Author: Frank E. Oldham
Date: 15:24:05 02/24/04
Go up one level in this thread
On February 23, 2004 at 06:15:51, Albert Silver wrote:
>On February 22, 2004 at 22:28:29, Albert Silver wrote:
>
>>On February 22, 2004 at 04:02:32, Kurt Utzinger wrote:
>>
>>>[D]rnb1k2r/pp1pp1bp/6p1/2pn2B1/8/2NB1N2/PqPQ2PP/1R2K2R w Kkq - 0 11
>>>Reti,R - Euwe,M (Amsterdam 1920)
>>>Position before 11.Nxd5!! (or ?!)
>>>
>>>
>>>[Event "Amsterdam m"]
>>>[Site "Amsterdam"]
>>>[Date "1920.??.??"]
>>>[Round "2"]
>>>[White "Reti, Richard"]
>>>[Black "Euwe, Max"]
>>>[Result "1-0"]
>>>[ECO "A83"]
>>>[PlyCount "33"]
>>>[EventDate "1920.??.??"]
>>>
>>>1. d4 f5 2. e4 fxe4 3. Nc3 Nf6 4. Bg5 g6 5. f3 exf3 6. Nxf3 Bg7 7. Bd3 c5 8. d5
>>>Qb6 9. Qd2 Qxb2 10. Rb1 Nxd5 11. Nxd5 Qxb1+ 12. Kf2 Qxh1 13. Bxe7 d6 14. Bxd6
>>>Nc6 15. Bb5 Bd7 16. Bxc6 bxc6 17. Qe2+ 1-0
>>
>>Since Hurd showed that Shredder 8 had a vague idea of the value of Nxd5, I
>>entered the first 4 plies and let Shredder 7.04 sit on it to see if it broke
>>away from the perpetual it was displaying in the mainline. Until ply 14 nothing,
>>but then it did a huge leap forward.
>>
>>Analysis by Shredder 7.04:
>>
>>13.Nc7+ Kd8 14.Bxe7+ Kxc7 15.Qf4+ Kb6 16.Qd6+ Nc6 17.Qxc5+ Kc7 18.Bd6+ Kd8
>>19.Qg5+ Ke8 20.Bxg6+ hxg6 21.Qxg6+ Kd8 22.Qxg7 Qa1 23.Qxa1 Rh6
>>+- (3.02) Depth: 15/49 00:20:35 280318kN
>>(Silver, Private 23.02.2004)
>
>Even more interesting was to see that Fritz 8 agrees with Reti's choice of
>13.Bxe7 contrary to the other engines, albeit after at least 1 hour on my Athlon
>1 GHz, and with the first 4 plies of the line fed to it:
>
>Reti,R - Euwe,M
>rnb1k2r/pp1pp1bp/6p1/2pN2B1/8/3B1N2/P1PQ1KPP/7q w kq - 0 1
>
>Analysis by Fritz 8:
>
>13.Nc7+ Kd8 14.Bxe7+ Kxe7 15.Qg5+ Kd6 16.Nb5+ Kc6 17.Qg3 Qxh2 18.Qxh2 c4 19.a4
>Kb6 20.Nc7 cxd3 21.Nxa8+
> ³ (-0.69) Depth: 11/38 00:00:24 10251kN
>13.Nc7+!
> ³ (-0.41) Depth: 12/39 00:02:16 56352kN
>13.Nc7+!
> = (-0.12) Depth: 12/39 00:02:19 57575kN
>13.Nc7+ Kd8 14.Bxe7+ Kxc7 15.Qf4+ Kb6 16.Qd6+ Nc6 17.Qxc5+ Kc7
> = (0.00) Depth: 12/43 00:02:44 69202kN
>13.Nc7+ Kd8 14.Bxe7+ Kxc7 15.Qf4+ Kb6 16.Qd6+ Nc6 17.Qxc5+ Kc7 18.Qd6+ Kb6
>19.Qc5+
> = (0.00) Depth: 13/48 00:04:32 117650kN
>13.Nc7+ Kd8 14.Bxe7+ Kxc7 15.Qf4+ Kb6 16.Qd6+ Nc6 17.Qxc5+ Kc7 18.Qd6+ Kb6
>19.Qc5+
> = (0.00) Depth: 14/46 00:10:00 259328kN
>13.Bxe7
> = (0.03) Depth: 14/46 01:18:01 1000228kN
>13.Bxe7
> = (0.19) Depth: 14/46 01:28:26 1270043kN
>13.Bxe7
> ² (0.50) Depth: 14/46 01:42:30 1636963kN
>13.Bxe7 Qa1 14.Bd6 Rf8 15.Qe2+ Kf7 16.Bc4 Kg8 17.Nc7+ Kh8 18.Bxf8 Bd4+ 19.Kg3 d5
> ± (1.09) Depth: 14/46 02:15:41 2530715kN
>13.Bxe7!
> ± (1.38) Depth: 15/52 03:06:58 3912343kN
>13.Bxe7!
> +- (1.66) Depth: 16/51 05:32:30 7867274kN
>13.Bxe7!
> +- (1.94) Depth: 16/51 07:18:25 10701233kN
>
>(Silver, Private 23.02.2004)
Crafty 19.10 sticks with Nc7+ all the way past depth 15, with evaluations just
getting better
(edited output)
12 1:22 ++ 3. Nc7+!!
12-> 2:58 0.01 3. Nc7+ Kd8 4. Bxe7+ Kxc7 5. Qf4+ Kb6
6. Qd6+ Nc6 7. Qxc5+ Kc7 8. Qd6+ Kb6 9. Qc5+ (s=3)
13 3:34 ++ 3. Nc7+!!
13-> 20:45 0.55 3. Nc7+ Kf7 4. Qf4+ Kg8 5. Bxe7 d5
6. Qd6 Bc3 7. Ne8 Be1+ 8. Nxe1 Kf7
9. Nc7 Nd7 10. Nxa8 Re8
14 22:34 ++ 3. Nc7+!!
14-> 233:53 3.79 3. Nc7+ Kd8 4. Bxe7+ Kxc7 5. Qf4+ Kb6
6. Qd6+ Nc6 7. Qxc5+ Kc7 8. Bd6+ Kd8
9. Qg5+ Ke8 10. Bxg6+ hxg6 11. Qxg6+ Kd8
12. Qxg7 Qa1 13. Qxa1 Rh6 14. Bf4 Re6
15. Ng5 Nb4 16. Nxe6+ dxe6 17. Qd4+ Nd5
15 254:15 -- 3. Nc7+
15-> 823:51 3.92 3. Nc7+ Kd8 4. Bxe7+ Kxc7 5. Qf4+ Kb6
6. Qd6+ Nc6 7. Qxc5+ Kc7 8. Bd6+ Kd8
9. Qg5+ Ke8 10. Bxg6+ hxg6 11. Qxg6+ Kd8
12. Qxg7 Qa1 13. Qxa1 Rh6 14. Bf4 Re6
15. Ng5 a5 16. Qh8+ Ke7 17. Qg7+ Kd8
18. Nf7+ Ke8 (s=2)
Frank
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