Author: Derek Mauro
Date: 12:48:07 03/24/01
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On March 24, 2001 at 15:46:06, Derek Mauro wrote: >On March 24, 2001 at 14:46:12, Derek Mauro wrote: > >>On March 23, 2001 at 17:50:15, James T. Walker wrote: >> >>>On March 23, 2001 at 14:35:06, Derek Mauro wrote: >>> >>>>On March 23, 2001 at 01:09:23, James T. Walker wrote: >>>> >>>>>On March 23, 2001 at 00:49:45, James T. Walker wrote: >>>>> >>>>>>On March 22, 2001 at 17:55:07, Derek Mauro wrote: >>>>>> >>>>>>>I'm no expert on computer chess, but I thought I'd call this to everyone's >>>>>>>attention. I was analyzing one of my recent games with Tiger (reg. and gambit), >>>>>>>and had a drawn position(I had black). >>>>>>> >>>>>>>[D]8/8/8/8/1n6/2K5/p7/6k1 w - - 0 111 >>>>>>> >>>>>>>For some reason, in the obvious draw, Tiger gives it -12 and wants to play >>>>>>>Kxb4?? even after like 20 minutes. All the programs seem to think its about -6 >>>>>>>or so, but they all play the correct move, the obvious Kb2. Is this a bug? >>>>>>>(The 4 piece tablebases will easily solve this bug, but this position is so >>>>>>>incredibly easy that I can't see why it would even need them.) >>>>>>> >>>>>>>This next position is also from the same game that all programs seem to have >>>>>>>trouble with, but I don't believe this is a bug. >>>>>>> >>>>>>>[D]8/1k6/2n5/8/6r1/p1K5/7R/8 b - - 0 87 >>>>>>> >>>>>>>Most programs want to play Nb4, but from there white can force a draw. I think >>>>>>>Ra4 is the correct move (Na5 might also work), but I'm not sure. I also fell to >>>>>>>the tempation of Nb4 during the game :( >>>>>>> >>>>>>>Derek >>>>>> >>>>>>Hello Derek, >>>>>>Can you post a line which gives white the draw after Nb4? It seems to me that >>>>>>black should still win this ending. What am I missing? >>>>>>Jim >>>>> >>>>>This is funny. The more I look at it the more I can't see how to win it either! >>>>>:-) >>>>>Jim >>>> >>>>The rest of the game went like this: >>>>87... Nb4 88. Rh7+ Ka6 89. Kb3 a2 90. Rh6+ Kb5 91. Rh5+ Kb6 92. Rh6+ Kc5 93. >>>>Rh5+ Kd4 94. Rh1 Kd3 95. Rd1+ Ke2 96. Rh1 Kd2 97. Rh2+ Ke3 98. Rh3+ Kf2 99. Rh1 >>>>Rf4 100. Ra1 Ke2 101. Kc3 Re4 102. Rh1 Ke3 103. Re1+ Kf2 104. Ra1 Rg4 105. Kb3 >>>>Ke3 106. Kc3 Ke2 107. Rh1 Ke3 108. Re1+ Kf2 109. Ra1 1/2-1/2 >>>> >>>>Trading rooks on the 1st rank results in the position in the first diagram. All >>>>those moves are pretty much forced. There are a couple other moves in there, >>>>but none of them work (I think). There is no way to trade rooks closer to the >>>>promotion square, I already tried that. I think Ra4 was better, because it >>>>allows the knight to move and eventually attack the promotion square. >>>>Supporting a pawn from behind with a rook is also a basic principle. Very tough >>>>endgame! >>> >>>I worked on this a little while today with Fritz 6e.. This is what "we" came up >>>with. 1....Nb4 2. Rh7+ Kc6 3. Kb3 a2 4. Rh6+ Kd5 5. Rh1 Rh4 6. Rg1 Kc5 7. Rg5+ >>>Kd4 8. Rg1 Rh8 9. Kb2 Ra8 10. Rd1+ Ke3 11. Ra1 Nd3 12. Kb3 Kd4 13. Kc2 Rb8 14 >>>Kd2 Rb2+ & mate in 9 ..... 0-1 >>> >>>I think if Sune Larrson can post lines like this, then so can I. :-) >>>I have no idea if this would really work or not so just consider it as a >>>"dream". >>>Jim >> >>I think that 5. Rh1 is an inaccuracy. The black king want to be on c5. I think >>5. Ra4+ is better because then if the king moves to the 4th rank, that whole >>trick with Rh4 is impossible, since the king has to be on c5. Computers don't >>help too much here. > >Sorry, I meant 5. Ra5+ instead of 5.Ra4+. I am losing my mind. 5.Rh5+ I meant (I hope I got it right this time :)
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