Author: Dan Ellwein
Date: 19:22:38 02/09/04
Go up one level in this thread
On February 09, 2004 at 14:26:47, Joachim Rang wrote: >On February 09, 2004 at 13:59:13, Albert Silver wrote: > >>On February 09, 2004 at 13:33:35, Joachim Rang wrote: >> >>>On February 09, 2004 at 12:29:09, John Merlino wrote: >>> >>>>On February 09, 2004 at 10:00:00, Albert Silver wrote: >>>> >>>>>Jose Garcia Ruvalcaba posted some correspondence games of his at CTF, including >>>>>a loss in 1999 to Anatoly Sidenko. Sidenko came up with a superb move, that >>>>>makes a good test position for today's super bots. >>>>> >>>>> Albert >>>>> >>>>>[D]r2r1b2/3b1k1p/2p2pp1/p3n3/R3NNP1/7P/PPP5/1KB1R3 w - - 0 30 >>>>> >>>>>30. Nxf6!! Kxf6 31. g5+ Kf5 32. Nd5! >>>> >>>>Chessmaster 9000, SKR personality on a P4-2.4, needs almost 4 minutes to find >>>>30.Nxf6. It doesn't find the full line above because it prefers 31...Kf7 for >>>>Black. >>>> >>>>Time Depth Score Positions Moves >>>>0:01 1/7 -0.26 257972 30.g5 Bb4 31.c3 c5 32.Nd6+ Kg8 >>>> 33.cxb4 Bxa4 34.bxc5 >>>>0:01 1/7 -0.08 293867 30.Bd2 Nf3 31.Re2 f5 32.gxf5 Bxf5 >>>> 33.Kc1 Nxd2 34.Rxd2 Rxd2 35.Kxd2 >>>>0:02 1/8 -0.26 436644 30.Bd2 Nf3 31.Rd1 f5 32.gxf5 gxf5 >>>> 33.Bxa5 Rxa5 34.Ng5+ Nxg5 35.Rxa5 >>>>0:03 1/8 -0.11 649976 30.g5 Nf3 31.Rf1 c5 32.Ra3 Nxg5 >>>> 33.Nxg5+ fxg5 34.Ne2+ Kg8 35.Bxg5 >>>> Re8 >>>>0:06 1/9 -0.30 1184350 30.g5 Nf3 31.Rf1 c5 32.Ra3 f5 33.Raxf3 >>>> fxe4 34.Re3 Bf5 >>>>0:12 1/9 -0.20 2471512 30.Rf1 Bb4 31.Ne2 c5 32.Rxf6+ Kg7 >>>> 33.Rxb4 axb4 34.N2g3 h6 35.Be3 >>>>0:26 1/10 -0.25 5211831 30.Rf1 Be7 31.Ne2 c5 32.Ra3 Bc6 >>>> 33.N2g3 Bb5 34.Rf2 a4 >>>>0:36 1/10 -0.08 7404621 30.g5 Nf3 31.Rf1 c5 32.Ra3 Nxg5 >>>> 33.Nxg5+ fxg5 34.Nh5+ Bf5 35.Bxg5 >>>> Be7 36.Bxe7 Kxe7 >>>>0:58 1/11 -0.07 11866493 30.g5 Bb4 31.c3 c5 32.Nd6+ Kg8 >>>> 33.cxb4 Bxa4 34.bxc5 Nf3 35.Re7 >>>> Nxg5 36.Nd5 >>>>2:17 1/12 -0.41 29014096 30.g5 Bb4 31.Re2 c5 32.Rxb4 axb4 >>>> 33.gxf6 Bb5 34.Re3 Rac8 35.b3 h6 >>>> 36.a4 >>>>3:55 1/12 0.31 51993673 30.Nxf6 Kxf6 31.g5+ Kf7 32.Rxe5 >>>> Bb4 33.a3 c5 34.axb4 Bxa4 35.b3 >>>> Bd7 36.bxc5 a4 >>>>6:01 2/13 0.07 81179162 30.Nxf6 Kxf6 31.g5+ Kf7 32.Rxe5 >>>> Bb4 33.a3 c5 34.axb4 Bxa4 35.b3 >>>> Bd7 36.bxc5 Bc6 37.Re6 Rac8 >>>> >>>>Here is what it says after forcing 30.Nxf6 Kxf6 31.g5+: >>>> >>>>Time Depth Score Positions Moves >>>>0:00 1/5 -1.19 22669 31...Kf5 32.Rf1 c5 33.Nd3+ Ke6 >>>> 34.Re4 Bd6 >>>>0:00 1/6 -0.91 58777 31...Kf5 32.Ne2 Ke6 33.Nf4+ Kd6 >>>> 34.Rd4+ Kc5 35.Rdd1 Nf3 >>>>0:01 1/7 -1.18 221951 31...Kf5 32.Rf1 Bb4 33.Nd5+ Ke6 >>>> 34.Nc7+ Ke7 35.Nxa8 Rxa8 36.h4 >>>> Rf8 37.Rxf8 Kxf8 >>>>0:03 1/8 -0.34 732207 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4 >>>> 34.Rxb4 Ke6 35.Rh4 c5 36.Rxh7 Bc6 >>>>0:05 1/9 -0.27 1221888 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4 >>>> 34.Rxb4 Ra5 35.Rbe4 Re8 36.Bd2 Raa8 >>>>0:14 1/10 -0.14 3292467 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4 >>>> 34.Rxb4 Ra5 35.Rf4+ Ke6 36.Bd2 >>>> Rd5 37.Bc3 Bc8 >>>>0:46 1/11 0.50 10886296 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4 >>>> 34.Rxb4 Be8 35.Rf4+ Ke6 36.Rf6+ >>>> Kd5 37.b3 Nf7 38.Re7 Kc5 39.Be3+ >>>> Kb5 40.Rfxf7 Bxf7 41.Rxf7 >>>>0:56 1/11 0.27 12970164 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4 >>>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2 >>>> Rxe5 38.Bxe5 >>>>1:05 1/12 0.06 14886616 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4 >>>> Bxa4 35.b3 Bd7 36.bxc5 Bc6 37.Re6 >>>> Rac8 >>>>1:31 2/13 0.11 21101857 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4 >>>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2 >>>> Bc6 >>>>3:12 3/14 0.06 42066786 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4 >>>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2 >>>> Bc6 38.Bc3 Rxe5 39.Bxe5 >>>>6:59 4/15 0.06 95455632 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4 >>>> Bxa4 35.b3 Bd7 36.bxc5 a4 37.b4 >>>> Ra7 38.Nd5 Bxh3 39.b5 >>>> >>>>jm >>> >>> >>>This confirms my hypothesis, that there is no forced win after Nxf6 and that the >>>position after 31...Kf7 is about equal. >>> >>>regards Joachim >> >>Yes, I can't find any improvement, and only really analyzed Kf5. 30. Nxf6 is >>still the move to play though as other moves seem much worse. >> >> Albert > > >I agree. 30.Nxf6 is the correct solution and it's a nice test position, also one >should notice that it is only equalizing. > >regards Joachim CMOffSet on a Cel 1.7 finds Nxf6 after 8 sec and stays with it also... Time Depth Score Positions Moves 0:01 1/6 0.22 62323 1.Rf1 c5 2.Nxg6 hxg6 3.Rxf6+ Kg8 4.Ra3 Bg7 0:02 1/6 0.31 93654 1.Nxf6 Kxf6 2.g5+ Kf5 3.Nd5 Bd6 4.Rf4+ Ke6 5.Rf6+ Kxd5 6.Rd1+ Kc5 7.Rfxd6 0:02 1/6 0.66 113546 1.Be3 c5 2.Ra3 c4 3.Bb6 Bxa3 4.Bxd8 Rxd8 5.bxa3 0:03 1/7 -0.20 170189 1.Be3 c5 2.Ra3 Bc6 3.Bxc5 Bxe4 4.Bxf8 Kxf8 0:04 1/7 0.32 255156 1.Nxf6 Kxf6 2.g5+ Kf5 3.Ne2 Ke6 4.Rh4 Kf7 5.Nd4 Bd6 6.Rxh7+ Kg8 0:04 1/7 0.35 293622 1.Rf1 c5 2.Ra3 Bb5 3.Nxg6 Bxf1 4.Nxe5+ Kg7 5.Rf3 0:05 1/7 0.61 399073 1.Bd2 Nf3 2.Rd1 Be8 3.Nd3 c5 4.Ra3 0:07 1/8 0.60 581616 1.Bd2 Nf3 2.Re2 Nxd2+ 3.Rxd2 c5 4.Ra3 c4 5.Rf3 Bc6 6.Rxd8 Rxd8 0:08 1/8 1.10 759862 1.Nxf6 Kxf6 2.g5+ Kf5 3.Rf1 Bd6 4.Nxg6+ Kxg6 5.Rf6+ Kg7 6.Rxd6 c5 0:13 1/9 1.28 1467318 1.Nxf6 Kxf6 2.g5+ Kf5 3.Nd5 Ra7 4.Ne3+ Ke6 5.Ng4 Bd6 6.Rae4 Kd5 7.Nxe5 Bxh3 0:27 1/10 1.60 3560837 1.Nxf6 Kxf6 2.g5+ Kf7 3.Rxe5 Bb4 4.c3 c5 5.cxb4 Bxa4 6.bxc5 Bc6 7.Re6 1:02 1/11 1.51 8726704 1.Nxf6 Kxf6 2.g5+ Kf7 3.Rxe5 Bb4 4.c3 c5 5.cxb4 Bxa4 6.bxc5 Bc6 7.Re1 Rac8 2:19 1/12 1.58 20843121 1.Nxf6 Kxf6 2.g5+ Kf7 3.Rxe5 Bb4 4.c3 c5 5.cxb4 Bxa4 6.bxc5 Bc6 7.Re1 Rab8 8.Ne6 7:09 2/13 1.75 66657969 1.Nxf6 Kxf6 2.g5+ Kf7 3.Rxe5 c5 4.Rc4 Bd6 5.Rexc5 Bxc5 6.Rxc5 Ra7 7.h4 Bg4 8.Nd3 Kg7 9.Bf4 Rf7 Dan
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