Author: Mark Young
Date: 16:05:15 10/22/98
Go up one level in this thread
On October 22, 1998 at 16:27:31, Robert Hyatt wrote: >On October 22, 1998 at 14:25:28, Mark Young wrote: > >>On October 22, 1998 at 13:03:26, Bruce Moreland wrote: >> >>> a b c d e f g h >>> +---+---+---+---+---+---+---+---+ >>>8 | |///| |///| |///| |///| 8 >>> +---+---+---+---+---+---+---+---+ >>>7 |///| |///| |///| B |/p/| | 7 >>> +---+---+---+---+---+---+---+---+ >>>6 | |///| |///| P |///| |///| 6 >>> +---+---+---+---+---+---+---+---+ >>>5 |///| |///| |///| |/p/| P | 5 >>> +---+---+---+---+---+---+---+---+ >>>4 | |/b/| |/k/| |/P/| |///| 4 >>> +---+---+---+---+---+---+---+---+ >>>3 |///| |///| |///| K |///| | 3 >>> +---+---+---+---+---+---+---+---+ >>>2 | |///| |///| |///| |///| 2 >>> +---+---+---+---+---+---+---+---+ >>>1 |///| |///| |///| |///| | 1 >>> +---+---+---+---+---+---+---+---+ >>> a b c d e f g h >>> >>>8/5Bp1/4P3/6pP/1b1k1P2/5K2/8/8 w - - 0 1 >>> >>>The key is Kg4 >>> >>>Programs want to play fxg5, because this wins a pawn, prepares to get a passer, >>>etc. >>> >>>I haven't seen detailed analysis, but I assume that this draws, because black >>>gets back to h8 somehow, and then he can sacrifice his bishop for the e6 pawn >>>eventually, and white is left with the wrong rook pawn. >>> >>>Does anybody figure this position out? If so, how did you do it? Does it >>>require speculative knowledge that might lead to a sub-optimal result in other >>>cases? >>> >>>bruce >> >>Rebel 8, Rebel 9, and Rebel 10 are the only programs I know of that can find the >>key move in this position. Rebel 9, and Rebel 10 being the only ones that can >>find Kg4 in well under 10 min. and stick with. >> >>Here is what Rebel 10 thinks of the position. >> >>Kg4 found at ply 16 score 2.77 >>Kg4 Be7 Kf5 g4 Kxg4 Ke4 Be8 >> >>At ply 17, score now 3.20 same line of play. > > >to be sure this isn't "cooked" can you post the analysis where it decides >that the pawn capture leads to a draw? Or what was the eval for the capture >vs Kg4 in the iteration where it changes??? Rebel 10 liked fxg5 from iteration 1 thur 16. 16.00 2.68 fxg5 Ke5 h6 gxh6 gxh6 Kf6 Ke4 16.01 ???? f4f5 Finds Kg4 at iteration 16.02 to be better then fxg5. 16.02 2.77 Kg4 Be7 Kf5 g4 Kxg4 Ke4 Be8 At iteration 17, score jumps to 3.20 17.00 3.20 Kg4 Be7 Kf5 g4 Kxg4 Ke4 Be8 And Rebel 10 sticks with Kg4 from interation 16 on up. Rebel never sees that fxg5 leads to a draw, instead finds Kg4 leads to more progress.
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