Author: KarinsDad
Date: 16:51:17 07/27/99
Go up one level in this thread
On July 27, 1999 at 19:28:17, Dave Gomboc wrote: [snip] >>>>> >>>>>White: Kg2, Qd5, pawns on b3, f2, g3, h4. >>>>>Black: Kf6, Qe5, pawns on b4, g7, h7. >>>>>White to move. >>>>> >>>>>I played 43. Qc6+, and my opponent blundered with 43...Qe6?? I went on to win >>>>>the pawn ending after 44. Qxe6+ Kxe6 45. Kf3. >>>> [snip] >> >>43 ... Ke7 44. Qb7+ any 45. Qxb4 winning a pawn >>43 ... Kf7 44. Qb7+ Qe7 (to protect the b pawn) 45. Qxe7 and black's king is >>even further back than with what was played >>43 ... Kf5 44. Qf3+ Kg6 45. Qg4+ any 46. Qxb4 >>43 ... Kf5 44. Qf3+ Ke6 45. Qb3+ any 46. Qxb4 >> >>> [snip] >> >>I don't see Crafty not picking a swindle move in a lost game as being inferior. >>That's all. > >If I back up in the game, Crafty also picks a bad move earlier, ...Qe5, based on >the incorrect PV that is given when analyzing the position that I posted. Bad >assessments are costly, whether they affect the PV in the particular position or >not, because there'll be a different position where it _does_ affect the PV. > >It's not a matter of swindling at all. It's a matter of playing moves that make >the opponent's task difficult. This is _extremely_ important. See Jose's post >for more on that. If Crafty knew (as Bob says it will soon) that the majority >will create an outside passer, it would have preferred to drop its b-pawn and >make White work harder for the win. Crafty may also not have played ...Qe5, >leading to the position that I posted. > Staying with the original position you posted (and not some earlier move), if I look at the 4 variations above (which are the only ones I see off the top of my head other than the one Crafty picked), it appears that one leads to black's king being backed up an additional square and the rest lead to black losing a pawn and no apparent way to force perpetual check or to win the pawn back. If gaining the pawn was difficult to defend, then I may agree with you. Granted, for a human, the ones that lead to white winning the pawn are more complex positions due to the checks. For a computer, this is probably not true (at least I would hope not when searching 12+ ply down). So, a human may allow the loss of a pawn in order to get the checks in, but a computer would try to hang onto the pawn if it saw no way to force something by losing it. Your point is well taken, but this is a lousy example (IMO) and Crafty played as good as the position allowed. KarinsDad :)
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.