Author: Thom Perry
Date: 17:16:01 12/14/98
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On December 14, 1998 at 13:45:31, Laurence Chen wrote: >On December 14, 1998 at 13:21:02, F. Jermann wrote: > >>As you guessed: CS Tal is able to find the Real Sacrifice of Capablanca! On my >>old P200MMX, CS Tal needs 2988 s for a 11 ply search to find that Lh7: is the >>best move in the given position!!!! His evaluation is +1.80 for white. The next >>best Lc2 is about + 1.43. >> >>I used the last version available on Chris' server before CSBlack and CSWhite >>were presented! >> >>I think CS Tal has the best evaluation function, if you neglect the speed! >> >>So is this a proof for you that, in principal, chess programs can find >>intelligent R E A L S A C R I F I C E S ?????? >Thank you Jermann for your reply and confirming my guess. Real sacrifices are a >part of the arsenal of very few GM, the likes of Alekhine, Kasparov, Keres, Tal, >Shirov, Speelmann, these are the GM I know, so my apologies if I left any other >out. It is interesting to see that CS Tal is able to find the best move, and >because I don't have a copy of CS Tal, I would like to know if CS Tal is able to >find the continuation, that is after the moves: 12. Bxh7 Kxh7 13. Ng5+ Kg6 14. >Qg4 f5 15. Qg3 Kh6 16. Qh4+ Kg6 17. Qh7+ Kf6 the following position arises: >r1bq1r2/pp2n1pQ/4pk2/2n2pN1/8/2N1P3/PP3PPP/R4RK1 w - - 0 18 >the best move is 18. e4! which Capablanca played. My chess engines, CM 6000, >Fritz 5.16, Junior 5.0, Hiarcs 6, failed to find this move also. Another >sacrifice to open up the position. However, when I played the game out with the >best move 18. e4! it has been shown that White does indeed get enough >compensation for the piece sacrifice, and Black NEEDS TO FIND THE MOST ACCURATE >MOVES in order to save the game. I have completed the MCP8 analysis of the position after the 12. Bxh7+ sacrifice with a stunning result. MCP8 plays the defence aggressively, deviating from the above with 15. ... f4. As a result of this countersacrifice, white is forced to play for a quick draw by repetition or face the loss of more material. Here is the line of play: 12. ... Kxh7 13. Ng5+ Kg6 14. Qg4 f5 15. Qg3 f4 16. exf4 Nf5 17. Qg4 Nh6 18. Qg3 Nf5 19. Qg4 Nh6 20. Qg3 Nf5 and drawn by repetition! I am e-mailing the MCP8 analysis file to my work location so that I can post it in the morning (if anyone is interested). By then, someone or some other program may have refuted the MCP8 analysis. But as it stands now, it appears that the sacrifice worked because of the man and not because of the soundness of the sacrifice.
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