Author: Jeremiah Penery
Date: 23:50:39 01/06/01
Go up one level in this thread
On January 05, 2001 at 23:45:44, Joshua Lee wrote: >Fritz6 - IM Nathanael Situru [D]4rrk1/1q4b1/p5p1/1pPP1p1p/4p1n1/1P4N1/P3QBPP/1R1R2K1 b - - 0 1 >e3! is the move to find but it takes so long as you can see. I have seen only 1 >other position take longer and that was Nolot 5 that i solved. Are there any >that are more difficult? nolot 5 took over 20 hours (19/50ply). besides this Some of the other Nolot problems are quite a bit harder. Nolot #6 and #7 are extremely hard. #9 is probably the hardest for a computer, but it's not clear whether the solution move is really the best move. Position #6 [D]rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b kq - Malaniouk - Ivantchouk, Moscow 1988 13. ...axb5!! 14. Qxa8 Bd4 15. Nxd4 cxd4 16. Qxb8 0-0! 17. Ke1 Qh4 18. g3 Qf6 19. Bf4 g5? 19. ...Bf5!! 19. ...d3! 20. Rc1 exf4 21. Qxf4 Qd4 22. Rd1 bxc4 23. e5 Qc3+ 24. Rd2 Re8 25. Bxd3 cxd3 -+ An interesting line is instead of playing 17. Ke1 as in the game, playing 17. c5!?. Black's attack looks menacing, but there is no obvious win. 13. ...axb5!! seems clearly the best move in the position, even though Ivanchuk did not see all the complications over the board, and we [DT team] cannot establish that it necessarily wins. It probably would tie down the machine for a few days to find the move. Perhaps we will try it sometime later. Position #7 [D]1r1bk2r/2R2ppp/p3p3/1b2P2q/4QP2/4N3/1B4PP/3R2K1 w k - Todorovic - Tosic, Arandjelovac, 1993. 1. Rxd8+!! Rxd8 1. ...Kxd8 2. Ra7! Qe2 3. Qd4+ Ke8 4. h3 Qe1+ 5. Kh2 Rd8 6. Qc5 Qh4 7. Ba3 Rd7 8. Ra8+ Rd8 9. g3 1-0 2. Ba3 Qe2 3. h3! Bd7 3. ...Qe1+ 4. Kh2 Qa5 5. Re7+ Kf8 6. Rd7+ Kg8 7. Bb4 Rxd7 8. Bxa5 +- 4. Nf5! Qd1+ 5. Kh2 f6 6. exf6 1-0 Position #9 [D]r4r1k/4bppb/2n1p2p/p1n1P3/1p1p1BNP/3P1NP1/qP2QPB1/2RR2K1 w - - Weinstein - Elyoseph, Israel 1992 1. Ng5!! hxg5 2. hxg5! Rac8 3. Nf6!! Nb8 3. ...gxf6 4. gxf6 Rfe8 5. Qh5 Kg8 6. Rxc5! Bg6! 7. Qh4 Bxc5 8. Be4 Ne7 9. Kg2 Qd5 10. Bxd5 +- 4. Qh5 Bxf6 5. gxf6 gxf6 6. Rxc5 Rxc5 7. Be4 f5 8. Kg2 Rg8 9. Rh1 Rg7 10. Bh6 Nd7 11. Bxg7+ Kxg7 12. Qxh7+ This one is rather unclear.
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