Author: Tom Likens
Date: 08:05:30 08/28/03
Go up one level in this thread
On August 28, 2003 at 05:57:24, James T. Walker wrote: >On August 27, 2003 at 22:07:06, Tom Likens wrote: > >>On August 27, 2003 at 11:57:12, James T. Walker wrote: >> >>>Here is a position which came up last night while testing a beta engine. >>>[D]8/4k3/8/4K2p/7P/5rPb/8/6R1 b - - >>>It's hard to find a program that will play Rf1 forcing the rook exchange and >>>progressing to a tablebase won ending. Shouldn't there be some knowledge that >>>would tell engines to do this without searching 30 plies? I mean the bishop >>>covers the queening square of the black pawn which should be a clue to the win. >>>Jim >> >>No claims on how good my engine Djinn is (or isn't ;) but it never really >>considers anything but 1... Rf1 >> >> 2 -3.59 1. ... Rf1 2. Rxf1 Bxf1 <HT> >> 3 -3.59 1. ... Rf1 2. Rxf1 Bxf1 >> 4 -3.47 1. ... Rf1 2. Rxf1 Bxf1 3. Kf4 >> 5 -3.58 1. ... Rf1 2. Rxf1 Bxf1 3. Kd5 Kf7 >> 6 -.-- 1. ... Rf1 2. Rxf1 Bxf1 3. Kd5 Kf7 >> 6 -3.33 1. ... Rf1 2. Rxf1 Bxf1 3. Kd5 Kf7 >> 7 +.++ 1. ... Rf1!! >> 7 -3.54 1. ... Rf1 2. Rxf1 Bxf1 3. Kf4 Be2 4. Ke3 Bd1 >> 8 -3.50 1. ... Rf1 2. Rxf1 Bxf1 3. Kf4 Bh3 4. Ke5 Bg4 5. Kd5 >> >> 2. ... Rf1 >> >>Of course, the question is "does it understand it?" >> >>regards, >>--tom > >Hello Tom, >I would think that since you wrote the program you would underestand better than >anyone why it likes Rf1. The variations show it's probably going to win since >it only has to swap rooks and then protect it's lone pawn untill the white king >can be driven away. >Jim Hey Jim, You would think so wouldn't you? And yet on more than one occasion, (even in relatively simple positions) the program has picked the right move for the wrong reason. If I get some time this evening I'll see if I can track down why it likes 1... Rf1. regards, --tom
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