Author: Howard Exner
Date: 12:53:25 05/06/98
Go up one level in this thread
On May 06, 1998 at 14:25:12, Danniel Corbit wrote: >On May 06, 1998 at 03:46:28, Danniel Corbit wrote: >[snip] >>>K6n/2P5/1q6/8/8/7k/8/n7 b >>> >>>White: Ka8 Pc7 >>>Black: Kh3 Qb6 Na1 Nh8 >>> >>>Black to move cannot win this position despite the huge material >>>advantage. Computers will know in there search that exchanging the >>>Queen for the pawn will lead to a draw but probably most, if not all, >>>will give black a big plus score in the eval. >>> >>>Black's best try is to enter a QNK v QK ending (white will win one of >>>the >>>black Knights with a check/fork) but that is a draw also. Unless Ferret >>>finds a mate in two hundred and something :-) >>I'll have to let this one crank. It seems funny that a huge positive >>eval would result when the result is fairly obvious. >You are right that the eval stays huge. Here are the last five of >twenty plies by Crafty: Snipped analysis. This position contains three drawing themes 1.The stalemate if capturing the pawn 2.The two Knight draw if the Queen exchanges itself for the pawn 3. The KQN v KQ draw (at least in this position) Crafty and most likely all of todays programs would recognize each individual drawing them but probably cannot make the human leap of seeing them altogether in this problem. This could explain why the eval would remain high. Another wacky position is the bishop ending draw with the rook pawn queening on the opposite colored square. If you set this up but then add seven more bishops (all still the opposite color of the queening square) most programs will have a huge eval and play on to win but in vain.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.