Author: James T. Walker
Date: 14:50:15 03/23/01
Go up one level in this thread
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
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