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Subject: Re: Interesting position -- how to take back?

Author: Dann Corbit

Date: 20:03:39 06/20/02

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On June 20, 2002 at 20:34:11, Rob Shultz wrote:

>On June 20, 2002 at 19:43:43, John Merlino wrote:
>
>>This position is from one of the games that Ali Mirafzali posted between CM8000
>>and a Master named Kamberi, rated 2350.
>>
>>[D]r1b1r1k1/1p3p2/2p1nq1b/2P1p1pp/1PB1PB2/2N1QN1P/3R1PP1/1R4K1 b - - 0 26
>>
>>Black has four ways to take back. What does your program say is the best?
>>
>>CM9000, on a PIII-600, prefers Nxf4. Kamberi played exf4, which CM thinks is the
>>worst of the four possibilities.
>>
>>Time	Depth	Score	Positions	Moves
>>0:00	1/3	0.69	1101		26...exf4 27.Qd3 Rd8
>>0:00	1/4	0.47	2050		26...exf4 27.Qd3 Rd8 28.Qc2 Bg7
>>0:00	1/5	0.79	8509		26...exf4 27.Qd3 Rd8 28.Qc2 Bg7
>>					29.e5 Rxd2 30.Qxd2
>>0:00	1/5	0.71	12456		26...gxf4 27.Qd3 Rd8 28.Qc2 Nd4
>>					29.Nxd4 exd4
>>0:00	1/6	0.54	33767		26...gxf4 27.Qd3 Bg7 28.Re1 Nd4
>>					29.Nxd4 exd4
>>0:01	1/7	0.56	87600		26...gxf4 27.Qd3 Bg7 28.Re1 Nd4
>>					29.Nxd4 exd4 30.Ne2
>>0:03	1/8	0.53	187667		26...gxf4 27.Qd3 Bg7 28.Rbd1 Qe7
>>					29.Ne2 Rd8 30.Qc2
>>0:07	1/8	0.39	434519		26...Qxf4 27.Qxf4 exf4 28.Rd3 Bg7
>>					29.Bxe6 Bxe6 30.Nxg5 Bc4
>>0:11	1/8	0.33	691576		26...Nxf4 27.Rd6 Ne6 28.Qe2 Bf8
>>					29.Rdd1 Nd4 30.Nxd4 exd4
>>0:32	1/9	0.00	2123702		26...Nxf4 27.Rd6 Be6 28.Bxe6 Rxe6
>>					29.Rxe6 Qxe6 30.Ne2 Qa2 31.Nc3 Qe6
>>0:54	1/10	0.08	3732873		26...Nxf4 27.Rd6 Be6 28.Bxe6 Rxe6
>>					29.Rxe6 Qxe6 30.Ne2 Nxe2+ 31.Qxe2
>>					Ra2 32.Qd3 g4
>>3:02	2/11	-0.13	13075813	26...Nxf4 27.Ne1 g4 28.Rd6 Ne6
>>					29.Qg3 Bf8 30.Bxe6 Bxe6 31.hxg4
>>					Bxd6 32.gxh5+ Qg7 33.Qxg7+ Kxg7
>>					34.cxd6
>>
>>jm
>
>
>Gandalf 5.1, on a PIII 733MHz, likes the following line after 3 minutes.
>
>00:03:16.8   -0.06    12    32520768	exf4 Qd3 g4 e5 Qg7 hxg4 hxg4 Nh4 f3 Nf5 Nf4
>Nxg7 Nxd3 Rxd3 Bxg7

yace:

r1b1r1k1/1p3p2/2p1nq1b/2P1p1pp/1PB1PB2/2N1QN1P/3R1PP1/1R4K1 b - -
Stored 8 learned positions into hash table
solution
no solutions
usetime = 998.00, mintime = 998.00 maxtime = 998.00 tl 998.00 ml 0
        16   0.031  -0.65  1t  1...Nxf4 {10}
        53   0.033  -0.65  1.  1...Nxf4 {10}
       261   0.035  -0.89  2t  1...Nxf4 2.Rbd1 {10}
       358   0.036  -0.84  2t+ 1...Qxf4 2.Ra1 {10}
       505   0.037  -0.74  2t  1...Qxf4 2.Qd3 {10}
      1238   0.040  -0.74  2.  1...Qxf4 2.Qd3 {10}
      2909   0.047  -0.77  3t  1...Qxf4 2.Qxf4 Nxf4 3.Rbd1 {10}
      4029   0.051  -0.74  3t+ 1...Nxf4 2.Re1
      4269   0.052  -0.71  3t  1...Nxf4 2.Rbd1 Be6 {10}
      5017   0.054  -0.71  3.  1...Nxf4 2.Rbd1 Be6 {10}
      7593   0.063  -0.81  4t  1...Nxf4 2.Rd6 Be6 3.Rbd1 {10}
      9715   0.070  -0.80  4t+ 1...Qxf4 2.Nxe5 Qxe5 3.Rbd1 {270}
     11567   0.076  -0.68  4t  1...Qxf4 2.Qxf4 Nxf4 3.Rbd1 g4 {10}
     13634   0.080  -0.67  4t+ 1...exf4 2.Qd3 Rd8 3.Bb3 {10}
     14588   0.084  -0.65  4t  1...exf4 2.Qd3 Rd8 3.Qc2 {10}
     16521   0.092  -0.65  4.  1...exf4 2.Qd3 Rd8 3.Qc2 {10}
     18989   0.100  -0.52  5t  1...exf4 2.Qd3 Rd8 3.Qc2 Bd7 {10}
     32295   0.130  -0.52  5.  1...exf4 2.Qd3 Rd8 3.Qc2 Bd7 {10}
     54517   0.180  -0.59  6t  1...exf4 2.Qd3 Rd8 3.Qc2 Nd4 4.Nxd4 Rxd4H {10}
    109898   0.319  -0.59  6.  1...exf4 2.Qd3 Rd8 3.Qc2 Nd4 4.Nxd4 Rxd4 {10}
    145264   0.404  -0.59  7t  1...exf4 2.Qd3 Rd8 3.Qc2 Nd4 4.Nxd4 Rxd4 {10}
    339130   0.972  -0.58  7t+ 1...Qxf4 2.Qxf4 Nxf4 3.Rbd1 g4 4.Rd8 Be6 5.Re1
                               {10}
    438531   1.285  -0.55  7t  1...Qxf4 2.Qxf4 Nxf4 3.Rd6 Ra3 4.Rxh6 Rxc3
                               5.Nd2 {0}
    675281   1.999  -0.54  7t+ 1...Nxf4 2.Rd6 Be6 3.Bxe6 Rxe6 4.Rd7 g4 5.Rf1
                               gxf3 6.Qxf4 {10}
    738428   2.177  -0.53  7t  1...Nxf4 2.Rd6 Be6 3.Bxe6 Rxe6 4.Rd7H g4H
                               5.hxg4H {-70}
    793781   2.334  -0.53  7.  1...Nxf4 2.Rd6 Be6 3.Bxe6 Rxe6 4.Rd7 g4 5.hxg4
                               {-70}
   2285761   6.326  -0.30  8t  1...Nxf4 2.Nh2 g4 3.Rd6 Be6 4.hxg4 Bf8 5.Rxe6
                               {-420}
   2547309   7.044  -0.30  8.  1...Nxf4 2.Nh2 g4 3.Rd6 Be6 4.hxg4 Bf8 5.Rxe6
                               {-420}
   5516483  14.277  -0.30  9t  1...Nxf4 2.Nh2 g4 3.Rd6 Be6 4.hxg4 Bf8 5.Rxe6
                               fxe6 {80}
   6190547  16.045  -0.30  9.  1...Nxf4 2.Nh2 g4 3.Rd6 Be6 4.hxg4 Bf8 5.Rxe6
                               fxe6 {80}
  18884023  48.576  -0.11 10t  1...Nxf4 2.Ne1 g4 3.Rd6 Be6 4.hxg4 hxg4 5.Qg3
                               Qg5 6.Bxe6 Rxe6 {10}
  21464438  55.690  -0.11 10.  1...Nxf4 2.Ne1 g4 3.Rd6 Be6 4.hxg4 hxg4 5.Qg3
                               Qg5 6.Bxe6 Rxe6 {10}
  40299374  1:45.8  -0.26 11t  1...Nxf4 2.Ne1 g4 3.Rd6 Qg5 4.hxg4 Bxg4 5.b5
                               Qg7 6.Kf1 Bg5 7.Nf3 {HT} {10}
  44529755  1:57.7  -0.25 11t+ 1...exf4 2.Qd3 Rd8 3.Qc2 Rxd2 4.Qxd2 g4 5.hxg4
                               hxg4 6.Qxf4 Nxf4 7.e5 {931}
  49420432  2:12.0   0.09 11t  1...exf4 2.Qd3 g4 3.hxg4 hxg4 4.Nh2 Qg7 5.Ra2
                               Rxa2 6.Nxa2 f3 7.Rd1 Bf4H {10}
  54829371  2:26.9   0.09 11.  1...exf4 2.Qd3 g4 3.hxg4 hxg4 4.Nh2 Qg7 5.Ra2
                               Rxa2 6.Nxa2 f3 7.Rd1 Bf4 {10}
  68387448  3:02.3   0.11 12t  1...exf4 2.Qd3 g4 3.hxg4 hxg4 4.Nh2 Qg7 5.Ra2
                               Rxa2 6.Bxa2 Rd8 7.Qc2 f3 8.Bc4 {10}
  94184217  4:14.9   0.11 12.  1...exf4 2.Qd3 g4 3.hxg4 hxg4 4.Nh2 Qg7 5.Ra2
                               Rxa2 6.Bxa2 Rd8 7.Qc2 f3 8.Bc4 {10}
 137140015  6:23.8   0.05 13t  1...exf4 2.Qd3 g4 3.hxg4 hxg4 4.e5 Qg7 5.Nh4
                               Qxe5 6.Nf5 Bf8 7.Nd6 Bxd6 8.cxd6 {80}




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