Author: Robert Hyatt
Date: 06:56:36 08/24/98
Go up one level in this thread
On August 24, 1998 at 04:57:58, Andreas Stabel wrote: >I have discovered some small problems with crafty. > >1) If a castling leads to a check, crafty does not output the + after > the move, i.e. O-O is output and not O-O+. > I'll check, although I don't personally like the + after a castling move, but it is supposed to do this automatically. >2) Sometimes crafty does not output the right move list when in analyze > mode. Enter crafty and then analyze mode. Type the > moves a3, a6 and Nf3. If you now type history you only get the first > moves. Below is the output: > > book 0.0s 29% g6 >analyze.Black(1): a6 >a6 >Black(1): a6 > clearing hash tables > time surplus 0.00 time limit 30.00 (3:00) > depth time score variation (1) > 4-> 0.29 0.00 2. Nf3 Nc6 3. Nc3 Nf6 > 5 0.41 0.22 2. Nf3 Nc6 3. Nc3 Nf6 4. e4 > 5-> 0.99 0.22 2. Nf3 Nc6 3. Nc3 Nf6 4. e4 >Nf3 6 0.99 1/19 2. Nf3 >White(2): Nf3 >analyze.White(2): White(2): Nf3 > clearing hash tables > time surplus 0.00 time limit 30.00 (3:00) > depth time score variation (1) >hi 5 0.20 4/19 2. ... d5 >Black(1): hi > white black > 1 a3 ... > 5 1.09 -0.02 2. ... d5 3. e3 Nc6 4. Bd3 Bg4 > 5-> 1.24 -0.02 2. ... d5 3. e3 Nc6 4. Bd3 Bg4 > 6 2.28 -0.32 2. ... d5 3. e3 Bf5 4. Be2 e6 5. O-O > >Note that before the "hi" is typed, crafty outputs "Black(1): " , but it >should have output "Black(2): ". this is on my list to clean up... it has to do with changes made a couple of versions back to support the new winboard/xboard stuff in 4.0.0... > >3) Finally I have a position where crafty does not find a mate in one. > Is this a bug or is it nullmove related or something ? > The FEN is: 7k/4N3/7K/4N3/8/8/b7/8 w - - 0 5 > The mating move is N5g6#. By the way this position arise from a nice > problem with FEN: 6bk/8/3P2K1/4N3/8/8/2r5/1N6 w - - 0 1 > >I run crafty on a Windows 95 with EGTB, ROCK opening book and 24Mb (5Mb) hash. > >Best regards >Andreas Stabel this is the most common question asked. If one side has two knights, and the other side has one pawn or minor piece, crafty will instantly call it a draw, because 99.999999% of all such positions are drawn. The occasionally won KNNKP ending gets the wrong evaluation, of course... as does yours with a bishop instead. But it is write so often that it plays better with this type of eval so it won't trade into a KNN ending if it can avoid doing so, because it will most likely be a draw...
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