17 May 08
Originally posted by petrovitchI put Fritz 9 in full analysis and it found a couple of mates in less time than it took to take my hand off the mouse. The main line was mate in 4 bizarrely with the quicker mate a side variation.
About a month ago I was doing a post-game analysis with Crafty. When it got to the position where I executed a winning combination I was surprised that Crafty could not find the winning move. Crafty kept insisting on a move that drew instead.
Later, I saw in one of Alexandra Kostiniuk's podcasts in Chess Killer Tips where a simple mate in 2 was prese ...[text shortened]... Mate in 2 by Almira Skripchenko
"Fritz-10 cannot see the winning move."
www.chessqueen.com
17 May 08
4 edits
Originally posted by petrovitchyou can do anything crafty does with them, only more and a lot better.
Off topic, but I've never used ChessMaster, Rybka, and haven't had Fritz since the MS/DOS version. What features do any of these program has that are unique? Besides their rating -- I've read a lot about Rybka.
I've seen several games in pgn files that were annoFritzed. I assume this is similar to annotate or hannotate with Crafty?
Rybka is known for being the best chess playing "entity" with a positional style, and it has a unique feature called randomizer. it's a little tough to explain, but it (the randomizer) is probably the best tool so far for analysing openings. you start from a position, then start the randomizing process, and in a few minutes, you have thousands of games played for each variation you like, of course in extremely small time controls. looking at the statistical results, that way you can have a pretty accurate assesement of opening positions or unclear positions in the middlegame or maybe even in the endgame.
rybka also has a seperate engine called winfinder spesifically for combinations and tactical analysis, which would probably solve almost all tricky problems that "engines cannot solve".
17 May 08
2 edits
This is one of the most difficult problems I've ever tried to solve. It's all about the gain in tempo with a pin. It came from a game between Fressinet - Kosteniuk, 2007. This position never actually occurred in the real game, but it was a possible variation.
Several chess engines can not find the solution to this problem. The solution is mate!
Black to move and win.
18 May 08
Originally posted by SwissGambitAllow a rookie a question? Where is the mate in 2 if :
That's got to be a programming bug if Fritz 10 can't see it.
1.Re1! [zugzwang]1...Bg2 2.Qh4#A simple brute-force search should easily find this.
1...B~ 2.Qg1#
1...Kxe1 2.Qd2#
Edit: I just saw MadRook's post, and I think he has the answer. Fritz on "infinite analysis" does not always find the fastest mate. He is often content just t ...[text shortened]... at there [b]is a forced mate and leave it at that. I have Fritz 9 and it does this too.[/b]
1...Pf4 ?
18 May 08
Originally posted by petrovitchafte 5 minutes my Fritz 10 was not able to find solution to this problem 🙂...lol, even after playing something like 13 moves(not half moves!) deep in the position it still can not see the fortress and thinks black is winning and keeps shuffling pieces around 😛
[fen]7r/p3k3/2p5/1pPp4/3P4/PP4P1/3P1PB1/2K5[/fen]
Didn't know you couldn't post more than one fen per message. 🙂
18 May 08
Originally posted by petrovitchIt's so funny, Strelka stops processing after 16 ply because it has found a mate in 9. The only thing is that it's not a mate in 9. It also shows longer mates for other variations and these too are inaccurate.
This is one of the most difficult problems I've ever tried to solve. It's all about the gain in tempo with a pin. It came from a game between Fressinet - Kosteniuk, 2007. This position never actually occurred in the real game, but it was a possible variation.
Several chess engines can not find the solution to this problem. The solution is mate!
[fen]8/8/4k3/2b3p1/8/5RP1/r4P2/6K1[/fen]
Black to move and win.
Tolga II processes way beyond the number of moves required for mate and it never finds it. It's order of alternative moves is correct, but it's evaluation is inaccurate.
18 May 08
Originally posted by SwissGambitThere is also ..Qh4+ followed by ..Rg5#, but i prefer your's. 🙂
That's got to be a programming bug if Fritz 10 can't see it.
1.Re1! [zugzwang]1...Bg2 2.Qh4#A simple brute-force search should easily find this.
1...B~ 2.Qg1#
1...Kxe1 2.Qd2#
Edit: I just saw MadRook's post, and I think he has the answer. Fritz on "infinite analysis" does not always find the fastest mate. He is often content just t ...[text shortened]... at there [b]is a forced mate and leave it at that. I have Fritz 9 and it does this too.[/b]
