Author: Ferdinand S. Mosca
Date: 01:19:13 06/10/01
Go up one level in this thread
On June 08, 2001 at 15:19:09, Robert Hyatt wrote:
>Here is a cute position that occurred between a commercial program and Crafty
>last week:
>
>[D] 8/p4pp1/3rk2p/4p3/2P5/2K4P/P2R1PP1/8 w - - 0 1
>
>Crafty was black and moved the rook to d6, offering a trade. The opponent
>took it and was happy to do so. Unfortunately, white is lost. White saw
>the passed pawn and apparently was quite happy. Crafty's static evaluation
>for this position is -1.0 roughly.
>
>For those that "don't do endgames" black's king-side majority is the problem
>here. White's passer gets blockaded, white has to desert it to stop black's
>kingside passer he makes after a few pawn moves, and then black eats white's
>a pawn and promotes.
>
>Instructional, at least. These are the kinds of positions you want to
>see your program get right. I saw a very similar one against a GM today,
>playing Crafty. He calculated for a long time after crafty offered to trade
>the last piece on the board. He traded, and 10 moves later realized he was
>dead lost. :)
Hi Bob,
Here is my line (below) on how to secure the draw for white, the key is 2. g4
the idea is to have a good grip on the square e4 and f5-light squares, so that
white's king can enter black's position via d3/e4/f5.
The king strategically here should not move to queenside since there's no passed
pawn/potential passed pawn there to stop, in fact it is white's c-passed pawn
that should be stopped by black, and white will just pretend to defend it but
its intention really is to penetrate the currently unweakened pawn majorities of
black. With this plan too it is very important to move h4/h5 swiftly.
If black will try to force occupation of f5 by preparatory move g6, then there
was a tactical threat over the queenside using the passed c-pawn of white, this
tactical shot is probably present because black has made some preparatory moves
on the kingside due to the move 2. g4.
An important thing here probably is to weaken first the majorities before
deciding on where to put the king. Sounds difficult for programs, but the
knowledge to stop the passed pawn with the king is the most basic one.
White's king is confused here, to assist his passed c-pawn or to block black's
potential passed pawn, that is if one knows what is majority, because black has
no passed pawn currently.
1. Rxd6+ Kxd6 2. g4!! Kc5
(2... g6 3. Kb4 f5
(3... Kc6!? 4. c5 f5 5. gxf5 gxf5 6. Kc4 and black
has some problems)
4. gxf5 gxf5 5. Kb5!
{if black will not give up the square d4
easily then white can support his c-pawn for promotion.}
5... e4 6. c5+ Kd5 7. c6 Kd6 8. c7 Kxc7
9. Kc5 f4 10. Kd4 e3 11. fxe3 f3
12. Kd3 Kd6 13. e4 f2 14. Ke2 Ke5 15. Kxf2 Kxe4 16. Kg3 =)
3. f3! g6
(3... h5!? 4. gxh5 f5 5. Kd3 Kb4
6. h4 Kc5 7. Kc3 e4 8. fxe4
fxe4 9. h6 gxh6 10. h5 a6 11. a3 a5 12. a4 e3
13. Kd3 Kb4 14. c5 Kxc5 15. Kxe3 Kb4 16. Kd4 =)
4. h4! planning to have control on the light squares 4...f6
(4... f5?? 5. h5! gxh5 6. gxf5 Kd6 7. Kd3 h4
8. Ke3 h3 9. Kf2 and white wins - with similarity to the line
given by Albert from other post)
5. Kd3 Kb4
(5... h5 6. gxh5 gxh5 7. Ke4 =)
6. Ke4 Kxc4 7. h5 g5
(7... gxh5 8. gxh5 a5 9. Kf5 Kb4 10. Kxf6 =)
8. Kf5 Kd4 9. Kxf6 draw.
Regards,
Dinan
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