Author: Laurence Chen
Date: 23:58:27 01/18/00
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On January 18, 2000 at 14:30:28, blass uri wrote: >What is the difference between Junior6a and Junior6? >Is the main difference in the evaluation or in tactics? > >I know that Junior5.9 is blind in some positions and cannot see simple tactics. >I told Amir Ban about the problems some monthes ago but most of the problems >were not fixed in Junior6(I asked someone who has Junior6) > >Is it the same for Junior6a? > >1)Does Junior6a also has problems in seeing a simple stalemate in the following >position? > >6r1/7k/Q7/8/7K/7B/8/6qq w - - 0 1 Deep Junior finds the stalemate easily > >I understood that in this case the problem is in detecting stalemates when >Junior is wrong in evaluating the position with no king as a checkmate and not >as a stalemate. > >Junior seems to use a rule that is usually right for detecting stalemates but >not right in this case. > >2)Does Junior6a play the mistake f5 in the following position instead of fxe5? >8/6p1/4pp2/2k1P2p/1pP1p2P/1K2P3/5PP1/8 b - - 0 1 > Both Junior 6a and Deep Junior thinks that it's still possible to capture En Passant after White plays f4 a move later, which is against chess rules. This is a major flaw or bug in the chess engine. I hope Amir Ban fix this problem soon. >To be fair Junior5.9(and I guess that also Junior6) may avoid the mistake >in a game leading to this position thanks to the learning function and the fact >that it is not blind some plies before this position. > >3)Does Junior6a suggest after Rc2-c3 the move Qd3-b1 Rc2 with evaluation of >a draw without understanding that the queen cannot go back to d3? >3rb3/6pk/2p1Pp2/1pQ2P1p/p6P/P2q1BP1/1PR3K1/8 w - - 0 1 > >4)Do other programmers know about similiar problems with their programs and how >much time do they need to fix them? > >Maybe this post is unfair to Junior because I tested Junior for a long time and >did not do it for other programs that may have other positions when they are >blind(except the known null move problem). > >Uri
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