Author: Robert Hyatt
Date: 06:44:46 03/12/00
Go up one level in this thread
On March 12, 2000 at 03:36:50, blass uri wrote:
>On March 12, 2000 at 02:19:03, Chessfun wrote:
>
>>
>>In this game Zarkov asked 3 times if I wanted to take back Fritz
>>move as it wasn't the best.
>>
>>This was after moves: 10....Na4 17....Bd7 19.....Kd8
>>
>>Fritz just don't consider 18. e6 which is the winning move.
>>
>>Fritz at move 23.....saw a mate in 19 therefore sacking the queen.
>>
>>[Event "Easter Tourney"]
>>[Site "Scarb"]
>>[Date "2000.03.12"]
>>[Round "1"]
>>[White "Zarkov 5"]
>>[Black "Fritz 6a"]
>>[Result "1-0"]
>>[PlyCount "57"]
>>
>>1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 cxd4 5. Bc4 Qc7 6. Qe2 Nb6 7. Bd3 Nc6 8.
>>Nf3 d5 9. h3 a6 10. Bf4 Na4 11. cxd4 Nb4 12. O-O Nxd3 13. Qxd3 Nxb2 14. Qb3
>>Nc4 15. Nbd2 b5 16. a4 Rb8 17. Rfc1 Bd7 18. e6 Qxf4 19. exd7+ Kd8 20. axb5
>>axb5 21. Ne5 Nxe5 22. dxe5 Qxd2 23. Qa3 Qe1+ 24. Rxe1 Kxd7 25. Qc5 d4 26.
>>Qxd4+ Ke8 27. Red1 f6 28. e6 b4 29. Qd7+ 1-0
>>
>>This analysis of F6 for Whites 18th move:
>>
>>Zarkov 5 - Fritz 6a
>>[D]1r2kb1r/2qbpppp/p7/1p1pP3/P1nP1B2/1Q3N1P/3N1PP1/R1R3K1 w k - 0 1
>>
>>Analysis by Fritz 6:
>>18.Rab1 Rc8 19.axb5 Bxb5 20.Nxc4 Bxc4 21.Qc3 e6 22.Nd2 Be7
>> ³ (-0.62) Depth: 8/23 00:00:02 767kN
>>18.axb5
>> ³ (-0.59) Depth: 8/23 00:00:03 826kN
>>18.axb5 axb5 19.Rab1 Ra8 20.Ra1 Rxa1 21.Rxa1 Bc6 22.Nxc4 dxc4
>> ³ (-0.56) Depth: 8/24 00:00:03 988kN
>>18.axb5 axb5 19.Rab1 Bf5 20.Nxc4 dxc4 21.Rxc4 Qd8 22.Rb2 Be6
>> ³ (-0.62) Depth: 9/25 00:00:06 1692kN
>>18.axb5 axb5 19.Rab1 Bf5 20.Rb2 Qb7 21.Nxc4 dxc4 22.Rxc4 Be6
>> ³ (-0.56) Depth: 10/30 00:00:14 4213kN
>>18.axb5 axb5 19.Rab1 Bf5 20.Rb2 Qb7 21.Ra2 Rc8 22.Nh4 Nxd2
>> ³ (-0.62) Depth: 11/32 00:00:46 13072kN
>>18.axb5 Bxb5 19.Nxc4 dxc4 20.Qc3 e6 21.Bg5 Qd7 22.Rcb1 h6
>> ³ (-0.47) Depth: 12/33 00:03:27 58939kN
>>18.e6
>> ³ (-0.44) Depth: 12/33 00:03:44 64214kN
>>18.e6 Qxf4 19.exd7+ Kd8 20.axb5 axb5
>> ³ (-0.37) Depth: 12/37 00:03:56 67685kN
>>
>>(Bird, Scarb 12.03.2000)
>>
>>So it sees it after 3:27 but prior to Bd7 when it needed
>>to see it who knows how long?.
>
>Fritz6light on p200MMX can find e6 after 45 seconds at depth 10.
>
>It seems that there is some weong evaluation change from Fritz6light to Fritz6.
>Finding e6 is a good positional test for chess programs.
>
>I say positional because programs usually find e6 before they find a tactical
>win.
>
>>Zarkov 5 sees it after 2081 nodes less than 1 second.
>
>Thanks.
>It seems that zarkov5 has better evaluation function.
>What is the evaluation of zarkov5?
>
>Uri
It would seem that fritz doesn't like e6 on positional grounds. This is what I
get:
4. Ra1
7 0.95 -0.75 1. Rab1 Rd8 2. axb5 axb5 3. Nxc4 dxc4
4. e6 Qxf4 5. exd7+ Rxd7 6. Qxb5
(3) 7-> 2.07 -0.75 1. Rab1 Rd8 2. axb5 axb5 3. Nxc4 dxc4
4. e6 Qxf4 5. exd7+ Rxd7 6. Qxb5
(2) 8 2.48 -0.75 1. Rab1 Rd8 2. axb5 axb5 3. Nxc4 dxc4
4. e6 Qxf4 5. exd7+ Rxd7 6. Qxb5
8 3.44 -0.66 1. axb5 Bxb5 2. Rab1 Rc8 3. Ng5 e6
4. Qf3 h6 5. Nxc4 dxc4
8 4.07 -0.56 1. e6 Qxf4 2. exd7+ Kxd7 3. axb5 axb5
4. Ne5+ Ke6 5. Ndxc4 dxc4 6. Ra6+ Kf5
7. Rxc4 bxc4 8. Qxb8
(4) 8-> 4.46 -0.56 1. e6 Qxf4 2. exd7+ Kxd7 3. axb5 axb5
4. Ne5+ Ke6 5. Ndxc4 dxc4 6. Ra6+ Kf5
7. Rxc4 bxc4 8. Qxb8
(3) 9 5.66 -0.63 1. e6 Qxf4 2. exd7+ Kd8 3. Qa2 Kxd7
4. axb5 axb5 5. g3 Qd6 6. Nb3
(4) 9-> 9.90 -0.63 1. e6 Qxf4 2. exd7+ Kd8 3. Qa2 Kxd7
4. axb5 axb5 5. g3 Qd6 6. Nb3
(3) 10 14.16 -0.45 1. e6 Qxf4 2. exd7+ Kxd7 3. axb5 axb5
4. Ne5+ Ke6 5. Ndxc4 dxc4 6. Ra6+ Kd5
7. Qc3 Ke4 8. Re1+ Kf5 9. Nxf7
(3) 10-> 22.02 -0.45 1. e6 Qxf4 2. exd7+ Kxd7 3. axb5 axb5
4. Ne5+ Ke6 5. Ndxc4 dxc4 6. Ra6+ Kd5
7. Qc3 Ke4 8. Re1+ Kf5 9. Nxf7
11 24.06 ++ 1. e6!!
(2) 11 31.95 0.17 1. e6 Qxf4 2. exd7+ Kd8 3. axb5 axb5
4. g3 Qd6 5. Ra7 Qh6 6. Qc3 b4 7. Qc2
Nxd2 8. Nxd2 Qxh3
11-> 42.90 0.17 1. e6 Qxf4 2. exd7+ Kd8 3. axb5 axb5
4. g3 Qd6 5. Ra7 Qh6 6. Qc3 b4 7. Qc2
Nxd2 8. Nxd2 Qxh3
12 53.88 ++ 1. e6!!
12-> 1:13 0.56 1. e6 Qxf4 2. exd7+ Kd8 3. axb5 axb5
4. g3 Qd6 5. Ra7 Qh6 6. Qc3 b4 7. Qc2
Nxd2 8. Nxd2 Qxh3
etc. Seems that e6 becomes tactically strong (for me) at depth=12. Prior
to that it is up to the eval to like it... Whether liking e6 on positional
grounds is good is another subject, of course...
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