Author: Dieter Buerssner
Date: 06:56:08 11/25/00
Go up one level in this thread
On November 25, 2000 at 02:31:18, Timothy J. Frohlick wrote:
>Can your program solve this queen trap problem. It may not be possible to solve
>with any of todays programs.
>
>r3k2r/pp2ppbp/1q4p1/2npP3/5P2/2P5/PP4PP/RNBQR2K w
>
>This is an actual position that I got myself into when playing Rebel Century 3.0
>on my PII 333 64 MB RAM at 40/120. The move sequence with me to move is:
>
>1. Be3 Qxb2 2. Bxc5 Qxa1 3. Qa4+ Kf8 4. Qc2!! b6 5. Bd4 Rc8 6. Rd1 e6
>7. Na3 Qxd1 8. Qxd1 and the score is +2.30 in whites' favor.
>
>I found that neither RC3 nor Gambit Tiger would choose the move 1. Be3.
>
>Will any program on faster machines find that first move for white? After that
>move will any program not select the pawn and then the rook capture?
I see, that you and Ferdinand allready tried Yace. With my current version
I get slightly different results. For the position above, Be3 is found
after 73 seconds at depth 10.
6736986 48.82 0.06 10t : 1. Qc2 Rc8 2. Be3 Qb5 3. Bxc5 Qxc5 4. Nd2 Qf2 5.
Rf1 Qe2 6. Rad1 {-10}
9999715 72.97 0.07 10t+: 1. Be3 Qxb2 2. Bxc5 Qxa1 3. Qxd5 Qb2 4. e6 fxe6
5. Qxe6 Qxb1 6. Rxb1 Bxc3 {421}
12109513 88.42 0.12 10t : 1. Be3 Qc6 2. Bxc5 Qxc5 3. Nd2 e6 4. Qb3 Qc6 5.
Rad1 Rc8 6. Qb4 {-10}
[...]
44915554 333.2 0.16 12t : 1. Be3 Qc6 2. Na3 Ne4 3. Qe2 Kf8 4. c4 e6 5.
cxd5 exd5 6. Rac1 Qa6 7. Qc2 {0}
Note, that Qxb2 is only considered as response in the variation, that
actually failed high in zero window search at root (10t+). The real PV never
shows Qxb2.
Instead of 3. Qa4 in your line, Yace thinks Qb3 is better. Qb3 fails high
after 34 seconds with a convincingly high score.
1744860 9.486 0.34 8. : 3. Qxd5 Qb2 4. e6 Bf6 5. exf7+ Kf8 6. Qe6 Kg7 7.
Bxe7 Bxc3 8. Nxc3 Qxc3 {-70}
3507129 19.47 0.49 9t : 3. Qxd5 Rd8 4. Qxb7 Rd7 5. Qa8+ Rd8 6. Qc6+ Kf8
7. e6 Bf6 8. exf7 Kxf7 9. Qe6+ Kg7 10. Bxe7 {0}
6154885 34.34 0.50 9t+: 3. Qb3 Kf8 4. Ba3 Re8 5. Bb2 Kg8 6. Bxa1 Bxe5
{681}
9503686 54.94 3.08 9t : 3. Qb3 Rc8 4. Ba3 Rxc3 5. Qxb7 Bf8 6. Qa8+ Kd7
7. Qxd5+ Kc7 8. Qa5+ Kb8 9. Qxc3 Qxa2 10. Rc1
{260}
[...]
19888233 113.1 3.71 10t : 3. Qb3 Rb8 4. Ba3 Bh6 5. Bb2 Qxb2 6. Qxb2 Bxf4
7. g3 Bg5 8. Qb5+ Kf8 9. Qxd5 {411}
This is on a AMD K6-2 475.
Regards,
Dieter
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.