6 {(1. ... Kc6
2.Rc3 Rb5+ 3.Rb3 Rxa5 4.Rgg3 Rh4 5.Rg6+ Kc7 6.Rc3+ Kb7 7.Rb3+ Ka7 8.Rgb6
Rh2+ 9.Kc3 Rc5+ 10.Kd4 Rc7 11.R6b4 Ra2 12.Rg3 Bf5 13.Rc3 Rd7+ 14.Ke3 Re7+
15.Kf4 Be6 16.Ke5 Bc8+ 17.Kf6 Re6+ 18.Kg7 Rg2+ 19.Kf7 Rf2+ 20.Kg7 Re7+
21.Kh6) +0.69/27 89} 3. Rc3 {(1.Rc3 Rb5+ 2.Rb3 Rxa5 3.Rg6+ Kc7 4.Rg7 Rd4
5.Re3 Rd2+ 6.Kc3 Rd6 7.Kc2 Rb5 8.Rd3 Kc6 9.Rxd6+ Kxd6 10.Kc3 Be6) -0.30/22
118} Rb5+ {(1. ... Rb5+ 2.Rb3 Rxa5 3.Rgg3 Rh4 4.Rg6+ Kc7 5.Rc3+ Kb7 6.Rb3+
Ka7 7.Rgb6 Rh2+ 8.Kc3 Rc5+ 9.Kd4 Rc7 10.R6b4 Ra2 11.Rg3 Bf5 12.Rc3 Rd7+
13.Ke3 Re7+ 14.Kf4 Be6 15.Ke5 Bc8+ 16.Kf6 Re6+ 17.Kg7 Rg2+ 18.Kf7 Rf2+
19.Kg7 Re7+ 20.Kh6) +0.69/25 0} 4. Rb3 {(1.Rb3) -0.30/20} Rxa5 {(1. ...
Rxa5 2.Rgg3 Rh4 3.Rbc3+ Kb7 4.Rb3+ Ka6 5.Ra3 Ba4 6.Rg6+ Kb7 7.Rg7+ Kb6
8.Rg6+ Kc7 9.Rg7+ Kd6 10.Rd3+ Ke6 11.Rg2 Re4 12.Rgg3 Rb5+ 13.Ka3 Rbe5
14.Rg6+ Ke7 15.Rb6 Be8 16.Rh3 Ra5+ 17.Kb2 Ra7 18.Rh7+ Bf7 19.Kc3 Ra3+
20.Kb2) +0.68/27 152} 5. Rg6+ {(1.Rg6+ Kc7 2.Rg7 Rd4 3.Re3 Rd2+ 4.Kc3 Rd6
5.Kc2 Kb6 6.Rb3+ Ka6 7.Kb2 Bc6 8.Kc3 Rh6 9.Rg4 Rh3+ 10.Kb2 Rxb3+) -0.31/23
177} Kc7 {(1. ... Kc7 2.Rgg3 Bc6 3.Rbc3 Rb4+ 4.Kc2 Ra6 5.Kd2 Rd4+ 6.Kc1 Rd6
7.Ra3 Ba4 8.Rgd3 Rh6 9.Rh3 Rhd6) +0.69/25 66} 6. Rg7 {(1.Rg7 Rd4 2.Re3 Rd2+
3.Kc3 Rd6 4.Kc2 Kb6 5.Rb3+ Ka6 6.Kb2 Be6 7.Rb8 Rc5 8.Rg2 Rd3 9.Re2 Bd5
10.Rc2 Rb5+ 11.Rxb5 Kxb5) -0.32/23 143} Rd4 {(1. ... Rd4 2.Re3 Rd2+ 3.Kb3
Rd6 4.Kb2 Rb5+ 5.Kc2 Rbd5 6.Rh7 Rd2+ 7.Kc3 Ra2 8.Rhe7 Kc6 9.R7e5 Ra8
10.R5e4 Bf5 11.Re5 Ra4 12.Kb2 Rf4 13.Rc3+ Kd7 14.Re2 Be6 15.Kc2 Rb4)
+0.82/27 172} 7. Ra3 {(1.Ra3) -0.33/22 910} Rad5 {(1. ... Rad5 2.Ra6 Rd3
3.Kc2 Rf3 4.Rag6 Rf2+ 5.Kb3 Rd3+ 6.Kc4 Ra3 7.Kd5 Rf5+ 8.Ke4 Rh5 9.Rf7 Rhh3
10.Ke5 Ra5+ 11.Kf6 Kd6 12.Kg7+ Be6 13.Rb7 Ke5 14.Re7 Ra6) +0.86/24 40} 8.
Ra6 {(1.Ra6 Rd3 2.Kc2 Rf3 3.Rag6 Ra5 4.Kb2 Raa3 5.Rf6 Rfb3+ 6.Kc2 Rh3 7.Kb2
Rab3+) -0.35/22 144} Rd3 {(1. ... Rd3 2.Kc2 Rf3 3.Rag6 Rc5+ 4.Kd2 Rcc3
5.Ke1 Rb3 6.Rg2 Rb1+ 7.Ke2 Ra3 8.Kd2 Kb6 9.R7g3 Ra2+ 10.Ke3 Ra8 11.Rg6+ Kb5
12.Rd2 Rb3+ 13.Kf4 Bc6 14.Re2 Bd5 15.Rc2 Rb4+) +0.95/25 94} 9. Kc2 {(1.Kc2
Rf3 2.Rag6 Ra5 3.Kb2 Raa3 4.Rf6 Rfb3+ 5.Kc2 Rh3 6.Kb2 Rab3+ 7.Kc2 Rbc3+
8.Kb2) -0.36/22 124} Kc8 {(1. ... Kc8 2.Rf7 Re3 3.Ra7 Kd8 4.Ra8+ Kc7 5.Ra6
Kb8 6.Rb6+ Kc8 7.Ra6 Rd4 8.Kc1 Re2 9.Ra7 Kd8 10.Rb7 Rd5 11.Rf8+ Be8 12.Rb2
Rc5+ 13.Kb1 Re1+ 14.Ka2 Ke7 15.Rf3 Bc6 16.Rd3 Ke6 17.Ka3) +0.95/26 179} 10.
Ra5 {(1.Ra5 R5d4 2.Rc5+ Kd8 3.Kc1 Ba4 4.Rg2 Kd7) -0.35/20 141} Rd2+ {(1.
... Rd2+ 2.Kc3 R5d3+ 3.Kb4 Rd4+ 4.Kc3 R2d3+ 5.Kb2 Kb7 6.Rc5 Rb4+ 7.Kc2 Rd6
8.Rgg5 Rbd4 9.Kc3 Rd3+ 10.Kb4 Rh3 11.Rg7 Ka6 12.Rc4 Rb6+ 13.Kc5 Rh5+ 14.Kd4
Rd6+ 15.Ke3 Kb6 16.Rc2 Rh1 17.Rb2+ Kc5 18.Rgg2 Rh3+ 19.Kf4 Rh4+) +0.96/26
82} 11. Kc3 {(1.Kc3 R5d3+ 2.Kb4 Rd4+ 3.Kc3 R2d3+ 4.Kb2) -0.36/21 48} R5d3+
{(1. ... R5d3+ 2.Kb4 Rd4+ 3.Kc3 R2d3+ 4.Kb2 Kb7 5.Rc5 Rb4+ 6.Kc2 Rd6 7.Rgg5
Rf6 8.Rcd5 Kc6 9.Rc5+ Kb6 10.Rcd5 Bc6 11.Kc3 Ra4 12.Rgf5 Re6 13.Rde5 Rh6
14.Rh5 Rf6 15.Rhf5 Rd6 16.Re7 Bd5 17.Kb2 Rb4+ 18.Kc3 Rb3+ 19.Kd4) +0.97/26
58} 12. Kb4 {(1.Kb4 Rd4+ 2.Kc3 R2d3+ 3.Kb2 Kb7 4.Rc5 Kb6 5.Re5 Bc6 6.Rg6
Rc4 7.Rf6 Rd2+ 8.Kb3 Rc5 9.Rfe6 Rd3+ 10.Kb4 Rd4+ 11.Kb3 Kb5) -0.37/22 102}
Rd4+ {(1. ... Rd4+ 2.Kc3 R2d3+ 3.Kb2 Kb7 4.Rc5 Rb4+ 5.Kc2 Rd6 6.Rgg5 Rf6
7.Rcd5 Kc6 8.Rc5+ Kb6 9.Rcd5 Bc6 10.Kc3 Ra4 11.Rgf5 Re6 12.Rde5 Rh6 13.Rh5
Rf6) +0.97/26 115} 13. Kc3 {(1.Kc3 R2d3+ 2.Kb2 Kb7 3.Rc5 Kb6 4.Rc3 Rd2+
5.Rc2 Rxc2+ 6.Kxc2 Kc5) -0.37/23 98} R2d3+ {(1. ... R2d3+ 2.Kb2 Kb7 3.Rc5
Rb4+ 4.Kc2 Rd6 5.Rgg5 Rf6 6.Rcd5 Kc6 7.Rc5+ Kb6 8.Rcd5 Bc6 9.Kc3 Ra4
10.Rgf5 Re6 11.Rde5 Rh6 12.Rh5) +0.97/25 54} 14. Kb2 {(1.Kb2 Kb7 2.Rc5 Kb6
3.Rc3 Rd2+ 4.Rc2 Rxc2+ 5.Kxc2 Kc5) -0.37/23 89} Kb7 {(1. ... Kb7 2.Rc5 Rb4+
3.Kc2 Rd6 4.Rgg5 Rf6 5.Rcd5 Kc6 6.Rc5+ Kb6 7.Rcd5 Ba4+ 8.Kc3 Rb3+ 9.Kc4 Rb1
10.Kd4 Bc6 11.Rd8 Bb7 12.Rd7 Re6 13.Kc3 Rc6+ 14.Kd2 Rb2+ 15.Ke3 Re6+
16.Kf4) +0.99/25 86} 15. Rc5 {(1.Rc5 Kb6 2.Rc3 Rd2+ 3.Rc2 Rxc2+ 4.Kxc2 Kc5)
-0.37/22 48} Rb4+ {(1. ... Rb4+ 2.Kc2 Rd6 3.Rgg5 Rf6 4.Rcd5 Kc6 5.Kc3 Ra4
6.Kb3 Ra8 7.Ra5 Rb8+ 8.Kc3 Rf3+ 9.Kc2 Rbb3 10.Rae5 Ra3 11.Rg6+ Kc7 12.Kb2
Rab3+ 13.Kc2 Rbc3+ 14.Kd2 Rh3 15.Re4 Bc6 16.Rg7+ Kb6) +0.99/25 36} 16. Kc2
{(1.Kc2 Rd6 2.Kc3 Re4 3.Rgg5 Red4 4.Rc4 Rd3+ 5.Kb2 Rf3 6.Re5 Ka6 7.Rc2 Rdd3
8.Rh2 Kb6 9.Kc1 Rc3+ 10.Rc2) -0.34/21 69} Rd6 {(1. ... Rd6 2.Rgg5 Rf6
3.Rcd5 Kc6 4.Kc3 Ra4 5.Kb3 Ra8 6.Ra5 Rb8+ 7.Kc3 Rf3+ 8.Kc2 Rbb3 9.Rae5 Ra3
10.Rg6+ Kc7 11.Kb2 Rab3+ 12.Kc2 Rbc3+ 13.Kd2 Rh3 14.Re4 Bc6 15.Rg7+ Kb6)
+0.99/23 0} 17. Kc3 {(1.Kc3 Re4 2.Kb2 Kb6 3.Rgg5 Rf4 4.Rge5 Rfd4 5.Rh5 Bc6
6.Rc3) -0.36/22 150} Rf4 {(1. ... Rf4 2.Rgg5 Rf3+ 3.Kb4 Rh3 4.Rg7 Ka6 5.Rc4
Rh5 6.Rc7 Bc6 7.Rc8 Rf6 8.Rg3 Rf4+ 9.Kc3 Rc5+ 10.Kd2 Rd4+ 11.Ke3 Rd7 12.Rg6
Kb5 13.Kf4 Rc4+ 14.Kg5 Rd5+ 15.Kh6 Rh4+) +1.02/25 149} 18. Rg3 {(1.Rg3 Be6
2.Rd3 Ra6 3.Kd2 Ra2+ 4.Ke3 Rh4 5.Rdc3 Bd5 6.Rc2 Ra3+ 7.Kd2 Rh2+ 8.Kc1 Rh5
9.R5c3 Ra1+ 10.Kd2 Rhh1 11.Rb2+ Ka6 12.Rbc2 Ra4 13.Rc5) -0.35/21 112} Be6
{(1. ... Be6 2.Rd3 Ra6 3.Kd2 Rh4 4.Rdc3 Rd6+ 5.Kc1 Kb6 6.Rg5 Ra4 7.Rcc5
Ra1+ 8.Kb2 Ra2+ 9.Kc3 Rdd2 10.Rb5+ Kc6 11.Rgc5+ Kd6 12.Rg5 Rdc2+ 13.Kd4
Rc4+ 14.Ke3 Ra3+ 15.Kd2 Kc6 16.Ra5) +1.03/26 219} 19. Rd3 {(1.Rd3 Ra6 2.Kd2
Rh4 3.Rdc3 Rd6+ 4.Ke3 Kb6 5.Rc7 Bd5 6.Rc8 Rd7 7.Ke2 Rg7 8.Ke3 Rg3+)
-0.36/23 147} Ra6 {(1. ... Ra6 2.Kd2 Rh4 3.Rdc3 Rd6+ 4.Kc1 Kb6 5.Rg5 Ra4
6.Rc2 Ra1+ 7.Kb2 Rdd1 8.Rcg2 Ra4 9.Rg6 Rd6 10.R6g5 Ra2+ 11.Kc1 Ra1+ 12.Kb2
Ra4 13.Kc1 Rd3 14.Rg6 Re3 15.Rf6 Rc3+ 16.Kd2) +1.03/25 37} 20. Kd2 {(1.Kd2
Ra2+ 2.Ke3 Raa4) -0.37/22 147} Rf2+ {(1. ... Rf2+ 2.Ke3 Rh2 3.Rdc3 Ra4
4.Rc7+ Ka8 5.Rc2 Rh3+ 6.Kf2 Bd5 7.R7c3 Rh5 8.Ke1 Ka7 9.Re3 Rh1+ 10.Kd2 Kb6
11.Rec3 Rh2+ 12.Ke3 Rhh4 13.Rc8 Ka6 14.Kf2 Rh3 15.R8c3 Rh2+ 16.Ke3 Rh6
17.Kf2 Rh1 18.Kg3 Rg1+ 19.Kf2) +1.04/25 206} 21. Ke3 {(1.Ke3 Rh2 2.Rdc3 Ra4
3.Rc7+ Ka8 4.R7c5 Bd5 5.Kd3 Rh5 6.Kd2 Kb7 7.Rc2 Kb6 8.R5c3 Rd4+) -0.36/23
70} Rh2 {(1. ... Rh2 2.Rdc3 Ra4 3.Rc7+ Ka8 4.Rc2 Rh3+ 5.Kf2 Bd5 6.R7c3 Rhh4
7.Kg3 Rhg4+ 8.Kf2 Ka7 9.Ke1 Rg1+ 10.Kd2 Rh1 11.Rc7+ Kb6 12.R7c3 Rh2+ 13.Ke3
Rhh4 14.Rc8 Ka6 15.Kf2 Rh3 16.R8c3 Rh2+ 17.Ke3 Rh6 18.Kf2 Rh1 19.Kg3 Rhh4
20.Rc7 Rag4+ 21.Kf2 Rg2+ 22.Ke3 Rg3+) +1.04/26 38} 22. Rdc3 {(1.Rdc3 Ra4
2.Rc7+ Ka8 3.R7c5 Bd5 4.Kd3 Rh5 5.Kd2 Ka7 6.Rc2 Rd4+ 7.Ke3 Rhh4 8.Rc7+ Kb6)
-0.37/24 94} Ra4 {(1. ... Ra4 2.Rc7+ Ka8 3.R7c5 Bd5 4.Kd3 Rh5 5.Kd2 Kb7
6.Rc2 Ka6 7.Kc1 Rh1+ 8.Kd2 Rh2+ 9.Kc1 Rh5 10.Kd2 Kb6 11.Rc8 Rh2+ 12.Kc3
Rhh4 13.Kd2 Rh3 14.R8c3 Rh2+ 15.Ke3 Rhh4 16.Rc8 Ka6 17.Kf2 Rh3 18.R8c3 Rh2+
19.Ke3 Rh6 20.Kf2 Rh1 21.Kg3 Rhh4 22.Rc7 Rag4+ 23.Kf2 Rg2+ 24.Ke3 Rg3+)
+1.04/26 46} 23. Rc2 {(1.Rc2 Rh3+ 2.Kf2 Bd5 3.R5c3 Rh7 4.Kg3 Rg7+ 5.Kf2 Ka6
6.Rc5) -0.37/24 275} Rh3+ {(1. ... Rh3+ 2.Kf2 Bd5 3.R5c3 Rhh4 4.Rc7+ Kb6
5.Rc8 Ka7 6.R8c3 Ka6 7.Rc8 Raf4+ 8.Ke2 Rfg4 9.Ke1 Rh1+ 10.Kd2 Rd4+ 11.Ke3
Ra4 12.Kd2 Rh3 13.R8c3 Rh2+ 14.Ke3 Rh5 15.Kf2 Rhh4) +1.04/25 40} 24. Kf2
{(1.Kf2 Bd5 2.R5c3 Rh7 3.Kg3 Rg7+ 4.Kf2 Ka6 5.Rc5) -0.37/23 43} Bd5 {(1.
... Bd5 2.R5c3 Rhh4 3.Rc7+ Kb6 4.Rc8 Ka7 5.R8c3 Ka6 6.Rc8 Raf4+ 7.Ke2 Rfg4
8.Ke1 Rh1+ 9.Kd2 Rd4+ 10.Ke3 Ra4 11.Kd2 Rh2+ 12.Kc1 Rh5 13.R8c5 Rh1+ 14.Kd2
Rh2+ 15.Kc1 Rh5 16.Kd2 Kb6 17.Rc8 Rh2+ 18.Ke3 Rh3+ 19.Kf2) +1.04/25 53} 25.
R5c3 {(1.R5c3 Rhh4 2.Rc7+ Kb6 3.R7c3 Raf4+ 4.Ke2 Bc4+ 5.Ke3 Rfg4 6.Kf3 Kb5
7.Rb2+ Kc5 8.Rg2 Rd4 9.Rg6 Kb4 10.Rc1 Bd5+ 11.Kg3 Rhf4) -0.38/22 81} Rhh4
{(1. ... Rhh4 2.Rc7+ Kb6 3.Rc8 Ka7 4.R8c3 Ka6 5.Rc8 Rh2+ 6.Kg3 Rh5 7.R8c3
Rg5+ 8.Kf2 Rg6 9.Rc5 Rg2+ 10.Ke3 Rg3+ 11.Kf2 Rh3 12.R5c3 Rh6 13.Rc5 Rh5
14.R5c3 Rh2+ 15.Kg3 Rh5 16.Kf2) +1.04/24 39} 26. Rc7+ {(1.Rc7+ Kb6 2.R7c3
Raf4+ 3.Ke3 Rf3+ 4.Kd2 Rh2+ 5.Kc1 Rxc3 6.Rxc3 Be4 7.Rc4 Bh7 8.Kd1 Bg8 9.Rc8
Bf7 10.Ke1 Bd5) -0.39/22 110} Kb6 {(1. ... Kb6 2.Rc8 Ka7 3.R8c3 Ka6 4.Rc8
Rh2+ 5.Kg3 Rh5 6.R8c3 Rg5+ 7.Kf2 Rg6 8.Rc5 Rg2+ 9.Ke3 Rg3+ 10.Kf2 Rh3
11.R5c3 Rh6 12.Rc5 Rh1 13.R5c3 Rh2+ 14.Kg3 Rh5 15.Kf2 Rh2+) +1.04/24 31}
27. R7c3 {(1.R7c3 Raf4+ 2.Ke3 Rf3+ 3.Kd2 Rh2+ 4.Kc1 Rxc3 5.Rxc3 Be4 6.Rc4
Bh7 7.Kd1 Bg8 8.Rc8 Bf7 9.Ke1 Bd5 10.Rc3 Kb5) -0.39/23 160} Ka6 {(1. ...
Ka6 2.Rc8 Rh2+ 3.Kg3 Rh5 4.R8c3 Rg5+ 5.Kf2 Rg6 6.Rc5 Rg2+ 7.Ke3 Rg3+ 8.Kf2
Rh3 9.R5c3 Rh6 10.Rc5 Rh1 11.R5c3 Rh2+ 12.Kg3 Rh5 13.Kf2 Rh2+) +1.04/23 39}
28. Rc5 {(1.Rc5) -0.39/19 72} Rh2+ {(1. ... Rh2+ 2.Kg3 Rh5 3.Kf2 Rg4 4.Ke1
Re4+ 5.Kd1 Rd4+ 6.Ke1 Rh1+ 7.Kf2 Ra4 8.R5c3 Rb4 9.Ke3 Kb6 10.Rc8 Re4+
11.Kd3 Rh3+ 12.Kd2 Rd4+ 13.Kc1 Ra4 14.R8c3 Rh1+ 15.Kd2 Rh2+ 16.Ke3 Rhh4
17.Rc8 Ka6 18.Kf2 Rh2+ 19.Kg3 Rh5 20.R8c3 Rg5+ 21.Kf2 Rg6 22.Rc5 Rg2+
23.Ke3 Rg3+ 24.Kf2 Rh3 25.R5c3 Rh6 26.Rc5 Rh1) +1.04/26 150} 29. Kg3
{(1.Kg3 Rh5 2.R5c3 Rg5+ 3.Kf2 Rh4 4.Ke3 Kb5 5.Rc8 Ka4 6.Kd2 Rgg4 7.Ke1 Rg3)
-0.39/21 41} Rh5 {(1. ... Rh5 2.Kf2 Rg4 3.Ke1 Re4+ 4.Kd1 Rd4+ 5.Ke1 Rh1+
6.Kf2 Ra4 7.R5c3 Rb4 8.Ke3 Kb6 9.Rc8 Re4+ 10.Kd3 Rh3+ 11.Kd2 Rd4+ 12.Kc1
Ra4 13.R8c3 Rh1+ 14.Kd2 Rh2+ 15.Ke3 Rhh4 16.Rc8 Ka6 17.Kf2 Rh2+ 18.Kg3 Rh5
19.R8c3 Rg5+ 20.Kf2 Rg6 21.Rc5 Rg2+ 22.Ke3 Rg3+ 23.Kf2 Rh3 24.R5c3 Rh6
25.Rc5 Rh1) +1.04/24 0} 30. R5c3 {(1.R5c3 Rg5+ 2.Kf2 Re4 3.Re2 Rh4 4.Rec2
Kb5) -0.40/21 100} Rg5+ {(1. ... Rg5+ 2.Kf2 Rg6 3.Rc5 Rg2+ 4.Ke3 Rg3+ 5.Kf2
Rh3 6.R5c3 Rh6 7.Rc5 Rh1 8.R5c3 Rb4 9.Ke3 Kb6 10.Rc8 Re4+ 11.Kd3 Rh3+
12.Kd2 Rd4+ 13.Kc1 Ra4 14.R8c3 Rh1+ 15.Kd2 Rh2+ 16.Ke3 Rhh4 17.Rc8 Ka6
18.Kf2 Rh2+ 19.Kg3 Rh5 20.R8c3) +1.04/25 32} 31. Kf2 {(1.Kf2 Re4 2.Re2 Rh4
3.Rec2 Kb5 4.Rc8 Rh3 5.Ke1 Kb4) -0.40/22 72} Rg6 {(1. ... Rg6 2.Ke1 Rg1+
3.Kd2 Rh1 4.Re3 Kb6 5.Re2 Rh3 6.Re5 Rh2+ 7.Re2 Rh1 8.Rb2+ Kc5 9.Rf2 Rh3
10.Rc2+ Kd4 11.Rc1 Ra2+ 12.Rc2 Ra1 13.Rb2 Rd3+ 14.Kc2 Rc3+ 15.Kd2 Rh3
16.Re2 Rh6 17.Re8 Ra3 18.Re2 Ra1) +0.96/24 194} 32. Rc1 {(1.Rc1 Rg2+ 2.Ke3
Rh2 3.R1c2 Rhh4) -0.39/21 107} Rg2+ {(1. ... Rg2+ 2.Ke3 Rg8 3.Kd2 Rh8 4.Ke1
Rh2 5.R3c2 Rh3 6.Rc3 Rh1+ 7.Kf2 Rh2+ 8.Ke3 Rh3+ 9.Kd2 Rd4+ 10.Ke2 Rh2+
11.Ke3 Re4+ 12.Kf3 Rh3+ 13.Kf2 Rf4+ 14.Ke1 Rh1+ 15.Kd2 Rh2+ 16.Ke3 Ra4
17.R1c2 Rh3+ 18.Kf2 Rh6 19.Rc5 Rh1 20.R5c3 Rh8 21.Rc5 Rh7 22.R5c3 Rh2+
23.Kg3 Rh5 24.Kf2) +1.04/25 144} 33. Ke3 {(1.Ke3 Rh2 2.R1c2 Rh5 3.Kf2 Rg4
4.Ke1 Ka5 5.Rc8 Rh1+ 6.Kd2 Be4 7.R2c5+ Kb6 8.Rc4 Rg2+ 9.Ke3 Re1+) -0.40/22
41} Rg8 {(1. ... Rg8 2.Kd2 Rh8 3.Ke1 Rh2 4.R3c2 Rh3 5.Rc3 Rh1+ 6.Kf2 Rh2+
7.Ke3 Rh3+ 8.Kd2 Rd4+ 9.Ke2 Rh2+ 10.Ke3 Re4+ 11.Kf3 Rh3+ 12.Kf2 Rf4+ 13.Ke1
Rh1+ 14.Kd2 Rh2+ 15.Ke3 Ra4 16.R1c2 Rh3+ 17.Kf2 Rh6 18.Rc5 Rh1 19.R5c3 Rh8
20.Rc5 Rh7 21.R5c3 Rh2+ 22.Kg3 Rh5 23.Kf2) +1.04/26 29} 34. Kf2 {(1.Kf2
Rf8+ 2.Kg3 Rd4 3.Ra1+ Kb5 4.Rb1+ Ka4 5.Rc7 Rf3+ 6.Kh2 Rd2+ 7.Kg1 Rb3 8.Rxb3
Kxb3 9.Kf1 Kb4 10.Ke1 Rg2) -0.45/21 91} Rf8+ {(1. ... Rf8+ 2.Kg3 Rh8 3.R1c2
Rh5 4.Kf2 Rh6 5.Rc5 Rh1 6.R5c3 Rh8 7.Rc5 Rh7 8.R5c3 Rh2+ 9.Kg3 Rh5)
+1.04/26 99} 35. Kg3 {(1.Kg3 Rd4 2.Ra1+ Kb5 3.Rb1+ Ka4 4.Rc7 Rf3+ 5.Kh2
Rd2+ 6.Kg1 Rb3 7.Rxb3 Kxb3 8.Kf1 Kb4 9.Ke1 Rg2 10.Kf1 Rb2 11.Rc8 Bb7 12.Rc7
Bg2+ 13.Ke1) -0.45/21 45} Rh8 {(1. ... Rh8 2.R1c2 Rh5 3.Kf2 Rh6 4.Rc5 Rh1
5.R5c3 Rh8 6.Rc5 Rh7 7.R5c3 Rh2+ 8.Kg3 Rh5) +1.04/26 73} 36. R1c2 {(1.R1c2
Rg8+ 2.Kf2 Re4) -0.43/21 102} Rh5 {(1. ... Rh5 2.Kf2 Rh6 3.Kg3 Rg6+ 4.Kf2
Rg7 5.Ke1 Rg1+ 6.Kd2 Rh1 7.Re3 Kb6 8.Re2 Rh3 9.Re5 Rh2+ 10.Re2 Rh1 11.Rb2+
Kc5 12.Rf2 Rh3 13.Rc2+ Kb5 14.Ke2 Raa3 15.Kd2 Ra1 16.Rb2+ Kc5 17.Re2 Kd4
18.Rf2 Ra4 19.Rc2 Ra1 20.Rb2) +0.96/26 135} 37. Kf2 {(1.Kf2 Rg4 2.Ke1 Kb5
3.Rc8 Ka4 4.R8c3 Kb4) -0.41/21 127} Rh6 {(1. ... Rh6 2.Kg3 Rg6+ 3.Kf2 Rg7
4.Ke1 Rg1+ 5.Kd2 Rh1 6.Re3 Kb6 7.Re2 Rh3 8.Re5 Rh2+ 9.Re2 Rh1 10.Rb2+ Kc5
11.Rf2 Rh3 12.Rc2+ Kb5 13.Ke2 Raa3 14.Kd2 Ra1 15.Rb2+ Kc5 16.Re2 Kd4 17.Rf2
Ra4 18.Rc2 Ra1 19.Rb2) +0.96/26 203} 38. Rc5 {(1.Rc5 Kb6 2.R5c3 Rb4 3.Kg3
Rh5 4.Kf2 Rhh4) -0.39/20 81} Rh8 {(1. ... Rh8 2.R5c3 Rh1 3.Kg3 Rg1+ 4.Kf2
Rg7 5.Ke1 Rg1+ 6.Kd2 Rh1 7.Re3 Kb6 8.Re2 Rh3 9.Re5 Rh2+ 10.Re2 Rh1 11.Rb2+
Kc5 12.Rf2 Rh3 13.Rc2+ Kb5 14.Ke2 Raa3 15.Kd2 Ra1 16.Rb2+ Kc5 17.Re2 Kd4
18.Rf2) +0.96/26 81} 39. Kg3 {(1.Kg3 Rg8+ 2.Kf2 Rg2+ 3.Ke3 Rg3+ 4.Kf2 Rf3+
5.Ke2 Rh3 6.R5c3 Rh2+ 7.Ke3 Rh5 8.Kf2) -0.40/20 61} Rg8+ {(1. ... Rg8+
2.Kf2 Rg2+ 3.Ke3 Rg3+ 4.Kf2 Rh3 5.R5c3 Rh1 6.Kg3 Rg1+ 7.Kf2 Rg7 8.Ke1 Rg1+
9.Kd2 Rh1 10.Re3 Kb6 11.Re2 Rh3 12.Re5 Rh2+ 13.Re2 Rh1 14.Rb2+ Kc5 15.Rf2
Rh3 16.Rc2+ Kb5 17.Ke2) +0.96/26 137} 40. Kf2 {(1.Kf2 Rg2+ 2.Ke3 Rg3+ 3.Kf2
Rf3+ 4.Ke2 Rh3 5.R5c3 Rh2+ 6.Ke3 Rh5 7.Kf2) -0.40/21 51} Rg2+ {(1. ...
Rg2+) +0.68/26 772} 41. Ke3 {(1.Ke3 Rg3+ 2.Kf2 Rf3+ 3.Ke2 Rh3 4.R5c3 Rh2+
5.Ke3 Rh5 6.Kf2) -0.40/22 41} Rg3+ {(1. ... Rg3+) +0.50/26 587} 42. Kf2
{(1.Kf2 Rf3+ 2.Ke2 Rh3 3.R5c3 Rh2+ 4.Ke3 Rh5 5.Kf2) -0.40/23 52} Rh3 {(1.
... Rh3) +0.96/24 15} 43. R5c3 {(1.R5c3) -0.40/21 64} Rh1 {(1. ... Rh1
2.Rc7 Rf4+ 3.Ke3 Ra4 4.Kf2) +0.50/24 451} 44. Kg3 {(1.Kg3 Rg1+ 2.Kf2 Rg5
3.Ke2 Rg8 4.Rc5 Rh8 5.Kf2) -0.39/20 88} Rg1+ {(1. ... Rg1+) +0.50/23 346}
45. Kf2 {(1.Kf2 Rg5 2.Ke1 Be4 3.Re2 Kb5 4.Rb2+ Rb4 5.Rxb4+ Kxb4 6.Re3 Rg4
7.Kf2 Rg2+ 8.Ke1 Bc6 9.Re2 Rg3 10.Kd2 Bb5 11.Re4+ Bc4) -0.38/21 228} Rg5
{(1. ... Rg5 2.Ke1 Ra1+ 3.Rc1 Ra2 4.R3c2 Ra3 5.Re2 Rg6 6.Kf1 Bb7 7.Ke1 Rf6
8.Rcc2 Ra1+ 9.Kd2 Bf3 10.Re5 Rb6 11.Re7) +0.23/19 60} 46. Ke1 {(1.Ke1 Be4
2.Re2 Kb5 3.Rb2+ Rb4 4.Rxb4+ Kxb4 5.Re3 Rg4 6.Kf2 Rg2+ 7.Ke1 Bc6 8.Re2 Rg3
9.Kd2 Bb5 10.Re4+ Bc4 11.Rh4 Kc5) -0.38/20 87} Rg1+ {(1. ... Rg1+ 2.Kd2
Rgg4 3.Re3 Rgd4+ 4.Kc1 Rh4 5.Re5 Rh1+ 6.Kd2 Rh2+ 7.Re2 Rh6 8.Rb2 Rd6 9.Re5
Rd4+ 10.Ke3) 0.00/21 259} 47. Kf2 {(1.Kf2 Rg5) 0.00/32 33} Rg2+ {(1. ...
Rg2+ 2.Ke3 Rg3+ 3.Kd2 Rd4+ 4.Ke1 Rg7 5.Ra3+ Kb7 6.Rb2+ Kc6 7.Ra6+ Kd7
8.Ra7+ Kc6 9.Rxg7 Rd3 10.Ke2 Rh3 11.Rc2+ Kb5 12.Rc1 Bc4+ 13.Kf2) 0.00/19
54} 48. Ke3 {(1.Ke3 Rxc2 2.Rxc2 Kb5 3.Rc3 Re4+ 4.Kd3 Rg4 5.Ke3 Bc4 6.Rc2
Rh4) -0.28/19 95} Re4+ {(1. ... Re4+ 2.Kd3 Rg3+ 3.Kd2 Rd4+ 4.Ke1 Rg7 5.Ra3+
Kb7 6.Rb2+ Kc6 7.Ra6+ Kd7 8.Ra7+) 0.00/23 36} 49. Kd3 {(1.Kd3 Rg3+ 2.Kd2
Rd4+) -0.28/21 30} Rg3+ {(1. ... Rg3+ 2.Kd2 Rd4+ 3.Ke1 Rg7 4.Ra3+ Kb7
5.Rb2+ Kc6 6.Ra6+ Kd7 7.Ra7+) 0.00/28 16} 50. Kd2 {(1.Kd2 Rd4+) -0.28/20 0}
Rd4+ {(1. ... Rd4+ 2.Ke1 Rg7 3.Ra3+ Kb7 4.Rb2+ Kc6 5.Ra6+ Kd7 6.Ra7+)
0.00/30 17} 51. Kc1 {(1.Kc1 Rxc3) 0.00/20 83} Rg1+ {(1. ... Rg1+ 2.Kb2 Kb7
3.Rc7+ Kb6 4.Kc3 Rg2) 0.00/29 16} 52. Kb2 {(1.Kb2) 0.00/18 0} Kb7 {(1. ...
Kb7 2.Rc7+ Kb6 3.Kc3 Rg2) 0.00/31 22} 53. Rc5 {(1.Rc5 Kb6 2.Rc7 Rg2)
0.00/25 36} Bc4 {(1. ... Bc4 2.R5xc4 Rxc4 3.Rxc4 Rg2+ 4.Rc2 Rxc2+ 5.Kxc2
Kc6 6.Kb3 Kb7 7.Kb2 Kb6 8.Kc3 Kc7 9.Kb2 Kc6 10.Kc2 Kb6 11.Kb3 Kc6 12.Ka2
Kb6 13.Kb2 Kc6) 0.00/33 37} 54. R5xc4 {(1.R5xc4 Rxc4 2.Rxc4 Rg3 3.Rc3 Rg4
4.Kb3 Kb6 5.Rc4 Rg1 6.Kc3) 0.00/27 31} Rxc4 {(1. ... Rxc4 2.Rxc4 Rg2+ 3.Rc2
Rxc2+ 4.Kxc2 Kc6 5.Kb3 Kb7 6.Kb2 Kb6 7.Kc3 Kc7 8.Kb2 Kc6 9.Kc2 Kb6 10.Kb3
Kc6 11.Ka2 Kb6 12.Kb2 Kc6) 0.00/35 13} 55. Rxc4 {(1.Rxc4 Rg3 2.Rc3 Rg4
3.Kb3 Kb6 4.Rc4 Rg1 5.Kc3) 0.00/59 0} Rd1 56. Kc3 {(1.Kc3) 0.00/59 0} Ra1
57. Kd4 {(1.Kd4 Kb6 2.Rc8 Rd1+ 3.Ke5 Re1+ 4.Kd5 Rd1+ 5.Ke4 Re1+) 0.00/59 0}
Rb1 58. Ke5 {(1.Ke5) 0.00/59 0} Ra1 59. Rf4 {(1.Rf4 Kc6) 0.00/59 0} Rb1 60.
Kd4 {(1.Kd4 Rb4+) 0.00/59 0} Ra1 61. Ke5 {(1.Ke5 Kc6) 0.00/59 0} Rb1 62.
Kd4 {(1.Kd4 Rb4+) 0.00/59 0} Ra1 63. Ke5 {(1.Ke5 Kc6) 0.00/59 0 3-fold
repetition} 1/2-1/2
Top
Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Can it be Saved?

Post by Terry McCracken »

That line I gave wasn't meant to be the best...I threw it out tongue in cheek....it's hard to hold the position if you can't exchange a pair of Rooks.

I see no way to force an exchange so it's hard to force a draw. I'd likely lose White's side even if best moves draw. It isn't easy for a rusty older player like myself.

peter wrote:
Terry McCracken wrote: 1. Rb6 Rxa5 2. Rb3 Be6 3. Rc3 Rb5+ 4. Ka1 Rxc3 5. Rc7+ ( Kxc7=) Kd8 6. Rxc3= :)
And just to show, how not so bad an engine can fail going on with your line, another one not so much longer:

2k5/3b2R1/7R/P3r3/2r5/8/1K6/8 w - - 0 1

1. Rb6 Rxa5 2. Rb3 Rac5 3. Re3 Rc2+ 4. Kb3 Rc1 5. Kb2 R5c2+ 6. Kb3 Rc6 7. Kb2
R1c2+ 8. Kb3 R2c5 9. Kb4 Rc1 10. Ka3 Rb1 11. Ka2 Rb5 12. Rg8+ Kc7 13. Rg7 Rd6
14. Rf7 Kb6 15. Ka3 Ka6 16. Rfe7 Rdb6 17. R7e5 Rb4 18. R5e4 Rb1 19. Ka2 Kb7 20.
Rd4 Bf5 21. Rh4 Rf1 0-1


As said above, no engine with tbs would play 2... Be6, Firebird's move is 2... Rac5 instead, only 20 moves later it's already mate in 27, if you may trust Zappa as for this.
This was again Firebird 1.1 with it's own Triplebases 3,4,5 playing black against R3 with white, Fritz endgame- Turbo (complete 5MOB, selected 6s) and option frequent use at 40/40 on quad, 512 Mb hash each.
Terry McCracken
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