Computer Chess Club Archives




Subject: Re: Most brilliant novelty from cct7 Witchess-Arasan

Author: Uri Blass

Date: 08:40:12 02/14/05

Go up one level in this thread

On February 14, 2005 at 10:56:24, Vincent Diepeveen wrote:

>On February 14, 2005 at 10:33:12, Jon Dart wrote:
>>A few notes from Arasan's games in CCT7:
>>Game 1 against Homer, Arasan had Black in a QID that Schroer called
>>"a super high-class line, very theoretical". Arasan was in book until
>>move 18. It appears Homer misplayed the next few moves. Arasan's score
>>rapidly climbed and it won.
>>Arasan won easily against Alarm after it blundered here with .. Bxa3:
>>[D] 3q1b1k/1p4pp/rn2rp2/BR2p3/p3N3/P2PP1P1/5P1P/1QR3K1 b - - 0 1
>>Black is not in good shape already, but the pawn can't be taken.
>>Arasan lost against Fafis. The opening was some unusual variant of the
>>Four Knights .. Arasan was out of book at move 7. Arasan's score
>>was positive until move 45. I haven't analyzed this yet so I am
>>not sure where it went wrong but it lost rapidly after that.
>>This game against nullmover gave me some anxious moments. 7 .. Ne8
>>is unusual (..c6 is more common) and Arasan was out of book after
>>that. Black got what looked like a pretty scary k-side attack
>>in the KID. But Arasan defended - in fact its score was never
>>negative. Finally Arasan broke through on the q-side -- standard
>>play in the KID - and won. The nullmover author mentioned his program
>>had no passed pawn code and in general has a simple eval.
>>[Event "?"]
>>[Site ""]
>>[Date "2005.02.13"]
>>[Round "?"]
>>[White "Arasan 9.0"]
>>[Black "nullmover"]
>>[Result "1-0"]
>>[ECO "E87"]
>>[WhiteElo "2594"]
>>[BlackElo "2202"]
>>[TimeControl "3000+3"]
>>1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 Ne8
>>8. Qd2 f5 9. exf5 gxf5 10. Bd3 Na6 11. Nge2 Nb4 12. O-O f4 13. Bf2
>>Nxd3 14. Qxd3 Rf5 15. Ne4 Rh5 16. b4 Rh6 17. Rfe1 Rg6 18. Kh1 Nf6
>>19. N2c3 Nxe4 20. Nxe4 Bf5 21. Rg1 Kh8 22. a4 Qe7 23. c5 dxc5
>>24. bxc5 Rg8 25. d6 Qf7 26. Rad1 Rh6 27. Rge1 cxd6 28. cxd6 b6
>>29. Qd5 Be6 30. Qd2 Bf8 31. Qc3 Qg7 32. g4 Rh3 33. g5 Bg4 34. Rd3 Bf5
>>35. a5 Rh5 36. Rd5 Bxe4 37. Rxe5 Qf7 38. R5xe4+ Bg7 39. Qc6 Rxg5
>>40. Re8 Rg6 41. axb6 axb6 42. Bxb6 Qa2 43. Rxg8+ Kxg8 44. Re8+
>> 1-0 {nullmover resigns}
>>Against Pharaon, Arasan played a reasonable variant of the Slav and
>>was ok for a long time. Finally at this point Pharaon played Bh6:
>>[D] q6k/3r1p2/p4Pp1/1pRn3p/3PQ3/P6P/1P1B4/6K1 w - - 0 1
>>and then posted the Bishop on g7. Neither Arasan nor Crafty would play
>>Bh6 at the tournament time level on the hardware I have, but Crafty
>>does eventually fail high on it, with a score of +1.7, so this may
>>have been the decisive move.
>>I wasn't watching for a while, but the next time I looked Pharaon was up
>>a Knight--not quite sure how that happened, but seems like it found a
>>nice tactic.
>>Pharaon was strong even before its recent version update and now it
>>is really formidable.
>>In the Chompster game, 37 .. a4 by Chompster was a bad mistake,
>>gifting Arasan with an outside passer:
>>[D] 2q1r1k1/5pp1/5bp1/p7/4PQ2/1Br5/P4RPP/5R1K b - - 0 1
>>But the game got into a bishop of opposite colors ending and was
>>drawn. I actually made the draw manually, which brought a protest
>>from sfarrell: he is right that under the rules this should not
>>have been done without the TD's consent. It seems several programs
>>broke this rule in this round.
>>I was disappointed to lose the last game against cEng (witchess). It
>>had a very unusual opening:
>>[Event "?"]
>>[Site ""]
>>[Date "2005.02.13"]
>>[Round "?"]
>>[White "witchess"]
>>[Black "Arasan 9.0"]
>>[Result "1-0"]
>>[ECO "C28"]
>>[WhiteElo "2397"]
>>[BlackElo "2594"]
>>[TimeControl "3000+3"]
>>1. e4 e5 2. Nc3 Nf6 3. Bc4 Nc6 4. Nf3 Nxe4 5. Nxe4 d5 6. Bd3 dxe4
>>7. Bxe4 Ne7 8. c3 f5 9. Bc2 e4 10. Ne5 Qd5 11. f4 exf3 12. Nxf3 Qe6+
>>13. Kf2 Qb6+ 14. d4 Be6 15. Ba4+ c6 16. Re1 Bd5 17. Bb3 O-O-O 18. Bg5
>>Qc7 19. Bxd5 cxd5 20. Qe2 Qb6 21. c4 Rd7 22. cxd5 Kb8 23. Qe5+ Ka8
>>24. d6 Rxd6 25. Bxe7 Bxe7 26. Qxe7 Rc8 27. Kg1 Rg8 28. Rac1 Rdd8
>> 1-0 {ArasanX resigns}
>>I analyzed this overnight with Crafty but didn't find where Arasan
>>went wrong. I didn't like 7.. Ne7 and 7.. Bd6 seems to be better -
>>this has occurred in a few games with this line. After Ne7, Arasan
>>had its Bishop locked in and failed to develop it.
>I watched this game live and found it a very strong game from witchess.
>Especially because it plays without book. Let's be honest there. That's 700
>rating points (a real strong book).

How did you get that estimate?

Do you have one tournament when a program with no book performed 700 elo worse
than the same program with book?


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