Author: Robert Hyatt
Date: 08:29:52 01/24/00
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On January 24, 2000 at 11:08:16, Chris Taylor wrote: >wtm: Broken positions: 652182615 > >Snipped from you post > >What does Broken positions mean please? > >Chris Taylor These are positions that can't actually be reached. IE they are legal configurations of pieces, but there is no legal move to lead to this position... for example black is in check at this move, and he would also be in check after any possible 'unmove' he can make, which means that this position can't be reached, but if it could, it is actually legal. There are other definitions of broken, such as two pieces on the same square (a probe is done by taking the 6 bit values for the locations of each piece... and it is possible for two of the 6 bit values to be the same. I don't think Eugene indexes such positions so they might not count... or he may index them but compress them out when he writes the final version of the file.) Steven Edward's files counted these positions, since there was no compression except for the symmetry case that is well- known.
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