Author: Rory Nolan
Date: 16:18:57 09/09/02
Go up one level in this thread
On September 09, 2002 at 13:25:50, John Merlino wrote: >On September 09, 2002 at 11:20:28, Janos Keinrath wrote: > >>[D]2kr3r/1p2q1b1/pPp3p1/5p2/3PpP2/1QR1P3/5P1p/2R2B1K b - - >> >>In a blitz game my program played here Kb8 and lost after Bxa6. >> >>Crafty 18.15 after 5 minutes also want to play Kb8 (Celeron 1.2 / 32MB Hash). >> >>Is there any defence for black in this position? >> >>Janos > >Chessmaster 9000, on a PIII-733, does not see anything better than Kb8, but it >appears that White gets plenty of compensation for the material inequality: > >Time Depth Score Positions Moves >0:00 1/3 -2.49 954 1...Kb8 2.Be2 Rh3 >0:00 1/4 -2.47 4854 1...Kb8 2.R3c2 Rd7 3.Bc4 >0:00 1/5 -2.39 19302 1...Kb8 2.R3c2 Rd7 3.Bc4 Rh3 >0:01 1/6 -2.24 68088 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Rd6 > 4.Rc7 Rd7 5.R1c6 >0:01 1/6 -2.32 80285 1...Rd6 2.Bc4 Kb8 3.R3c2 Rh3 4.Qb4 > Rd7 >0:04 1/7 -0.83 298934 1...Rd6 2.Bxa6 Kd8 3.Bc4 Rf6 4.Qa2 > Kd7 5.Qa5 >0:05 1/7 -2.26 342579 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Rc8 > 4.Rxc8+ Rxc8 5.Rxc8+ Kxc8 6.Qd5 > Kb8 7.Kxh2 >0:09 1/8 -1.22 651866 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Rd7 > 4.Qc4 Kb7 5.Rxg6 Qf7 6.Qc6+ Kb8 >1:46 1/9 -0.90 7598545 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Rd7 > 4.Qc4 Kb7 5.Rc8 Qd6 6.Rc6 Qb8 7.Rxg6 >3:45 1/10 -0.72 15648242 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Bxd4 > 4.exd4 a5 5.b7 Qb4 6.Qe6 Qxb7 7.Qe5+ > Ka8 8.Qxa5+ Qa7 > >However, after forcing 1...Kb8 2.Bxa6 bxa6 3.Rxc6 Bxd4 4.exd4, it appears that >Black may be able to hold on: > >Time Depth Score Positions Moves >0:00 1/4 -1.21 11609 4...Rxd4 5.Rxg6 Rd6 6.Qc3 Rhd8 >0:00 1/5 2.04 38511 4...Rxd4 5.b7 Rb4 6.Rc8+ Kxb7 7.Qd5+ > Ka7 8.Rxh8 >0:00 1/5 -0.37 47460 4...a5 5.Rxg6 Rc8 6.Rd1 Qd7 7.d5 >0:01 1/5 -0.40 64477 4...Rd6 5.d5 Qd8 6.b7 Rxc6 7.dxc6 >0:02 1/6 -0.60 129755 4...Rd6 5.d5 e3 6.f3 Rxc6 7.dxc6 e2 >0:02 1/6 -0.77 158307 4...a5 5.b7 Qb4 6.Qe6 Qxb7 7.Qe5+ > Ka8 8.Qxa5+ Qa7 >0:03 1/7 2.77 206387 4...a5 5.b7 Qb4 6.Qe6 Qxb7 7.Rb6 > Ka8 8.Rxb7 Kxb7 9.Qxg6 >0:04 1/7 -0.13 322965 4...Rd6 5.d5 Qd8 6.Rc7 Re8 7.R1c5 > g5 8.Kxh2 gxf4 >0:08 1/7 -0.40 612144 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Kb7 9.Rxh2 Rxh2+ > 10.Kxh2 Kxb6 >0:13 1/8 -0.17 981677 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Kb7 9.Rxh2 Rxh2+ > 10.Kxh2 Kxb6 11.Ra1 >0:29 1/9 -0.26 2176735 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Rd2 9.Rxh2 Rxh2+ > 10.Kxh2 Kb7 11.Kg3 Kxb6 >0:47 2/10 -0.23 3545415 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Rd2 9.Rxh2 Rxh2+ > 10.Kxh2 Rxf2+ 11.Kg3 Rb2 12.f5 Rxb6 >1:42 3/11 -0.28 7974652 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Rb4 9.Rxh2 Rf8 > 10.Rh6 a5 11.Rh7 Rxb6 >4:08 4/12 -0.33 20277431 4...e3 5.Qxe3 Qe4+ 6.Qxe4 fxe4 > 7.Rxg6 Rxd4 8.Rg2 Rd2 9.Rxh2 Rxh2+ > 10.Kxh2 e3 11.Rc7 a5 12.Re7 exf2 > 13.Kg2 a4 > >jm Here's what DJ 7 had to say on an amd xp1900+ 128mb for hash New game 2kr3r/1p2q1b1/pPp3p1/5p2/3PpP2/1QR1P3/5P1p/2R2B1K b - - 0 1 Analysis by Deep Junior 7: 1...g5 2.fxg5 Qxg5 -+ (-2.20) Depth: 3 00:00:00 1...a5 2.R3c2 -+ (-2.47) Depth: 3 00:00:00 1...a5 2.Qa4 -+ (-1.65) Depth: 6 00:00:00 1kN 1...a5 2.Rc5 Kb8 -+ (-1.64) Depth: 9 00:00:00 7kN 1...a5 2.Qa4 Bf6 3.Qxa5 Kd7 4.Qa7 Ke8 5.Ra3 Kf7 ³ (-0.63) Depth: 12 00:00:02 2611kN 1...Rd7 2.Bxa6 µ (-1.11) Depth: 12 00:00:02 2611kN 1...Rd6 2.Bxa6 Kb8 3.Bf1 µ (-1.35) Depth: 12 00:00:03 3641kN 1...Rd6 2.Bxa6 Kb8 3.Bf1 Rf6 4.Qa2 Qd6 5.Qa7+ Kc8 6.Qa8+ Qb8 7.Ra3 Qxa8 ³ (-0.49) Depth: 15 00:00:13 14792kN 1...Kb8 2.Bxa6 Rd7 3.Bxb7 Rxb7 4.Rxc6 Qd8 5.Qe6 Qd7 6.Qa2 Rh3 ³ (-0.66) Depth: 15 00:00:18 14792kN 1...Kb8 2.Bxa6 Rd7 3.Bxb7 Rxb7 4.Rxc6 Qe8 5.Qa2 Qf7 6.Qa6 ³ (-0.39) Depth: 17 00:00:59 65458kN 1...Rd6 2.Bxa6 Kd8 3.Ra1 Qh4 4.Bxb7 Qg4 5.Qd1 Qxd1+ 6.Rxd1 c5 7.f3 Rd7 8.Bc6 cxd4 9.Rc4 Rd6 10.exd4 ³ (-0.59) Depth: 17 00:01:27 69753kN 1...Rd6 2.Bxa6 ³ (-0.29) Depth: 18 00:03:15 215891kN 1...Rd6 2.Bxa6 Kd8 3.Qa2 Ke8 4.Bc4 Rd7 5.Be6 Rd8 6.Ra3 Qh4 ³ (-0.28) Depth: 19 00:07:30 501690kN (Nolan, Sutton 10.09.2002) regards, Rory
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