Author: Paul
Date: 04:20:27 03/28/01
Go up one level in this thread
On March 27, 2001 at 03:50:39, Paul wrote:
>On March 26, 2001 at 22:01:17, Heiner Marxen wrote:
>
>>On March 26, 2001 at 19:11:34, Paul wrote:
>>
>>>1. c8N!! Rh8 2. Ne7 Nf2 3. Kxf2 Rg8 4. Ke3 Kh8 5. Kd4 Kh7 6. Kc5 Kh8 7. Kb6 Kh7
>>>8. Kc7 Kh8 9. Kc8 Nh7+ 10. Nxg8 Kxg8 11. Kxd7 Kf8 12. Kc8 Nxg5 13. d7 Nf7 14.
>>>d8=Q+ Nxd8 15. Kxd8 Kf7 16. Kd7 Kf8 17. Kxe6 Ke8 18. g5 Kf8 19. Kd7 Kf7 20. e6+
>>>Kg8 21. e7 Kh8 22. e8=N Kh7 23. Nxg7 Kxg7 24. Ke7 Kg8 25. Kf6 Kh7 26. Kf7 Kh8
>>>27. Kxg6 Kg8 28. Kh6 Kf7 29. Kh7 Ke7 30. g6 Ke6 31. g7 Ke5 32. g8=Q Kd4 33. Qg4+
>>>Kd3 34. Kg6 Ke3 35. Kg5 Kd3 36. Qb4 Ke3 37. Kg4 Ke2 38. Qd4 Kf1 39. Qd2 Kg1 40.
>>>Kg3 Kh1 41. Qg2#
>>
>>After 15...Kf7 Crafty 17.7 with 3&4 piece tables finds a mate in 17:
><Partial log snips>
>> 21 0.92 Mat17 1. g5 Kf8 2. Kd7 Kf7 3. Kd6 Ke8 4.
>> Kxe6 Kd8 5. Kf7 <HT>
>>which results in #32, much shorter than yours.
>
>You're absolutely correct! I've just rerun Pretz and it says the same, don't
>know what happened ... except that I have a cold and really shouldn't post in
>this condition. ;) And it's a pity coz there was a nice minor promo at move 22
>in my line above, forgot to mention that before! This I get now:
>
>16. g5 Kf8 17. Kd7 Kf7 18. Kd6 Ke8 19. Kxe6 Kd8 20. Kf7 Kd7 21. e6+ Kd6 22. e7
>Kd5 23. e8=Q Kd4 24. Kxg7 Kd3 25. Kxg6 Kd4 26. Qa4+ Kd3 27. Kf5 Ke3 28. Qd1 Kf2
>29. Kf4 Kg2 30. Qe1 Kh2 31. Kf3 Kh3 32. Qh1#
Ok ... analysed some more yesterday, and the explanation for the longer mates
was simple: different tablebases. The night before, I analysed the positions
for- & backwards using the 5 men tables, while after seeing your message I only
used the 4 men ones. And besides the longer mates, calculating was way slower,
so using the 4 men tb's was an improvement in these positions.
The longest mate I saw while using the 4men ones is a mate in 39, but I haven't
gone all the way back to the root, I stopped after analysing black's 10th move
... so this isn't definite in any way. These are only some of the variations I
found:
1. c8=N Rh8 2. Ne7 Nf2 3. Kxf2 Rg8 4. Ke3 Kh8 5. Kd4 Kh7 6. Kc5 Kh8 7. Kb6 Kh7
8. Kc7 Kh8 9. Kd8 Nh7+ 10. Nxg8 Kxg8 {Nxg5 11. Ne7 Nf7+ 12. Kxd7 Nxe5+ 13. Kxe6
Nd3 14. Nxg6+ Kg8 15. g5 Kh7 16. Kf7 Nc5 17. Nf8+ Kh8 18. d7 Nb7 19. Ne6 Nd6+
20. Kg6 Nb7 21. d8=Q+ Nxd8 22. Nxd8 Kg8 23. Ne6 Kh8 24. Nxg7 Kg8 25. Ne6 Kh8 26.
Kf7 Kh7 27. Ng7 Kh8 28. Nf5 Kh7 29. g6+ Kh8 30. g7+ Kh7 31. g8=Q#} 11. Kxd7 Kf8
{Ng5 12. Ke7 Nf7 13. d7 Nxe5 14. d8=Q+ Kh7 15. Kf8 g5 16. Qxg5 Ng6+ 17. Kf7 Nh8+
18. Kxe6 g6 19. Qh4+ Kg7 20. Qxh8+ Kxh8 21. g5 Kg7 22. Ke7 Kg8 23. Kf6 Kh7 24.
Kf7 Kh8 25. Kxg6 Kg8 26. Kh6 Kf7 27. Kh7 Ke7 28. g6 Ke6 29. g7 Ke5 30. g8=Q Kd4
31. Qg4+ Kd3 32. Kg6 Ke3 33. Kg5 Kd3 34. Qb4 Ke3 35. Kg4 Ke2 36. Qd4 Kf1 37. Qd2
Kg1 38. Kg3 Kh1 39. Qg2#} {Kf7 12. Kc7 Nxg5 13. d7 Nf3 14. d8=Q Nxe5 15. g5 Nf3
16. Qd7+ Kf8 17. Qxe6 Ne5 18. Qxe5 Kf7 19. Kd7 Kg8 20. Qxg7+ Kxg7 21. Ke7 Kg8
22. Kf6 Kh7 23. Kf7 Kh8 24. Kxg6 Kg8 25. Kh6 Kf7 26. Kh7 Ke7 27. g6 Ke6 28. g7
Ke5 29. g8=Q Kd4 30. Qg4+ Kd3 31. Kg6 Ke3 32. Kg5 Kd3 33. Qb4 Ke3 34. Kg4 Ke2
35. Qd4 Kf1 36. Qd2 Kg1 37. Kg3 Kh1 38. Qg2#} 12. Kc8 Nxg5 13. d7 Nf7 14. d8=Q+
Nxd8 15. Kxd8 g5 16. Kd7 Kf7 17. Kd6 Kf8 18. Kxe6 Ke8 19. Kf5 Kf7 20. Kxg5 Ke6
21. Kf4 Kf7 22. Kf5 Ke7 23. e6 Kd6 24. Kg6 Kd5 25. Kxg7 Kxe6 26. g5 Ke7 27. Kh7
Kf7 28. g6+ Kf6 29. g7 Ke5 30. g8=Q Kd4 31. Qg4+ Kd3 32. Kg6 Ke3 33. Kg5 Kd3 34.
Qb4 Ke3 35. Kg4 Ke2 36. Qd4 Kf1 37. Qd2 Kg1 38. Kg3 Kh1 39. Qg2#
The move 9. Kd8 was an improvement over my earlier Kc8 in some of the variations
(to counter a possible black Nf8 with Ke8).
Groetjes,
Paul
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.