Author: John Merlino
Date: 10:13:52 05/06/04
Go up one level in this thread
On May 06, 2004 at 09:54:28, Dan Ellwein wrote: >On May 05, 2004 at 22:37:31, John Merlino wrote: > >>On May 05, 2004 at 20:00:05, George Tsavdaris wrote: >> >>>On May 05, 2004 at 18:15:54, Vincent Lejeune wrote: >>> >>>>In the article "Tactics from the Russian Team Champ" on the chessbase site ( >>>>http://www.chessbase.com/newsdetail.asp?newsid=1625 ) >>>>We can see this position : >>>>[D]r1r3k1/3n1b2/p1qp3Q/1p2p2p/4P3/1PP1BP2/2P5/1K1R1B2 w - - 0 29 >>>>with the comment "29.Bxb5!! ...this clearance sacrifice."; In fact Bxb5 is only >>>>the third best move, Chessmaster 9000 confirms that with the 3 best moves mode : >>> >>> As all moves lead to mate, all moves are the best ones. So i don't think Bxb5 >>>deserves a (!!) but only a (!) . >>> Also the below analysis doesn't prove that Bxb5 is not a mate in 6 or 7 for >>>example, so it may be the quickest mate after all. >> >>I have determined with reasonable certainty, from a little bit of poking around >>with lines, that Bxb5 is at most a Mate in 14. There may be a Mate in 13 lurking >>around in there, but no less. >> >>>> >>>>Time Depth Score Positions Moves >>>>4:48 1/13 Mate07 127988483 29.Bh3 Nf6 30.Qxf6 Qe8 31.Bh6 Qf8 >>>> 32.Rg1+ Bg6 33.Qxg6+ Kh8 34.Bxf8 >>>> Rxf8 35.Qg7# >>>>4:54 1/13 Mate08 130793582 29.Bc4 Qxc4 30.Rg1+ Bg6 31.Rxg6+ >>>> Kf7 32.Rg7+ Ke8 33.bxc4 Rc7 34.Qxh5+ >>>> Kd8 35.Qh8+ Nf8 36.Qxf8# >>>>5:25 1/13 Mate15 145728017 29.Bxb5 Nf8 30.Rg1+ Bg6 31.Rxg6+ >>>> Nxg6 32.Qxg6+ Kh8 33.Bg5 d5 34.Bxc6 >>>> Rxc6 35.Qxc6 Rf8 36.Qh6+ Kg8 37.Qg6+ >>>> Kh8 38.Qxh5+ Kg8 39.Bh6 Kh7 40.Bxf8+ >>>> Kg8 41.Qh6 Kf7 42.Qg7+ Ke8 43.Qe7# >> >>jm > >Hi John > >CM9_OffSet finds a mate in 9 in 2 seconds, mate in 8 in 3 seconds, and a mate in >7 in 49 seconds... That's cool. But the point of George's post was that he was saying that Bxb5 might be the best move of all, as opposed to 3rd best according to the analysis above. My post was confirming that it is the 3rd best move. It still is winning, of course. And it is an excellent example of a clearance sacrifice, which was the point of the position. >btw... congrats on promotion to manager, sounds like yer doin' pretty good :) I'm trying. :-) Many thanks, jm
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