Author: Andrew Williams
Date: 01:26:58 11/17/00
Go up one level in this thread
On November 16, 2000 at 23:49:37, Jon Dart wrote: >I've been taking a close look at the following game, where >Arasan went down in a sudden tactical defeat to Postmodernist. > >[Event "?"] >[Site "?"] >[Date "2000.11.14"] >[Round "?"] >[White "PostModernist"] >[Black "Arasan 6.0"] >[Result "1-0"] >[ECO "C24"] >[WhiteElo "2451"] >[BlackElo "2505"] >[TimeControl "1200+5"] > >1. e4 e5 2. Bc4 Nf6 3. d3 d6 4. Nc3 g6 5. Nf3 Bg7 6. Be3 c6 7. d4 >exd4 8. Qxd4 O-O 9. O-O-O Nd5 10. e5 Nxc3 11. Qxc3 d5 12. Bb3 Bf5 >13. h4 Bg4 14. Qb4 Qc8 15. Qf4 Bxf3 16. Qxf3 a5 17. Qf4 b5 18. a4 >bxa4 19. Qxa4 Bxe5 20. Rhe1 Nd7 21. h5 gxh5 22. g4 h4 23. Rh1 Rb8 >24. Rxh4 d4 25. Bh6 Nc5 26. Qc4 Nxb3+ 27. cxb3 Re8 28. Rh5 Bf6 >29. Bd2 Qxg4 30. Rxh7 Kxh7 31. Qxf7+ Kh8 32. Rh1+ Bh4 33. Bf4 Re7 >34. Qxe7 Qxf4+ 35. Kb1 Qf5+ 36. Ka2 Rf8 37. Qxh4+ Kg8 38. Rg1+ Kf7 >39. Qxd4 Ke8 1-0 > >It looks to me like Black should avoid 29 .. Qxg4. Analysis by >Crafty agrees: Crafty eventually switches to Qe6, but it takes >a *long* time. And after 30 minutes it still thinks both moves >have a positive score, so it doesn't see a storm coming .. yet. > Hi Jon, An interesting game. I don't think PM had a very clear idea what was going on. Its score for 30. Rxh7 is -1.27. It expected 30...Qe6 in response. Thereafter its scores went -1.14, -1.00 then +0.07 after 33.Bf4 and +1.69 after 34. Qxe7 I can email you PM's epd output for the game if you like. Cheers Andrew >Note that 30. Rxh7+ is only a temporary sacrifice: White both >gets his material back and gets the attack, too. My guess is >that both Crafty and Arasan don't easily see the material >coming back. I do a lot of forward pruning and I think a lot >of the lines after Rxh7+ are getting chopped. Plus there are >a lots of checks once the two queens are on the open board, >so there might be some extension blowup too. > >At move 31, Arasan's score goes negative after 12 plies and >at 15 plies hits -0.73, so it is getting a good whif of danger, >although not enough to switch to an alternative move. It still >doesn't think it's lost but it might already be at this point. > >--Jon
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