Author: Ed Schröder
Date: 15:46:22 08/18/04
Go up one level in this thread
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 ====================== >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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