Author: Albert Silver
Date: 17:00:08 08/18/04
Go up one level in this thread
On August 18, 2004 at 18:46:22, Ed Schröder wrote:
>On August 18, 2004 at 09:44:46, Albert Silver wrote:
>
>Albert,
>
>I can reproduce both moves. The key to that is to clear the hash table first. In
>ChessPartner that's easy: F4 -> Clear Hash table. Under Fritz and co use the
>engine parameter:
>
> [Clear Hash Table = Always] * Always | Never | PB only
>
>My best,
>
>Ed
BTW, is this in the wb2uci or the normal personalities?
Albert
>
>======================
>
>
>>I've been having fun playing around with the settings, but have noticed some
>>really strange things happening in the automated matches played in the Fritz
>>GUI.
>>
>>I looked over the games, enjoyed Pro Deo's victories, and checked the losses of
>>course. In one game, I saw Pro Deo had a huge edge, according to both it and
>>Junior 8, yet lost. I was intrigued. Had they both seriously misevaluated the
>>position or did PD blunder horribly?
>>
>>Example:
>>
>>[D]4r1k1/1p4pp/p7/2QNpb2/4q3/1P6/1PP5/1K1R4 b - - 0 31
>>
>>The game is hardly over, but there isn't an engine that doesn't think Black has
>>a huge edge. Adn why not? Black *has* a huge edge. Black didn't blunder here,
>>but already some odd things appear. Pro Deo played 31...b5 here (with -1.91 for
>>black and 12 plies depth, and Junior expected 31...Qe2. So I run Pro Deo, with
>>my settings, and see its analysis.
>>
>>Analysis by Pro Deo 1.0:
>>
>>31...Qe2
>> -+ (-1.67) Depth: 1 00:00:00
>>31...Qg2
>> -+ (-1.76) Depth: 1 00:00:00
>>31...Qg2 32.Qc7
>> -+ (-1.64) Depth: 2 00:00:00
>>31...Qg2 32.Ne3 Qf3
>> -+ (-1.66) Depth: 3 00:00:00
>>31...Qg2 32.Ne3 Qf3 33.Rg1
>> -+ (-1.60) Depth: 4 00:00:00
>>31...Bg4
>> -+ (-1.60) Depth: 4 00:00:00
>>31...Bg4 32.Qg1 Rf8 33.Rd3
>> -+ (-1.80) Depth: 4 00:00:00
>>31...Bg4 32.Rg1 Kh8 33.Ne3 Bf3
>> -+ (-1.55) Depth: 5 00:00:00
>>31...Kh8 32.Rf1 Rd8 33.Ne3 Be6 34.Rf8+
>> -+ (-1.73) Depth: 5 00:00:00
>>31...Kh8 32.Ne3 b5 33.Rg1 Qf4 34.Qc7
>> -+ (-1.68) Depth: 6 00:00:00 78kN
>>31...Kh8 32.Ne3 Be6 33.Qb6 Qc6 34.Qb4
>> -+ (-1.68) Depth: 7 00:00:01 220kN
>>31...Kh8 32.Ne3 Be6 33.Qb6 Qc6 34.Qb4 Qf3 35.Qb6
>> -+ (-1.70) Depth: 8 00:00:01 657kN
>>31...Kh8 32.Ne3 Be6 33.Qb6 Qc6 34.Qb4 b5 35.Qh4 Rf8
>> -+ (-1.73) Depth: 9 00:00:02 1509kN
>>31...Kh8 32.Ne3 b5 33.Qe7 Bg6 34.Rf1 Kg8 35.Qg5 Qd4 36.Ka1
>> -+ (-1.69) Depth: 10 00:00:04 4017kN
>>31...Qe2 32.Rg1 Kh8 33.Qc7 Rg8 34.Nb6 Qd2 35.Rh1
>> -+ (-1.73) Depth: 10 00:00:06 5415kN
>>31...Qe2 32.Rg1 Kh8 33.Qc7 Bg6 34.Rc1
>> -+ (-1.78) Depth: 11 00:00:12 11377kN
>>31...Qe2 32.Rc1 Kh8 33.Ne7
>> -+ (-1.68) Depth: 12 00:00:23 22071kN
>>31...Kh8 32.Ne7 h6 33.Rc1 Bh7 34.Qd6
>> -+ (-1.71) Depth: 12 00:00:35 34791kN
>>31...Kh8 32.Ne3 Be6 33.Qb6 g6
>> -+ (-1.73) Depth: 13 00:01:41 97962kN
>>
>>No 31...b5 in sight, and mind you this is single CPU with no permanent brain.
>>Hmmmm!
>>
>>I pinpoint the losing blunder, squandering the draw to clear loss, and no, I
>>don't have any odd contempt values on:
>>
>>[D]4r2k/4N1pp/p7/1p2R3/8/PP6/1Kb5/8 b - - 0 38
>>
>>In this position, White is threatening Ng6+ picking up the rook. Black must keep
>>the bishop on the diagonal so as to meet Ng6 with Bxg6 protecting the rook.
>>White can therefore draw by attacking the bishop with 38.Kb2 as here, 38...Bd3
>>only move, 39.Kc3 Bb1 40.Kb2 and a repetition is in order. Instead I see
>>38...g6?? with -0.23 at 14 plies, 39.Kxc2 Kg7 40.Nf5+ Kf8 41.Rxe8 and things
>>went downhill with white winning the endgame. I honestly don't care how the
>>endgame went since when I ask Pro Deo (same settings) what it thinks of the
>>position after 38.Kb2 it says:
>>
>>38...Bxb3 39.Kxb3
>> = (0.04) Depth: 1 00:00:00
>>38...Rxe7 39.Rxe7
>> ³ (-0.31) Depth: 1 00:00:01
>>38...Bf5 39.Rxf5 Rxe7
>> -+ (-1.94) Depth: 1 00:00:01
>>38...Bg6
>> -+ (-2.04) Depth: 1 00:00:01
>>38...Bg6 39.Nxg6+ hxg6 40.Rxe8+ Kh7
>> +- (2.99) Depth: 2 00:00:01
>>38...Bd1 39.Ng6+ hxg6 40.Rxe8+ Kh7
>> = (0.08) Depth: 2 00:00:01
>>38...Bf5 39.Rxf5 Rxe7
>> -+ (-1.94) Depth: 2 00:00:01
>>38...Bf5 39.Rxf5 g5
>> ² (0.38) Depth: 3 00:00:01
>>38...Bd1 39.Ng6+ hxg6 40.Rxe8+
>> = (0.08) Depth: 3 00:00:01
>>38...Bd3 39.Kc3 Rd8
>> -+ (-1.94) Depth: 3 00:00:01
>>38...Bd3 39.Kc3 Rd8 40.Nd5
>> -+ (-1.89) Depth: 4 00:00:01
>>38...Bd3 39.Kc3 Rd8 40.Nc6 Rc8 41.Kxd3
>> -+ (-1.86) Depth: 5 00:00:01
>>38...Bd3 39.Kc3 Rd8 40.Nc6 Rc8 41.Kxd3 Rxc6
>> -+ (-1.86) Depth: 6 00:00:01 13kN
>>38...Bd3 39.Kc3 Rd8 40.Nc6 b4+ 41.Nxb4 Bb5
>> µ (-0.87) Depth: 7 00:00:01 25kN
>>38...Bd3 39.Kc3 Rd8 40.Nc6 b4+ 41.Nxb4 Bb5 42.Nd5
>> µ (-0.89) Depth: 8 00:00:01 45kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 9 00:00:02 119kN
>>38...Bxb3 39.Kxb3 Rf8 40.Nd5 Rf3+ 41.Kb4 g6 42.Re6 Rf5
>> = (0.00) Depth: 9 00:00:02 369kN
>>38...Bxb3 39.Kxb3 Rf8 40.Re6 Rf3+ 41.Kb4 Rf4+ 42.Kc5 Ra4 43.Nf5 h5 44.Re8+ Kh7
>> = (0.00) Depth: 10 00:00:02 730kN
>>38...Bxb3 39.Kxb3 Rf8 40.Re6 Rf6 41.Rxf6 gxf6 42.Kb4 Kg7 43.Kc5 h5 44.Nf5+ Kg6
>> = (0.00) Depth: 11 00:00:03 2473kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 11 00:00:04 2811kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 12 00:00:04 3593kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 13 00:00:07 6793kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 14 00:00:13 12772kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 15 00:00:29 31455kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 16 00:01:09 76135kN
>>38...Bd3 39.Kc3 Bb1 40.Kb2 Bd3
>> = (0.00) Depth: 17 00:03:18 224497kN
>>
>>So how the heck did 38...g6 get played?? Ed? Anyone?
>>
>>My settings have been on my Athlon 2400XP+ with 256 MB ram:
>>
>>Nunn I set, 30 mins + 2 sec increment, 64 MB hash for Junior 8 and w6 setting
>>(60 MB hash) for Pro Deo, permanent brain off.
>>
>> Albert
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