Author: Pete R.
Date: 13:31:12 06/02/00
Go up one level in this thread
On June 02, 2000 at 08:32:31, blass uri wrote: >This position is from the game tal2.03-Junior6a > >[D]r2qr3/pb3pk1/np3b1N/2pp3Q/3P4/1PR1P1P1/P4PBP/5RK1 w - - 0 1 > >1)How much time does your program need to find 1.g4? > >2)How much time does your program need to avoid 1.g4? > >1.g4 is probably not the best move because of the line 1.g4 Rh8 2.Qxf7+ Kxh6 >3.f4 Rg8 4.Qxb7 Nb4 5.g5+ Bxg5 6.fxg5+ Qxg5 7.Rf2 Raf8 8.Qd7 Rxf2 > >Uri I have not analyzed the lines myself to determine the best move, but here is the output from Fritz 5.32, followed by my comments: New position r2qr3/pb3pk1/np3b1N/2pp3Q/3P4/1PR1P1P1/P4PBP/5RK1 w - - 0 1 Analysis by Fritz 5.32: -+ (-2.94) 1.dxc5 Bxc3 2.Nxf7 00:00:00 = (-0.25) 1.Nxf7 00:00:00 ² (0.31) 1.Nxf7 00:00:00 = (0.25) 1.Nxf7 Qe7 00:00:00 ³ (-0.47) 1.Nxf7 Qe7 2.Ne5 00:00:00 ³ (-0.44) 1.Rfc1 00:00:00 ³ (-0.41) 1.Rfc1 Qd7 2.Nf5+ Kg8 00:00:00 ³ (-0.37) 1.Rd3 00:00:00 ³ (-0.34) 1.Rd3 Qd7 2.dxc5 Nxc5 3.Nf5+ Kg8 00:00:00 ³ (-0.31) 1.Qxf7+ 00:00:00 ² (0.50) 1.Qxf7+ Kxh6 2.Qxb7 Nb4 00:00:00 = (0.06) 1.Qxf7+ Kxh6 2.Qxb7 Nb4 3.a3 00:00:00 = (0.09) 1.Nxf7 00:00:00 ² (0.44) 1.Nxf7 Qd7 2.Ne5 Bxe5 00:00:00 ² (0.53) 1.Nxf7 Qe7 2.Nh6 Rh8 3.Nf5+ Kf8 00:00:00 ² (0.56) 1.Nxf7 Qd7 2.Nh6 Kf8 3.Nf5 Rac8 00:00:00 ² (0.47) 1.Nxf7 Qe7 2.Nh6 Bc8 3.Qxd5 Nc7 4.Nf5+ Bxf5 5.Qxf5 cxd4 00:00:00 ² (0.69) 1.Nxf7 Qc7 2.Nh6 Rf8 3.Nf5+ Kg8 4.f4 Rae8 5.Nh6+ Kg7 00:00:03 ± (0.75) 1.Nxf7 Qc7 2.Nh6 Rh8 3.Nf5+ Kf8 4.Qg6 Bg7 5.Rd1 Rd8 00:00:08 ² (0.69) 1.Nxf7 Qc7 2.Nh6 Rad8 3.Nf5+ Kf8 4.a3 Qf7 5.Qxf7+ Kxf7 00:00:25 ± (0.81) 1.Nxf7 Qc7 2.Nh6 Rh8 3.Nf5+ Kf8 4.Qg6 Bg7 5.Bxd5 Bxd5 00:01:28 ± (0.81) 1.Nxf7 Qc7 2.Nh6 Rf8 3.g4 Kh8 4.Nf7+ Kg8 5.Qg6+ Bg7 00:03:50 ± (0.84) 1.g4 00:28:15 ± (1.06) 1.g4 Rh8 2.Qxf7+ Kxh6 3.f4 Rg8 4.g5+ Bxg5 5.Qxb7 Nc7 01:22:35 ± (1.00) 1.g4 Rh8 2.Qxf7+ Kxh6 3.f4 Rg8 4.Qxb7 Nc7 5.h3 Bg7 01:41:27 The ply depths are not recorded, but Fritz switched to g4 at about 12/37. It stuck a long time at this depth, as you can see this took 28:15 on a PII 400 with 128MB. I ended the analysis at depth 14/44 or some such, but if g4 is not best it would take at least an overnight search to get deep enough.
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