Author: Vincent Diepeveen
Date: 03:55:35 12/10/02
Go up one level in this thread
On December 10, 2002 at 02:34:40, Tony Werten wrote: >On December 10, 2002 at 01:03:48, Luis Smith wrote: > >>On December 09, 2002 at 12:51:26, Nicolas GUIBERT wrote: >> >>>On December 09, 2002 at 12:45:51, Timothy J. Frohlick wrote: >>> >>>>Nicolas, >>>> >>>>Excellent world-class site. When your program is commercially available let us >>>>know. >>>> >>>>TJF >>> >>>Thank you very much. >>> >>>I'll let you know. >>> >>>I strongly suggest you to subscribe to the newsletter. That's the best way to be >>>informed quickly. >> >>Draughts and checkers=same things correct? So then where is cake and Chinook..? >> Or is that a completly different game? > >Yes, there are 3 major differences. > >Draughts is played on a 10 by 10 board. > >In draughts, nonkings are allowed to capture backwards. > >Kings move like (chess)queens. So it's allowed to pass over 2 empty >squares,capture a piece on the 3rd square, then change direction (only on the >square immediately after the captured piece ) fly over 3 empty squares again, >and capture another piece (and stopping on the square immediately after the >captured piece). > >Tony In checkers when you capture over the promotion square with a non-queen then it gets a queen. in draughts also called international 10x10 checkers with polish rules, you don't promote. but most important is the result of the bigger board with regard to endgame. In draughts winning is a lot harder than in checkers. There is up to 6 piece EGTBs in checkers. this where the 7 men are a peanut to generate in checkers, not to mention that 8 men can get generated too without too much of a problem. We talk about a game where you start with just like 12 stones both sides and you can get already from openings position directly in the EGTBs. The other lines there the evaluation queen versus non-queen is a lot simpler too (no backwards recaptures possible so winning back a queen is way harder). playing near to perfect in checkers is not so hard for a professional game programmer. In draughts with 20 against 20 stones this is way way harder to get to the 6 men. Though the 6 men are a big improvement for draughts in endgame, it is very likely that the EGTBs are less of a need. See how easily napoleon came in 4th. Both games napoleon lost (against Dam and against tornado) were non-egtb problems. Against DAM the problem was the evaluation of a queen versus 2 pieces and against tornado it was the fact that i was so stupid to implement a kind of single nullmove 1 day before the tournament started which missed that it had to give away a piece in order to win the game (Napoleon had a winning position against Tornado). On the other hand we had an easy draw against Buggy. EGTB wasn't the problem in either of the 2 games. Just testing and bugs were. In checkers things are different. You can play near to perfect checkers simply. Just no one who is professional in the field ever done it. Of course the achievement of Chinook we all know as a standard, but this is years ago. The search depths reported i already search fullwidth in draughts. Best regards, Vincent
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