Author: Jeremiah Penery
Date: 17:30:12 10/31/02
Go up one level in this thread
On October 31, 2002 at 20:11:29, Dann Corbit wrote:
>On October 31, 2002 at 17:44:34, Dadi Jonsson wrote:
>
>>On October 31, 2002 at 17:34:33, Dann Corbit wrote:
>>
>>>On October 31, 2002 at 17:32:12, Dadi Jonsson wrote:
>>>
>>>>The following sac was "truly unexpected". The player of the black pieces wrote a
>>>>book(?) including this game and said he nearly fell off his chair when he saw
>>>>White's next move. It is understandable that the move was unexpected. White
>>>>sacrifice's his rook for the pawn on e6, which is thoroughly protected by two
>>>>other pawns. Few human beings would have the imagination required to even start
>>>>thinking about this possibility. This move is on Tim Krabbe's list of the
>>>>greatest moves ever played.
>>>>
>>>>In spite of the above, this may not be such a spectacular move to a chess
>>>>program! Many of them will find this move, given enough time. I believe that the
>>>>original poster was asking for "truly unexpected sac" for us human beings and
>>>>that is a different story!
>>>>
>>>> [D] rn1r2k1/pq1p1ppp/3Rp3/2p5/2P1b3/4QNP1/P3PPBP/3R2K1 w - -
>>>
>>>They tend to find Morphy's brilliant moves quickly. His tactical greatness
>>>seems to be easily matched by modern hardware.
>>
>>This game was played in 1990, so it wasn't Morphy who found this move. I also
>>think that few (if any) programs would find this move under tournament
>>time-controls (unless you piled a number of CPUs on it).
>
>No program I have tried finds it by search, but many of them have it in their
>opening book. For example:
This is the latest modified Crafty I've been working on. I haven't had much
time to change things in the past few days, so some new attack evaluation I've
written isn't tuned very well for some positions, but it does well here.
White(1): rn1r2k1/pq1p1ppp/3Rp3/2p5/2P1b3/4QNP1/P3PPBP/3R2K1 w - -
White(1): analyze
Analyze Mode: type "exit" to terminate.
clearing hash tables
time surplus 0.00 time limit 30.00 (3:30)
depth time score variation (1)
9 4.14 0.09 1. Qxc5 Nc6 2. Qe3 f5 3. Qd2 Qa6 4.
c5 Qc4 5. Rxd7 Rxd7 6. Qxd7 Qxa2
9-> 7.95 0.09 1. Qxc5 Nc6 2. Qe3 f5 3. Qd2 Qa6 4.
c5 Qc4 5. Rxd7 Rxd7 6. Qxd7 Qxa2
10 14.92 0.11 1. Qxc5 Nc6 2. Qh5 f6 3. Ng5 Bg6 4.
Bxc6 Qxc6 5. Rxc6 Bxh5
10 23.51 0.14 1. Rxe6 fxe6 2. Ng5 h6 3. Nxe4 Nc6
4. Nxc5 Qc8 5. Qd2 d6 6. Bxc6 dxc5
10-> 24.47 0.14 1. Rxe6 fxe6 2. Ng5 h6 3. Nxe4 Nc6
4. Nxc5 Qc8 5. Qd2 d6 6. Bxc6 dxc5
11 32.58 ++ 1. Rxe6!!
11 39.78 0.63 1. Rxe6 fxe6 2. Ng5 Nc6 3. Qxe4 g6
4. Nxe6 dxe6 5. Qxe6+ Kg7 6. Rxd8 Rxd8
7. Bxc6
11-> 47.53 0.63 1. Rxe6 fxe6 2. Ng5 Nc6 3. Qxe4 g6
4. Nxe6 dxe6 5. Qxe6+ Kg7 6. Rxd8 Rxd8
7. Bxc6
12 1:00 0.51 1. Rxe6 fxe6 2. Ng5 Nc6 3. Qxe4 g6
4. Qh4 h5 5. Qf4 Rf8 6. Qd6 Rab8 7.
Qxc5
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