Author: guy haworth
Date: 10:53:57 01/24/00
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Rob is right that 'broken positions' are 'slots' in the index that do not correspond to a position that can be reached. In fact, given Eugene's indexing, sophisticated in order to make the index-range as short as possible, this means: 1) some (but not all) positions with the side-not-to-move in check 2) index-slots that correspond to two pieces on the same square (e.g. in KQRK) Eugene avoids creating an index for a position where the side-to-move is giving an 'unblockable check' to the side-not-to-move, e.g. Q/R/B/N 'adjacent to' and giving check to the K. This is part of the 'clever bit'. Rgds, Guy
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