Author: Dieter Buerssner
Date: 09:39:54 11/11/00
Go up one level in this thread
On November 11, 2000 at 04:05:15, Uri Blass wrote:
>[D]3r2k1/5p1p/p2p1Q2/1p2pN1P/4p1P1/1b3P2/1q6/3RK1R1 b - - 0 1
>
>Gandalf see a small positive evaluation for black in this position and has
>terrible function at depth 9.
>The branching factor is clearly more than 10.
I also get a bad branching factor at depth 8 here with Yace. But I think, this
can be expected, because of a big fail low (from -5 to -mate -12). The hash
table information will not be of so much use anymore, and also, the move
ordering will be worse. The mate score is shown after about 77 seconds at depth
8. I paste the output of depth 9 - didn't change at 10. At depth 8 not
the whole line was shown, because some moves where not in the hash anymore:
27939751 202.6 -Mat12 10t : Qb2c3+ Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+
Kg3h3 Qf4xf3+ Kh3h2 Qf3f4+ Rg1g3 Qf4f2+ Rg3g2
Qf2f4+ Kh2h3 Qf4e3+ Rg2g3 Qe3h6 Nf5xh6+ Kg8f8
Qf6xd8+ Kf8g7 Nh6f5+ [-1090]
>Computers cannot see that 5.Qxf6 is winning because they are weak at tactics and
>do not know to extend the right lines and I think that no program of today can
>see it but if I am wrong then please tell me if there is a program that find
>that 5.Qxf6 is winning.
>
>Here is the relevant position before 5.Qxf6
>
>[D]2rr2k1/5p1p/p2p1b1Q/1p1bpN1P/2q1p1P1/5P2/PPP5/1K1R2R1 w - - 0 1
My current version switches to Qxf6 after 55 seconds with draw score. Score
rises slowly. 1. comlumn is nodes, second time in seconds, third score,
4th depth. The + and ++ lines are the lines that actually failed high.
AMD K6-2 475, 35M hash.
9188416 55.72 -0.12 9t+: Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Bd5b3+ Kc2d2
Qa2xb2+ Kd2e1 Qb2c3+ Rd1d2 Qc3c1+ Ke1e2 Bb3c4+
Ke2f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3g2 e4xf3+ Kg2h3
Qf4xf5 g4xf5+ Kg8f8 [250]
10844794 66.41 0.00 9t : Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Bd5b3+ Kc2d2
Qa2xb2+ Kd2e1 Qb2c3+ Rd1d2 Qc3c1+ Ke1e2 Bb3c4+
Ke2f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3g2 Qf4xf3+ Kg2h2
Qf3f2+ Kh2h1 Qf2f3+ Kh1h2 [-410]
..
23845815 147.6 0.10 10t : Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Rd8c8+ Kc2d2
Rc8c2+ Kd2xc2 Bd5b3+ Kc2d2 Qa2xb2+ Kd2e1 Qb2c3+
Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3h3
Qf4xf3+ Kh3h4 Qf3f2+ Rg1g3 Qf2h2+ Rg3h3 Qh2f2+
Kh4g5 [90]
..
56495980 354.4 0.50 11++: Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Rd8c8+ Kc2d2
Rc8c2+ Kd2xc2 Bd5b3+ Kc2d2 Qa2xb2+ Kd2e1 Qb2c3+
Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3h3
Qf4xf3+ Kh3h4 Qf3f2+ Rg1g3 Qf2f3 Rg3xf3 e4xf3
[590]
91460698 586.9 1.36 11t : Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Rd8c8+ Kc2d2
Rc8c2+ Kd2xc2 Bd5b3+ Kc2d2 Qa2xb2+ Kd2e1 Qb2c3+
Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3h3
Qf4xf3+ Kh3h4 Qf3f2+ Rg1g3 Qf2h2+ Kh4g5 Qh2d2+
Rg3e3 h7h6+ Nf5xh6+ Kg8f8 Nh6f5 [170]
...
175546381 1120.9 1.76 12++: Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Rd8c8+ Kc2d2
Rc8c2+ Kd2xc2 Bd5b3+ Kc2d2 Qa2xb2+ Kd2e1 Qb2c3+
Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3h3
Qf4xf3+ Kh3h4 Qf3f2+ Rg1g3 Qf2h2+ Kh4g5 Qh2xg3
Nf5xg3 e4e3 [590]
270982548 1726.2 2.17 12t : Qh6xf6 Qc4xa2+ Kb1c1 Rc8xc2+ Kc1xc2 Rd8c8+ Kc2d2
Rc8c2+ Kd2xc2 Bd5b3+ Kc2d2 Qa2xb2+ Kd2e1 Qb2c3+
Rd1d2 Qc3c1+ Ke1f2 Qc1xd2+ Kf2g3 Qd2f4+ Kg3h3
Qf4xf3+ Kh3h4 Qf3f2+ Rg1g3 Qf2h2+ Kh4g5 Qh2d2+
Rg3e3 h7h6+ Nf5xh6+ Kg8h7 Qf6f5+ Kh7h8 Qf5xe4
[250]
I believe with more patience, a higher score will be shown.
Regards,
Dieter
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