Hosted by The Math Forum## Problem of the Week 1014## Dominating Bishops
How many ways are there to place 9 bishops on a 9x9 chessboard so that they dominate the board, meaning that every square is attacked by a bishop (or has a bishop on it)?
Source: A nice new book containing many chessboard puzzles by John Watkins, © Copyright 2004 Stan Wagon. Reproduced with permission. |

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28 September 2004