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Subject: Re: Position analysis - Help needed!

Author: Dann Corbit

Date: 17:26:37 09/01/99

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On September 01, 1999 at 19:45:13, Phil Dixon wrote:
>r2k3r/p1p2ppp/3b4/1B1n4/3Pp1bq/5PN1/PP1P1KPP/RNBQ3R b - - 0 13
>
>I would be interested in different programs analysis of this position and what
>some good player's analysis of the position would be?  Obviously, Black is down
>a piece.  Is there positional compensation, how much?
>
>Black to move. I haven't been able to find a refutation.  Could you run this on
>your Xeon box for a while, Bob?  I would be most grateful.

Can't turn an onion into an apple, no matter how long you shine it, I'm afraid.

Here's the crafty result at approximately C.A.P. time controls:
PFGA: EPD record: 1
middle-game phase
              clearing hash tables
              time surplus   0.00  time limit 16:40 (16:40)
          s   depth   time  score   variation (1)
Black(0): exit

                6->   2:30  -3.59   1. ... exf3 2. gxf3 Bd7 3. Bxd7 Qxd4+
                                    4. Ke1 Qe5+ 5. Qe2 Qxe2+ 6. Nxe2 Kxd7
                7     3:24  -3.34   1. ... exf3 2. gxf3 Bd7 3. Bxd7 Qxd4+
                                    4. Ke1 Kxd7 5. d3 Rae8+ 6. Kf1
                7->   3:33  -3.34   1. ... exf3 2. gxf3 Bd7 3. Bxd7 Qxd4+
                                    4. Ke1 Kxd7 5. d3 Rae8+ 6. Kf1
                8     3:43  -3.22   1. ... exf3 2. gxf3 Bd7 3. Bxd7 Qxd4+
                                    4. Ke1 Kxd7 5. Ne4 Rae8 6. d3
                8->   3:48  -3.22   1. ... exf3 2. gxf3 Bd7 3. Bxd7 Qxd4+
                                    4. Ke1 Kxd7 5. Ne4 Rae8 6. d3
                9     4:07  -3.33   1. ... exf3 2. gxf3 Bh3 3. Ke2 Qxd4
                                    4. Qa4 Nf4+ 5. Kd1 Qxa4+ 6. Bxa4 Bg2
                                    7. Bc6 Bxh1 8. Bxa8
                9->   4:28  -3.33   1. ... exf3 2. gxf3 Bh3 3. Ke2 Qxd4
                                    4. Qa4 Nf4+ 5. Kd1 Qxa4+ 6. Bxa4 Bg2
                                    7. Bc6 Bxh1 8. Bxa8
               10     5:09     ++   1. ... exf3!!
               10->   6:41  -2.94   1. ... exf3 2. gxf3 Bh3 3. Ke2 Qxd4
                                    4. Qa4 Nf4+ 5. Kd1 Qxa4+ 6. Bxa4 Bg2
                                    7. Bc6 Bxh1 8. Bxa8
               11     9:43  -2.74   1. ... exf3 2. gxf3 Bh3 3. Ke2 Qe7+
                                    4. Ne4 f5 5. Bc6 Nf4+ 6. Ke3 Rb8 7.
                                    d3 fxe4 8. dxe4
               11->  12:16  -2.74   1. ... exf3 2. gxf3 Bh3 3. Ke2 Qe7+
                                    4. Ne4 f5 5. Bc6 Nf4+ 6. Ke3 Rb8 7.
                                    d3 fxe4 8. dxe4
              time=16:40  cpu=99%  mat=-4  n=111561877  fh=94%  nps=111484
              ext-> checks=9416964 recaps=266739 pawns=14595 1rep=580464
thrt:12767
              predicted=0  nodes=111561877  evals=13358896
              endgame tablebase-> probes done=0  successful=0



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