We cover the board except the last number - but it's on a rolling basis - so each time we bet we are covering 1 less number than before until we get down to 18 numbers left (by then we are covering only half the board). This system is based on the fact that the rarest event on the board is when a single number (or same area of the board) repeats multiple times; therefore the board has to open up - so we capitalise on that and at the same time we take advantage of the carpet layout that they have given us!
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