2 testpositions from Chessbase. White to play and win!

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

Moderators: hgm, Rebel, chrisw

User avatar
George Tsavdaris
Posts: 1627
Joined: Thu Mar 09, 2006 12:35 pm

2 testpositions from Chessbase. White to play and win!

Post by George Tsavdaris »

From here:
http://www.chessbase.com/newsdetail.asp?newsid=8837

White to play and win? How? :D
[D]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1

The same here.
[D]2n3k1/p5p1/3p1pPP/1PpP1p2/2p2P2/1bP5/2R1P2r/R4K2 w - - 0 1
After his son's birth they've asked him:
"Is it a boy or girl?"
YES! He replied.....
Top
ZirconiumX
Posts: 1334
Joined: Sun Jul 17, 2011 11:14 am

Re: 2 testpositions from Chessbase. White to play and win!

Post by ZirconiumX »

George Tsavdaris wrote:From here:
http://www.chessbase.com/newsdetail.asp?newsid=8837

White to play and win? How? :D
[D]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1
Is this even solvable? Stockfish 130211 64bit - 8 threads - 2GB Hash:

Code: Select all

43    0.00    2377.9M    4:50.19 Qf4 exf4 Bc3+ Qg7 Ne8 Rb1+ Kh2 Rb2+ Kg1 Rb1+ Kh2
The same here.
[D]2n3k1/p5p1/3p1pPP/1PpP1p2/2p2P2/1bP5/2R1P2r/R4K2 w - - 0 1
Solved. Again Stockfish 130211 64bit - 8 threads - 2GB Hash:

Code: Select all

31    +4.92    94.6M    1&#58;04.37 h7+ Kh8 Rxa7 Rh1+ Kf2 Nxa7 Ra2 Bxa2 b6 Ra1 Ke3 Rc1 Kd2 Ra1 e3 Rg1 bxa7 Rxg6 a8=Q+ Kxh7 Qa6  <snip>
Matthew:out
Some believe in the almighty dollar.

I believe in the almighty printf statement.
Top
Tennison
Posts: 183
Joined: Sat Nov 26, 2011 2:02 pm

Re: 2 testpositions from Chessbase. White to play and win!

Post by Tennison »

George Tsavdaris wrote:From here:
http://www.chessbase.com/newsdetail.asp?newsid=8837

White to play and win? How? :D
[D]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1
Is this even solvable? Stockfish 130211 64bit - 8 threads - 2GB Hash:

Code: Select all

43    0.00    2377.9M    4&#58;50.19 Qf4 exf4 Bc3+ Qg7 Ne8 Rb1+ Kh2 Rb2+ Kg1 Rb1+ Kh2
Yes Matt It seems solvable :

1. Qf4 exf4 2. Bc3+ Qg7
3. Ne8 Rb1+ 4. Kg2 Rb2+
5. Kf1 Rb1+ 6. Ke2 Rb2+
7. Kd3 Rd2+ 8. Ke4 Re2+
9. Kd5 Rd2+ 10. Ke6 Re2+
11. Kd7 Rd2+ 12. Ke7 Re2+
13. Kd8 Rd2+ 14. Nd6 Rxd6+
15. Ke7 g5 16. Bxg7+ Kxg7
17. f8=Q+ Kg6 18. Kxd6 Nb5+
19. Ke5 Nd6 20. Qf6+ Kh5
21. Qg7 Nf7+ 22. Kf6 f3 23. Kxf7 f2
24. Qxh7# *

At least this will works ... ;-)
Top
User avatar
Ajedrecista
Posts: 1971
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Re: 2 test positions from Chessbase. White to play and win!

Post by Ajedrecista »

Hello Ben:
Tennison wrote:
George Tsavdaris wrote:From here:
http://www.chessbase.com/newsdetail.asp?newsid=8837

White to play and win? How? :D
[D]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1
Is this even solvable? Stockfish 130211 64bit - 8 threads - 2GB Hash:

Code: Select all

43    0.00    2377.9M    4&#58;50.19 Qf4 exf4 Bc3+ Qg7 Ne8 Rb1+ Kh2 Rb2+ Kg1 Rb1+ Kh2
Yes Matt It seems solvable :

1. Qf4 exf4 2. Bc3+ Qg7
3. Ne8 Rb1+ 4. Kg2 Rb2+
5. Kf1 Rb1+ 6. Ke2 Rb2+
7. Kd3 Rd2+ 8. Ke4 Re2+
9. Kd5 Rd2+ 10. Ke6 Re2+
11. Kd7 Rd2+ 12. Ke7 Re2+
13. Kd8 Rd2+ 14. Nd6 Rxd6+
15. Ke7 g5 16. Bxg7+ Kxg7
17. f8=Q+ Kg6 18. Kxd6 Nb5+
19. Ke5 Nd6 20. Qf6+ Kh5
21. Qg7 Nf7+ 22. Kf6 f3 23. Kxf7 f2
24. Qxh7# *

At least this will works ... ;-)
Please try 4.- ..., f3+ in your mainline. It looks like a draw. I wonder about the solution.

Regards from Spain.

Ajedrecista.
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: 2 testpositions from Chessbase. White to play and win!

Post by zullil »

ZirconiumX wrote:
George Tsavdaris wrote:From here:
http://www.chessbase.com/newsdetail.asp?newsid=8837

White to play and win? How? :D
[D]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1
Is this even solvable? Stockfish 130211 64bit - 8 threads - 2GB Hash:

Code: Select all

43    0.00    2377.9M    4&#58;50.19 Qf4 exf4 Bc3+ Qg7 Ne8 Rb1+ Kh2 Rb2+ Kg1 Rb1+ Kh2
Matthew:out
[D]4N2k/5Pqp/6p1/8/5p1p/n1B4P/8/1r5K w - - 4 4

Critter sees:

Code: Select all

27/44  00&#58;01    2788K   2113K  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
28/47+ 00&#58;02    4156K   1950K  +0.08 Kh2 Rb2+ Kg1 Rb1+ Kh2
28/49  01&#58;03    6414K  101332  +0.21 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/52+ 03&#58;29    9061K   43285  +0.29 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/54+ 05&#58;42   17020K   49744  +0.42 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/61+ 05&#58;48   39088K  112111  +0.61 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/61+ 06&#58;01  183152K  507190  +0.90 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/67+ 06&#58;28  491527K   1265K  +1.32 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/71+ 07&#58;08  945284K   2204K  +1.96 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/75+ 08&#58;06    1604M   3300K  +2.91 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
Top
Tennison
Posts: 183
Joined: Sat Nov 26, 2011 2:02 pm

Re: 2 test positions from Chessbase. White to play and win!

Post by Tennison »

Hi Jesus,

Yes it seems the good way : open the f file for the rook ... (even if don't take in f3 you have to take on f1 later ... ;-)

Good look you have !!! ;-)

Better is Kh2 and not being too hurry with Kg2 ... ;-)
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: 2 testpositions from Chessbase. White to play and win!

Post by zullil »

Code: Select all

29/75+ 09&#58;35    2627M   4563K  +4.34 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7
29/80+ 10&#58;53    3521M   5389K  +6.49 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nc4 Bxg7+ Kxg7 Ke7 Kh6 f8=Q+ Kh5 Qxf4
29/82+ 13&#58;08    5152M   6535K  +9.70 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 Rd7+ Kxd7 Nb5 Bxg7+ Kxg7 Ke7 Kh6 f8=Q+ Kg5 Qf7 Na7 Qf6+ Kh5 Qxf4 g5 Qf7+ Kh6 Qf6+ Kh5 Qe6 Nc8+ Qxc8 Kh6 Qe6+ Kh5 Qf7+ Kh6 Kf6
29/82+ 18&#58;22    9607M   8715K +14.52 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 g5 Bxg7+ Kxg7 f8=Q+ Kg6 Qf7+ Kh6 Kxd6 Nb5+ Ke7 Nc7 Qf5 Ne8 Qe6+ Kg7 Qf7+ Kh6 Qxe8 g4 Qc6+ Kh5 Qc5+ Kh6 Qd6+ Kh5 Qxf4 g3 Qf5+ Kh6 Qe6+ Kh5 Qg4+ Kh6 Qf4+ Kg6 Qxh4 h6 Qxg3+ Kh7 Kf6
Top
ernest
Posts: 2041
Joined: Wed Mar 08, 2006 8:30 pm

Re: 2 testpositions from Chessbase. White to play and win!

Post by ernest »

Houdini 3 finds mate.

New game
4N2k/5Pqp/6p1/8/5p1p/n1B4P/8/1r5K w - - 0 1

Analysis by Houdini 3 w32 Nlm:

............
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kh2 Rb2+
= (0.00) Depth: 37/52 00:00:05 17853kN
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kh2 Rb2+
= (0.00) Depth: 38/52 00:00:06 22460kN
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kh2 Rb2+
= (0.00) Depth: 39/55 00:00:10 38016kN, tb=3
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kh2 Rb2+
= (0.00) Depth: 40/55 00:00:12 44383kN, tb=4
1.Kh2
= (0.06 !) Depth: 41/68 00:01:25 302mN, tb=89
1.Kh2
= (0.18 !) Depth: 41/68 00:01:54 408mN, tb=201
1.Kh2
+/= (0.45 !) Depth: 41/71 00:03:21 713mN, tb=338
1.Kh2
+- (1.47 !) Depth: 41/81 00:08:59 1849mN, tb=2488
1.Kh2
+- (4.40 !) Depth: 41/82 00:17:58 3233mN, tb=4406
1.Kh2
+- (12.72 !) Depth: 41/99 01:00:15 13824mN, tb=41092
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 41/99 01:03:51 14884mN, tb=47105
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 42/99 01:03:55 14904mN, tb=47356
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 43/99 01:04:00 14924mN, tb=47717
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 44/99 01:07:20 15915mN, tb=52583
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 45/99 01:07:44 16032mN, tb=54186
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 46/99 01:08:38 16293mN, tb=59398
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 47/99 01:18:04 19093mN, tb=70506
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 48/99 01:22:29 20407mN, tb=84689
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 49/99 01:25:44 21387mN, tb=96037
1.Kh2 Rb2+ 2.Kg1 Rb1+ 3.Kf2 Rb2+ 4.Kf1 Rb1+ 5.Ke2 Rb2+ 6.Kd3 Rd2+ 7.Ke4 Re2+ 8.Kd5 Rd2+ 9.Ke6 Re2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kd8 Rd2+ 13.Nd6 Rxd6+ 14.Ke7 h5 15.Bxg7+ Kxg7 16.f8Q+ Kh7 17.Kxd6 f3 18.Ke7 f2 19.Qxf2 Kh6 20.Qf7 Kg5 21.Qf6+ Kh6 22.Kf7 Kh7 23.Qg7#
+- (#23) Depth: 50/99 01:30:11 22683mN, tb=120974
Top
zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: 2 testpositions from Chessbase. White to play and win!

Post by zullil »

ernest wrote:Houdini 3 finds mate.
I assume Critter will too. I didn't bother to continue the search. Now I'm curious. :wink:

[EDIT] Yes.

Code: Select all

Critter v1.6a 64-bit, by Richard Vida
hardware POPCNT enabled
setoption name Hash value 4096
setboard 4N2k/5Pqp/6p1/8/5p1p/n1B4P/8/1r5K w - - 4 4
info string Opening book&#58; "book.cbk" - 57853 entries &#91;native&#93;
info string GTB Init OK &#40;5 piece set&#41;
info string Using 8 thread&#40;s&#41;, 4096 MB hash LP=off
go infinite
 2/ 3  00&#58;00      249  249000 -12.75 Kg2 f3+ Kf2
 2/ 4  00&#58;00      362  362000 -12.21 Kh2 Rb2+ Bxb2 Qxb2+ Kg1
 3/ 5  00&#58;00      434  217000 -12.21 Kh2 Rb2+ Bxb2 Qxb2+ Kg1
 4/ 8  00&#58;00      725  241666  -7.66 Kh2 Rb2+ Kg1 Rg2+ Kxg2
 5/ 9  00&#58;00     1435  287000  -7.10 Kh2 Rb2+ Kg1 Rg2+ Kxg2 f3+ Kf2
 6/10  00&#58;00     1657  331400  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
 7/10  00&#58;00     1873  374600  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
 8/10  00&#58;00     2078  415600  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
 9/10  00&#58;00     2324  387333  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
10/10  00&#58;00     2745  392142  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
11/12  00&#58;00     3296  412000  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
12/16  00&#58;00     4184  418400  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
13/16  00&#58;00     5370  447500  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
14/17  00&#58;00     7698  481125  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
15/17  00&#58;00     9889  549388  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
16/17  00&#58;00    11640  582000  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
17/22  00&#58;00    18203  650107  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
18/22  00&#58;00    24558  663729  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
19/29  00&#58;00    37127  742540  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
20/29  00&#58;00    49689  801435  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
21/31  00&#58;00    77104  907105  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
22/31  00&#58;00   103853  970588  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
23/38  00&#58;00   181701   1128K  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
24/38  00&#58;00   274882   1272K  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
25/38  00&#58;00   452163   1453K  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
26/38  00&#58;00   665116   1550K  +0.00 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/46+ 00&#58;01    2268K   2060K  +0.08 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/46+ 00&#58;01    2747K   2219K  +0.21 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/46+ 00&#58;01    3450K   2383K  +0.40 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/49+ 00&#58;02    5658K   2801K  +0.69 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/57+ 00&#58;05   39524K   6589K  +1.11 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/63+ 00&#58;13  119296K   8982K  +1.75 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/65+ 00&#58;24  242366K   9959K  +2.70 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/65+ 00&#58;42  439543K  10313K  +4.13 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/74+ 00&#58;59  618942K  10384K  +6.28 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/74+ 01&#58;28  946034K  10683K  +9.49 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/78+ 02&#58;50    2065M  12146K +14.31 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/80+ 07&#58;50    6802M  14451K +21.54 Kh2 Rb2+ Kg1 Rb1+ Kh2
27/84  08&#58;46    7541M  14322K   +M23 Kh2 Rb2+ Kg1 Rb1+ Kf2 Rb2+ Kf1 Rb1+ Ke2 Rb2+ Kd3 Rd2+ Ke4 Re2+ Kd5 Rd2+ Ke6 Re2+ Kd7 Rd2+ Ke7 Re2+ Kd8 Rd2+ Nd6 Rxd6+ Ke7 g5 Bxg7+ Kxg7 f8=Q+ Kg6 Kxd6 Nb5+ Ke7 Nd6 Kxd6 g4 Ke5 h5 Qg8+ Kh6 Kf6 gxh3 Qg6#
Top
ernest
Posts: 2041
Joined: Wed Mar 08, 2006 8:30 pm

Re: 2 testpositions from Chessbase. White to play and win!

Post by ernest »

zullil wrote:Now I'm curious. :wink:
Still with Houdini 3.

Starting from the Mate position:

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1"]
[PlyCount "10"]

1. Qf4 exf4 2. Bc3+ Qg7 3. Ne8 Rb1+ 4. Kh2 Rb2+ 5. Kg1 Rb1+ *

[d]4N2k/5Pqp/6p1/8/5p1p/n1B4P/8/1r4K1 w - - 0 1

where I get a Mate in 21

6.Kf2 Rb2+ 7.Kf1 Rb1+ 8.Ke2 Rb2+ 9.Kd3 Rd2+ 10.Ke4 Re2+ 11.Kd5 Rd2+ 12.Ke6 Re2+ 13.Kd7 Rd2+ 14.Ke7 Re2+ 15.Kd8 Rd2+ 16.Nd6 Rxd6+ 17.Ke7 h5 18.Bxg7+ Kxg7 19.f8Q+ Kh7 20.Kxd6 f3 21.Ke7 f2 22.Qxf2 Kh6 23.Qf4+ g5 24.Qf7 g4 25.Kf6 gxh3 26.Qg6#
+- (#21) Depth: 41/82 00:23:50 5960mN, tb=11811

...and backtracking (keeping the hash),
all is fine until

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1"]
[PlyCount "10"]

1. Qf4 exf4 *

[d]1r3q1k/2N2P1p/6p1/8/5p1p/n6P/3B4/7K w - - 0 2

which is (accordingly) Mate in 25

2.Bc3+ Qg7 3.Ne8 Rb1+ 4.Kh2 Rb2+ 5.Kg1 Rb1+ 6.Kf2 Rb2+
+- (#25) Depth: 45/49 00:31:46 9670mN, tb=36004

But backtracking again, Houdini gives the defense 1.Qf4 h6 (instead of 1. Qf4 exf4 ) and Houdini no longer sees Mate, even after many hours

[d]1r3q1k/2N2P1p/6pQ/4p3/7p/n6P/3B4/7K w - - 0 1

1.Qf4 h6 2.Qxh6+ Qxh6 3.Bxh6 Rb1+ 4.Kg2 Rb2+ 5.Kf3 e4+ 6.Kxe4 Rf2 7.f8Q+ Rxf8 8.Bxf8 Nc4 9.Kd5 Nb2 10.Ke6 Kg8 11.Ke7 Nd3 12.Nd5 Ne5 13.Bh6 Kh7 14.Bg5 Kg8 15.Kf6 Nd7+ 16.Kxg6 Ne5+ 17.Kf5 Nf3 18.Nf4 Nd4+ 19.Kf6 Nf3 20.Ne6 Ng1 21.Bh6 Nxh3
+- (7.71) Depth: 36/92 01:22:15 18879mN, tb=33006
1.Qf4 h6
+- (7.39 --) Depth: 37/92 02:17:45 32531mN, tb=60009
1.Qf4 h6
+- (6.76 --) Depth: 37/97 21:40:33 314425mN, tb=416438
Top

Return to “Computer Chess Club: General Topics”