Author: Uri Blass
Date: 06:04:08 10/31/01
Go up one level in this thread
On October 31, 2001 at 08:25:23, Terry McCracken wrote: >On October 31, 2001 at 07:08:43, Uri Blass wrote: > >>On October 31, 2001 at 03:28:12, Terry McCracken wrote: >> >>>On October 30, 2001 at 19:49:30, John Merlino wrote: >>> >>>>On October 30, 2001 at 18:24:41, Terry McCracken wrote: >>>> >>>>>[D]r5k1/ppp2r1p/3p3b/3Pn3/1n2PPp1/1P2K1P1/PBB1N2q/R2Q3R B >>>>> >>>>> >>>>>How do your programmes evaluate this position? >>>>>Do they find forced mate? >>>>> >>>>>Terry >>>> >>>>CM8000 does not find the mate in under 10 minutes on my PIII-600. It sees: >>>> >>>>1...Rxf4 2.Rxh2 Rf3+ 3.Kd4 c5+ 4.dxc6ep b5 5.Bd3 Nexc6+ 6.Kc3 Bg7+ 7.Kd2 Rxd3+ >>>>8.Ke1 >>>> >>>>with an eval of -1.79. Is this the right line, and CM just hasn't seen far >>>>enough yet? Is there really a forced mate? >>>> >>>Yes it is! Fritz with help finds a mate in 14, it was shorter in the >>>actual game. >>> >>>I did this quickly so a shorter mate may exist? >>> >>> >>>1...Rf4! 2.Rxh2..Rf3+ 3.Kd4..Bg7!!4.Rxh7 >> >>I do not understand Rxh7 >>why not Ng1? > >Rxh7 is a computer move to delay mate. Ng1 and the mate come a couple >moves sooner. No Ng1 is the computer move and after Rxh7 programs can see a clear advantage for black. New position r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 w - - 0 1 Analysis by Deep Fritz: 4.Rxh7-- +- (7.44) Depth: 1/5 00:00:00 4.Rxh7-- Kxh7 +- (3.53) Depth: 1/9 00:00:00 4.Nf4! +- (3.56) Depth: 1/19 00:00:00 4.Nf4! c5+ 5.dxc6 +- (4.44) Depth: 1/20 00:00:00 1kN 4.a3! +- (4.47) Depth: 1/20 00:00:00 1kN 4.a3! c5+ 5.dxc6 +- (4.75) Depth: 1/20 00:00:00 2kN 4.Nc3! +- (4.84) Depth: 1/20 00:00:00 2kN 4.Nc3! Rxg3 +- (6.66) Depth: 1/20 00:00:00 2kN 4.Bc3! +- (6.75) Depth: 1/20 00:00:00 2kN 4.Bc3! c5+ 5.dxc6 +- (7.03) Depth: 1/20 00:00:00 3kN 4.Bc3 c5+ 5.dxc6 Nxc2+ 6.Qxc2 +- (7.03) Depth: 2/12 00:00:00 3kN 4.Bc3-- +- (6.56) Depth: 3/16 00:00:00 4kN 4.Bc3-- Rf1 5.Ke3 Rxd1 +- (3.97) Depth: 3/17 00:00:00 8kN 4.Qd2! +- (4.00) Depth: 3/19 00:00:00 22kN 4.Qd2! c5+ 5.dxc6 Nexc6+ 6.Kc4 Bxb2 +- (4.25) Depth: 3/19 00:00:00 23kN 4.Qd2-- +- (3.94) Depth: 4/20 00:00:00 25kN 4.Qd2-- b5 5.Qxb4 Nc6# -+ (-#2) Depth: 4/20 00:00:00 32kN 4.Bc3! -+ (-#3) Depth: 4/20 00:00:00 39kN 4.Nc1! -+ (-11.72) Depth: 4/20 00:00:00 65kN 4.Nc1! Ned3+ 5.Kc4 Nxb2+ 6.Kxb4 Bc3+ 7.Ka3 Nxd1 µ (-1.19) Depth: 4/20 00:00:00 71kN 4.Ng1! µ (-1.16) Depth: 4/20 00:00:00 81kN 4.Ng1! Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 ± (0.88) Depth: 4/20 00:00:00 93kN 4.Rxh7! ± (0.91) Depth: 4/20 00:00:00 99kN 4.Rxh7! Kxh7 5.Bc3 c5+ 6.dxc6 Nexc6+ 7.Kc4 +- (3.28) Depth: 4/20 00:00:00 104kN 4.Rxh7-- +- (2.97) Depth: 5/19 00:00:00 117kN 4.Rxh7-- b5 5.Rxg7+ Kxg7 6.Bd3 Rxd3+ 7.Qxd3 = (0.13) Depth: 5/21 00:00:00 134kN 4.Nf4! = (0.16) Depth: 5/26 00:00:00 274kN 4.Nf4! b5 5.Qxf3 Nxf3+ = (0.25) Depth: 5/26 00:00:00 302kN 4.Ng1! ² (0.28) Depth: 5/26 00:00:00 338kN 4.Ng1! Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 ± (0.88) Depth: 5/26 00:00:00 348kN 4.Ng1 Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 9.Rxd1 ± (0.88) Depth: 6/26 00:00:00 439kN 4.Ng1 Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 a5+ 8.Kb5 Nxd1 9.Rxd1 ± (0.88) Depth: 7/28 00:00:01 937kN 4.Ng1-- ² (0.56) Depth: 8/32 00:00:01 1499kN 4.Ng1-- c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nc4+ = (0.00) Depth: 8/32 00:00:02 1844kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nc4+ = (0.00) Depth: 9/34 00:00:05 4437kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nc4+ = (0.00) Depth: 10/32 00:00:11 10055kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nxd1 = (-0.25) Depth: 11/36 00:00:30 26824kN 4.Ng1 Rxg3 5.Ne2 Rf3 6.Ng1 c5+ 7.dxc6 Ned3+ 8.Kc4 b5+ 9.Kxb5 Rb8+ = (-0.22) Depth: 12/37 00:02:04 103964kN (Blass, Tel-aviv 31.10.2001) New position r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 w - - 0 1 Analysis by Crafty 18.12: 4.a3 +- (9.13) Depth: 1/6 00:00:00 4.a3 c5+ 5.dxc6 Nexc6+ 6.Kc4 Bxb2 7.axb4 Bxa1 8.Qxa1 +- (5.65) Depth: 2/6 00:00:00 4.Bc3 Nxc2+ 5.Qxc2 Rd3+ 6.Qxd3 Nxd3+ 7.Kxd3 Bxc3 8.Nxc3 +- (7.63) Depth: 2/6 00:00:00 4.Bc3 c5+ 5.dxc6 Nexc6+ 6.Kc4 b5+ 7.Kxb5 Bxc3 8.Nxc3 Rxc3 9.Qxg4+ +- (6.77) Depth: 3/14 00:00:00 4.Bc3 Rf1 5.Ke3 Rxd1 6.Bxd1 +- (6.15) Depth: 4/17 00:00:00 4.Bc3 c5+ 5.dxc6 bxc6 6.Bxb4 Nd3+ 7.e5 Bxe5+ 8.Ke4 d5# -+ (-#5) Depth: 5/19 00:00:01 4.a4 c5+ 5.dxc6 bxc6 6.Bd3 c5+ 7.Kc3 Rxd3+ 8.Qxd3 Nexd3+ 9.Kd2 Bxb2 10.Rf1 -+ (-3.82) Depth: 5/19 00:00:01 4.Rh5 Ned3+ 5.Kc4 Nxb2+ 6.Kxb4 a5+ 7.Kb5 Nxd1 8.Rxd1 +- (3.33) Depth: 5/19 00:00:01 4.Bc1 c5+ 5.dxc6 bxc6 6.Be3 Ned3+ 7.Kc4 d5+ 8.exd5 cxd5+ 9.Kb5 Rxe3 10.Bxd3 Nxd3 +- (3.46) Depth: 5/19 00:00:02 4.Bc1 b5 5.Rb1 Nec6# -+ (-#2) Depth: 6/24 00:00:04 2022kN 4.a4 c5+ 5.dxc6 bxc6 6.Bd3 c5+ 7.Kc3 Rxd3+ 8.Qxd3 Nexd3+ 9.Kd2 Nxb2 10.Rf1 N2d3 -+ (-3.52) Depth: 6/24 00:00:05 2434kN 4.Rxh7 c5+ 5.dxc6 bxc6 6.Rxg7+ Kxg7 7.Bd3 Rxd3+ 8.Qxd3 Nbxd3 9.Ba3 Rd8 ³ (-0.55) Depth: 6/24 00:00:06 3009kN 4.Ng1 Ned3+ 5.e5 Bxe5+ 6.Kc4 Nxb2+ 7.Kxb4 Bc3+ 8.Ka3 Nxd1 9.Rxd1 +- (2.09) Depth: 6/24 00:00:08 3962kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.Kc4 b5+ 7.Kxb5 Rb8+ 8.Ka4 Nxb2+ 9.Ka3 Nc4+ 10.Ka4 Nb2+ = (0.00) Depth: 7/26 00:00:10 5108kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.e5 Bxe5+ 7.Kc4 b5+ 8.Kxb5 Rb8+ 9.Ka4 Nxb2+ 10.Ka3 Nc4+ 11.Ka4 Nb2+ = (0.00) Depth: 8/29 00:00:18 9300kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.e5 Bxe5+ 7.Kc4 b5+ 8.Kxb5 Rb8+ 9.Ka4 Nxb2+ 10.Ka3 Nc4+ 11.Ka4 Nb2+ = (0.00) Depth: 9/29 00:00:31 16576kN 4.Ng1 c5+ 5.dxc6 Ned3+ 6.e5 Bxe5+ 7.Kc4 b5+ 8.Kxb5 Rb8+ 9.Ka4 Nxb2+ 10.Ka3 Nc4+ 11.Ka4 Nb2+ = (0.00) Depth: 10/33 00:01:10 37379kN (Blass, Tel-aviv 31.10.2001) Uri
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