Author: Joachim Rang
Date: 15:06:36 10/02/02
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On October 01, 2002 at 21:41:34, John Merlino wrote: >And, how do they evaluate this positon that resulted from it? Larry played f3, >which certainly appeared to be good. Susan Polgar said that she thought Qh1+ >would lead to a won endgame. > >[D]8/p1p5/Pp1p2nk/1P1B3q/2P1Ppr1/1Q4p1/R5P1/3R1K2 b - - 0 57 > >And, finally, if Larry had played Qh1+, this position would have resulted. What >say your programs now? Do they play Qf3+, Ne5+ or Qh3? Any input from strong >humans would also be greatly appreciated.... > >[D]8/p1p5/Pp1p2nk/1P1B4/2P1Ppr1/1Q1K2p1/R5q1/3R4 b - - 0 59 > Great position! I let different programs play from this position and CT14 showed the winning line in a match against Fritz 7.008 I set a depth of 14 for each move, which takes on my duron 735 Mhz in the beginning about 30 min/move. Here is the game (from the position above): Fritz 7 - Chess Tiger 14.0 [A28] cm-christiansen-endgametest, 14ply/14pl JOACHIM (2), 02.10.2002 W=14.7 ply; 359kN/s B=14.7 ply; 220kN/s ... 59... Qh3 60.Rg1 g2+ 61.Kc2 Rg3 62.Qb4 Ne5 63.c5 bxc5 -1.40/14 46:35 64.Qd2 -0.44/14 11:13 Kh7 -0.84/14 12:14 65.Kb1 0.00/14 13:57 f3 (Nf3) -1.60/14 13:52 66.Qd1 (Qf4) 0.00/14 10:10 66...Nd3 -1.82/14 7:24 67.b6 (Rd2) 0.00/14 6:01 67...cxb6 -2.30/14 3:53 68.Bg8+ -0.62/14 4:15 Kg7 (Kh8) -2.72/14 1:45 69.Bc4 -0.66/14 2:44 Ne5 (f2) -2.86/14 6:17 70.Bd5 (Bb5) -0.69/14 13:57 70...Qh6 (Qh2) -3.26/14 2:29 71.Qe1 -1.09/14 12:35 Qf4 -3.04/14 2:16 72.Rf2 -1.37/14 7:10 Kg6 -3.16/14 6:51 73.Qc3 (Qd1) -1.56/14 11:39 73...b5 -3.66/14 5:23 74.Ka2 (Kc2) -1.97/14 34:07 74...b4 -3.64/14 2:25 75.Qb3 (Qc2) -2.06/14 11:59 75...Ng4 (Kh5) -4.62/14 3:54 76.Qc2 -2.47/14 33:45 Nxf2 -4.65/14 7:47 77.Qxf2 adjud. -2.62/14 5:19 0-1 60 Kc2 is another possible line, but every engine I tried changes to Rg1 after few minutes. Tonight I will run another match with the move 60.Kc2 Do you see better defence for white, than Fritz 7.008 found? 60.Rg1 g2+ 61.Kc2 (forced) Rg3. 62. Qb4 (or Qb2) Ne5 in this position most engines after a few minutes begin to realize, that black has an advantage. Most engines switch from the more logical Qd2 to c5 after few minutes.
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