Author: Joachim Rang
Date: 04:30:57 08/11/05
Go up one level in this thread
On August 10, 2005 at 10:12:05, George Tsavdaris wrote:
> One of the most difficult to analyse games i have ever seen. Analysing it with
>every other engine i see only black winning scores that lead to huge fail low
>that favour white at the end....This game has many testpositions but so deep
>that it's difficult for engines to find....The poor Chess Tiger 15.0 thought it
>was winning in almost all game long, and with big scores, until the end that
>realised the truth........:-)
>
> At move 18, XXX-9 played 18.g5!? (or !! or ? i don't know) giving a full Knight
>with no immediate material gain but showing a positive score. It was just a
>speculative sacrifice that i can't decide if it was correct or not. Then it
>played 21.Qh3! and showed a +2.38 score while other engines i tried believe that
>black is winning.
>
>Some testpositions occured analysing the game afterwards:
>
>White to play 24.Rde1! showing a win.[Medium]
>The 24th move of the game......
>[D]rnr3k1/1b2b1p1/p3p1Pp/2npq3/1p1N2B1/1P2B2Q/P1P4P/1K1R3R w - - 0 24
>
>
>White to play 25.Bf2!! showing a win.[Difficult(Easy to find, difficult to show
>a win)]
>Occurs after 24...Bf6! instead of the 24...Qf6?! played on the game.
>[D]rnr3k1/1b4p1/p3pbPp/2npq3/1p1N2B1/1P2B2Q/P1P4P/1K2R2R w - - 0 1
>
>
>White to play 23.Rhg1! showing a win.[Easy]
>Occurs after 21...hxg6 22.Kb1 Rf8.........
>[D]rn3rk1/1b2b1p1/p3p1p1/q1npP3/1p1N4/1P2BB1Q/P1P4P/1K1R3R w - - 0 23
>
>
>White to play 23.Rdg1! showing a win.[Easy]
>Occurs after 21...hxg6 22.Kb1 Rf8 23.Rhg1! Rf7 24.Rxg6 Qc7.........
>[D]rn4k1/1bq1brp1/p3p1R1/2npP3/1p1N4/1P2BB1Q/P1P4P/1K1R4 w - - 0 25
>
>
>White to play 25.Rhg1! showing a win.[Difficult]
>Occurs after 21...hxg6 22.Kb1 Nc6 23.Bg4! Nxe5 24.Bxe6 Nf7 (Nxe6 loses
>too)......
>[D]r1r3k1/1b2bnp1/p3B1p1/q1np4/1p1N4/1P2B2Q/P1P4P/1K1R3R w - - 0 25
>
>
>Bh6!! winning instantly.[Easy]
>[D]r1r3k1/1b3np1/p3BbR1/3p4/1p1Nn3/qP2B2Q/P1P4P/3RK3 w - - 0 30
>
>[Event "15'/40+15'/40+15'"]
>[Site "Thessaloniki"]
>[Date "2005.08.27"]
>[Round "?"]
>[White "XXX-9"]
>[Black "Chess Tiger 15.0"]
>[Result "1-0"]
>[ECO "B84"]
>[PlyCount "69"]
>[EventDate "2005.??.??"]
>[TimeControl "40/900:40/900:900"]
>
>{64MB, DFritz8.ctg, OEMComputer} 1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:02]} 2.
>Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:04]} 3. d4 {[%emt 0:00:00]} cxd4 {
>[%emt 0:00:08]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {
>[%emt 0:00:00]} e6 {[%emt 0:00:07]} 6. Be2 {[%emt 0:00:00]} a6 {[%emt 0:00:00]}
>7. f4 {[%emt 0:00:00]} Be7 {[%emt 0:00:04]} 8. Be3 {[%emt 0:00:00]} Qc7 {
>[%emt 0:00:00]} 9. Qd2 {[%emt 0:00:00]} O-O {[%emt 0:00:04]} 10. O-O-O {
>[%eval 21,14] [%emt 0:00:39]} b5 {[%emt 0:00:39]} 11. g4 {
>[%eval 11,16] [%emt 0:00:41]} Bb7 {[%emt 0:00:29]} 12. Bf3 {
>[%eval 24,16] [%emt 0:00:22]} b4 {[%emt 0:00:38]} 13. Na4 {
>[%eval 10,16] [%emt 0:00:25]} Qa5 {[%emt 0:00:19]} 14. b3 {
>[%eval 5,15] [%emt 0:00:11]} Rc8 {[%emt 0:01:25]} 15. Qg2 {
>[%eval 30,15] [%emt 0:00:12]} d5 {[%emt 0:00:44]} 16. e5 {
>[%eval 44,17] [%emt 0:00:31]} Ne4 {[%emt 0:00:24]} 17. f5 {
>[%eval 58,16] [%emt 0:00:23]} Nc5 {[%emt 0:00:33]} 18. g5 {
>[%eval 73,17] [%emt 0:00:58]} Nxa4 {[%emt 0:00:33]} 19. g6 {
>[%eval 44,16] [%emt 0:01:41]} fxg6 {[%emt 0:01:11]} 20. fxg6 {
>[%eval 101,13] [%emt 0:00:09]} Nc5 {[%emt 0:00:16]} 21. Qh3 {
>[%eval 238,15] [%emt 0:00:39]} h6 {[%emt 0:02:38]} 22. Kb1 {
>[%eval 202,12] [%emt 0:00:12]} Qc7 {[%emt 0:00:49]} 23. Bg4 {
>[%eval 204,13] [%emt 0:00:20]} Qxe5 {[%emt 0:00:29]} 24. Rde1 {
>[%eval 204,16] [%emt 0:00:42]} Qf6 {
>Loses instantly. Better is Bf6 that loses also after 25.Bf2!! [%emt 0:01:48]}
>25. Rhf1 {[%eval 362,15] [%emt 0:00:12]} Qxg6 {[%emt 0:00:08]} 26. Rg1 {
>[%eval 452,15] [%emt 0:00:53]} Bg5 {[%emt 0:01:09]} 27. Nxe6 {
>[%eval 464,15] [%emt 0:00:37]} Ne4 {[%emt 0:01:07]} 28. Bf5 {
>[%eval 449,18] [%emt 0:00:27]} Qf6 {[%emt 0:00:33]} 29. Bxg5 {
>[%eval 752,18] [%emt 0:00:26]} hxg5 {[%emt 0:02:23]} 30. Qh7+ {
>[%eval 783,16] [%emt 0:00:08]} Kf7 {[%emt 0:00:00]} 31. Nxg5+ {
>[%eval 749,16] [%emt 0:00:12]} Nxg5 {[%emt 0:00:54]} 32. Qh5+ {
>[%eval 813,15] [%emt 0:00:07]} Kf8 {[%emt 0:00:13]} 33. Qh8+ {
>[%eval 1137,16] [%emt 0:00:18]} Kf7 {[%emt 0:00:00]} 34. Bxc8 {
>[%eval 1224,14] [%emt 0:00:13]} Bc6 {[%emt 0:01:22]} 35. Rgf1 {
>[%eval 1226,14] [%emt 0:00:24]} 1-0
Yup a very interesting game. I'm not sure whether 21...hxg6 would have hold
though. Shredder 9 sees only perpetual for white after that move.
Most surprising Shredder 9 suggests 18.fxe6 instead of 18.g5?! with a big white
advantage.
11.g4? is unsound as other pointed out and refuted by 11...b4. Black could
easily have won later in the game with 14...Nxe4!.
regards Joachim
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