Author: Howard Exner
Date: 08:08:47 11/17/00
Go up one level in this thread
On November 17, 2000 at 04:26:58, Andrew Williams wrote: >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 agree after Qxg4 Rxh7, both Qe6 and Re6 for black look good. If so then the key position is to avoid Kxh7. Here is the diagram starting with Qxg4. [D]1rq1r1k1/5p1p/2p2b2/p6R/2Qp2P1/1P6/1P1B1P2/2KR4 b - - > >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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