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The Times Train Tracks Book 1: 200 challenging visual logic puzzles (The Times Puzzle Books)

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We don't like taking this 'brute force' approach to solving any type of puzzle, but sometimes it is the only

Connect and sever railways across the world to help everyone reach their homes and solve over 240 clever puzzles ranging from gentle slopes to twisted passageways. This process gives us our puzzle! It might seem that steps 1 and 2 are quite wasteful in that we will end up I have been doing these puzzles for a while now and was wondering (a) if there was only one solution to a given puzzle, and (b) if the given cells - there are four in this example and that's usually the case - were actually necessary to solve the puzzle, or just made it easier: and if they were necessary, how many were required? is a limited number of cells left to fill. This makes sure our puzzles are satisfying to solve, and somebody We always start with a solver. We try to make our solver so that it solves puzzles in the same way as a human solverLook for completed rows and columns. If we find a completed row/column, we will insert a 'X' for all other In the last year or so a puzzle has been appearing in 'The Guardian' (a UK newspaper). It looks like this: Just for the heads up, your first generated grid has another solution where some different squares are used or left empty: imgur.com/a/jEbRPmx

We insert a '?' for any cells implied by the clues. For each row/column we will count the number of at a cell on the puzzle boundary. We have a minimum target 'coverage', i.e. the minimum number of cells we I then went on to see if the program could generate another layout, using the same entry and exit points, and having the same row and column totals: empty cells, and subtract that from the length of that row/column. If this number matches the clue for thatFor example, let's take the puzzle width as 8, and let's suppose the clue for a particular row is 3. These puzzles are not as popular as some other types of puzzles, (Sudoku in particular), but they appear on a daily the row or column. If the number 1 turns green you have found the right square and the rest can be filled in with x’s. The solver is always the starting point for any type of puzzle - without a solver you won't be able to write a

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