Author: John Merlino
Date: 12:40:29 12/17/02
Go up one level in this thread
On December 17, 2002 at 09:20:06, Art Basham wrote: >White can still win..by >1. Rxg7...etc. > >[D]3r1n1k/pbq1rpp1/1p2p2p/2p1P2Q/3PN1R1/1PPR4/P4PPP/6K1 w - - 0 1 > >Not sure about how many moves to a mate! CM9000, on a P3-733, does not announce a mate from the original position in less than ten minutes, but it finds Rxg7 (which should be easy for any program) in less than one second: Time Depth Score Positions Moves 0:00 1/3 -1.86 2594 1.Nd6 Nh7 2.Rdg3 f5 0:00 1/4 -1.66 11321 1.Nd6 Ba6 2.Rf3 Ng6 3.Nxf7+ Rxf7 4.Qxg6 Rxf3 5.gxf3 cxd4 6.cxd4 0:00 1/4 0.67 21507 1.Rxg7 Kxg7 2.Rh3 f5 3.exf6ep+ Kg8 4.fxe7 Qxe7 5.Rg3+ Kh7 6.Ng5+ Kg8 7.Qxh6 0:00 1/5 0.79 36639 1.Rxg7 Kxg7 2.Rh3 f6 3.exf6+ Kh8 4.fxe7 Qxe7 5.Qxh6+ Nh7 6.Nf6 0:01 1/6 3.05 73833 1.Rxg7 Kxg7 2.Rh3 f6 3.exf6+ Kg8 4.fxe7 Qxe7 5.Rg3+ Kh7 6.Ng5+ Kg7 7.Nf7+ Kf6 8.Nxd8 Qxd8 9.Qxh6+ Ke7 0:02 1/7 3.26 168481 1.Rxg7 Kxg7 2.Rh3 f6 3.exf6+ Kh8 4.fxe7 Qxe7 5.Qxh6+ Nh7 6.Nf6 Be4 7.Nxe4 cxd4 8.Qf6+ Qxf6 9.Nxf6 0:03 1/8 3.26 321382 1.Rxg7 Kxg7 2.Rh3 f6 3.exf6+ Kh8 4.fxe7 Qxe7 5.Qxh6+ Nh7 6.Nf6 Be4 7.Nxe4 cxd4 8.Qf6+ Qxf6 9.Nxf6 0:07 1/9 6.43 746877 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6 Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 0:14 1/10 6.88 1500541 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6 Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc6 10.Qxe6+ Kb5 11.Rxd8 Qxd8 0:32 2/11 7.68 3736388 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6 Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 12.Qd6+ Kc8 13.Qxd8+ Kxd8 2:27 3/12 8.34 18145729 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6 Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 12.Qd6+ Qc7 13.f7 Qxd6 14.Nxd6 7:50 4/13 10.97 58604447 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6 Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 12.Qd6+ Qxd6 13.Nxd6 Bd5 14.f7 Bxf7 15.Nxf7 cxd4 16.cxd4 After forcing the first several forced moves, 1.Rxg7 Kxg7 2.Rh3 f6 3.Qxh6+ Kf7 4.Qh5+ Ng6 5.Qh7+ Kf8 6.Qxg6, Black now has the option of 6...Rh7 or 6...Rf7. And, even in this position: [D]3r1k2/pbq1r3/1p2ppQ1/2p1P3/3PN3/1PP4R/P4PPP/6K1 b - - 0 6 CM cannot find a mate in a reasonable amount of time: Time Depth Score Positions Moves 0:00 1/3 6.50 3221 6...Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 0:00 1/4 6.50 9861 6...Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 0:00 1/5 6.61 39477 6...Rf7 7.Rh8+ Ke7 8.exf6+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 12.Qd6+ Kc8 13.Qxd8+ Kxd8 0:01 1/6 6.97 121149 6...Rf7 7.Nd6 fxe5 8.Rh8+ Ke7 9.Qxf7+ Kxd6 10.dxe5+ Kc6 11.Qxe6+ Rd6 12.exd6 Qxd6 13.Qxd6+ Kxd6 14.Rh7 0:03 1/7 7.43 344478 6...Rf7 7.Nd6 Qxd6 8.exd6 Rxd6 9.Rh8+ Ke7 10.Rh7 Rxh7 11.Qxh7+ Ke8 12.Qxb7 cxd4 13.Qc8+ Ke7 0:07 1/8 10.08 764432 6...Rf7 7.exf6 Ke8 8.Rh8+ Kd7 9.Qxf7+ Kc8 10.Qxe6+ Kb8 11.Rxd8+ Qxd8 12.Qd6+ Qxd6 13.Nxd6 Bd5 14.f7 Bxf7 15.Nxf7 cxd4 16.cxd4 0:14 1/9 14.54 1689809 6...Rf7 7.exf6 Ke8 8.Rh8+ Kd7 9.Qxf7+ Kc6 10.Qxe6+ Kb5 11.Rxd8 Bxe4 12.Rc8 Qxc8 13.Qxc8 Bg6 14.a4+ Ka5 15.dxc5 0:22 1/9 12.35 2486850 6...Rh7 7.Rxh7 Qxh7 8.Qxh7 Bxe4 9.Qh8+ Kf7 10.Qxd8 fxe5 11.Qc7+ Ke8 12.Qxe5 Bf5 13.Qb8+ Kd7 14.dxc5 0:34 2/10 14.35 3910185 6...Rh7 7.Rxh7 Qxh7 8.Qxh7 Bxe4 9.Qh8+ Kf7 10.Qxf6+ Ke8 11.Qxe6+ Kf8 12.Qf6+ Ke8 13.e6 Rd7 14.exd7+ Kxd7 15.Qf7+ Kd8 16.Qxa7 cxd4 17.Qxb6+ Ke8 18.Qxd4 1:16 3/11 14.35 9010393 6...Rh7 7.Rxh7 Qxh7 8.Qxh7 Bxe4 9.Qh8+ Kf7 10.Qxf6+ Ke8 11.Qxe6+ Kf8 12.Qf6+ Ke8 13.e6 Rd7 14.exd7+ Kxd7 15.Qf7+ Kd8 16.Qxa7 Ke8 17.Qxb6 cxd4 18.Qxd4 3:21 4/12 14.38 24421591 6...Rh7 7.Rxh7 Qxh7 8.Qxh7 Bxe4 9.Qh8+ Kf7 10.Qxf6+ Ke8 11.Qxe6+ Kf8 12.Qf6+ Ke8 13.e6 Rd7 14.exd7+ Kxd7 15.Qf7+ Kd8 16.Qxa7 cxd4 17.Qxb6+ Ke7 18.Qxd4 10:55 5/13 15.24 79516270 6...Rh7 7.Rxh7 Qxh7 8.Qxh7 Bxe4 9.Qh8+ Kf7 10.Qxf6+ Kg8 11.Qxd8+ Kf7 12.Qf6+ Ke8 13.Qxe6+ Kd8 14.dxc5 bxc5 15.Qd6+ Kc8 16.Qxc5+ Kb8 17.Qb4+ Bb7 18.Qf8+ Kc7 19.f4 However, White also has the option of 3.exf6+, leaving Black the option of 3...Kh8 or 3...Kg8. So, I think this position has way too many options for a comp to find a forced mate in a reasonable amount of time. Possibly overnight with a fast CPU? jm
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