Author: Andrew Williams
Date: 09:48:36 06/26/03
Go up one level in this thread
On June 26, 2003 at 11:18:26, Igor Gorelikov wrote:
>One Test position
>==================
>
>There is a section of everyday's puzzles on my site:
>http://www.digichess.gr/infiniteloop/home.php
>
>All puzzles are taken from engine to engine games of Infinite Loop.
>
>Prior to publish a puzzle on my site I always offer Crafty 19.3 to solve it.
>
>I was amazed that today's puzzle was hard to solve even for Crafty so it
>can be a good test position for any chess engine.
>
>What Phalanx XXII (engine number 10 among free WB engines) plays here as
>white (and find it at once)?
>
>[D] r1bq3r/ppp3pp/3k4/3p4/3nP1Q1/8/PP4PP/RN3RK1 w - - 0 17
>
>PS: Yace can find it after some time too.
>
>Best regards,
>Igor Gorelikov
PostModernist (Athlon 1200) likes e5+ after about 2.5 seconds and sticks with it
for a long time. It's currently searching depth 14 after 31 minutes, and the
score is rising above +1 for the first time:
8> +0.00 00:00:01.29 124572 1.Qg3 Ke6 2.Qg4 Kd6 3.Qg3 Ke6 4.Qg4 Kd6
5.Qg3 Ke6 6.Qg4 Kd6 7.Qg3 Ke6 8.Qg4 Kd6
8b +0.01 00:00:02.51 273552 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4
8< +0.36 00:00:03.06 357675 1.e5
8= +0.34 00:00:03.07 359990 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 c6 4.Qf4 Kc5
5.b4 Kb6 6.Nc3
9< +0.34 00:00:08.25 1139143 1.e5
9> +0.25 00:00:08.98 1287446 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 Rf8
5.Qb4 Kd7 6.Qxb7
9= +0.26 00:00:09.17 1342746 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 Rf8
5.Qb4 Kd7 6.Qxb7
10> +0.26 00:00:09.98 1454792 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 Rf8
5.Rfe1 Ke7 6.Rad1
10< +0.82 00:00:28.91 4055771 1.e5
10= +0.75 00:00:31.10 4507277 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 Rf8
5.Ne4 Kc6 6.Rfc1 Kd7 7.Nc5
11< +0.75 00:01:23.76 11351577 1.e5
11> +0.61 00:01:47.63 15449058 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6
5.Ne4 Kc7 6.Qe5 Kb6 7.Qxe6 dxe4 8.Qxe4
11= +0.65 00:01:48.33 15571854 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6
5.Ne4 Kc7 6.Qe5 Kb6 7.Qxe6 dxe4 8.Qxe4
12< +0.65 00:04:48.80 41307350 1.e5
12> +0.45 00:07:08.63 64619637 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Re1 Kd7
5.Nc3 c6 6.Qg7 Qe7 7.Qe5 Qf7
12= +0.50 00:07:09.79 64831671 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Re1 Kd7
5.Nc3 c6 6.Qg7 Qe7 7.Qe5 Qf7
13> +0.50 00:07:47.04 69753705 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6
5.Ne4 Kc7 6.Nc5 Qd6 7.Qg7 Bd7 8.Nxd7 Qxd7
9.Rf7
13< +0.85 00:25:22.84 221484627 1.e5
13= +0.83 00:26:17.63 230022136 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6
5.Rae1 Re8 6.Qg7 Qc7 7.Qe5 Kd7
14> +0.83 00:29:35.61 254958737 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6
5.Rae1 Re8 6.Qg7 Qc7 7.Ne4 dxe4 8.Rd1
It's going to take a long time to complete depth 14, so here is PM's "analysis
mode" output after 37 minutes:
time:00:37:48:04
depth=14 score=+125
nodes=319377591 nps=140756
[+125 <= +132 <= +100000]
PV: 1.e5 Kxe5 2.Qxg7 Kd6 3.Qxd4 Be6 4.Nc3 c6 5.Rae1 Re8
6.Qg7 Qc7 7.Ne4 dxe4 8.Rd1
This means that PM's MTD(f) search has established that the score is > +1.25 and
is now checking to see if it's higher or lower than +1.32
Cheers
Andrew
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