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The board game Mastermind credits Mordecai Meirovitz as author in 1971.

If the players have agreed, a variant authorizes one or more empty spaces in the combination. If the combinations are made of numbers or letters, use large numbers or letters at the end of the alphabet in priority, because the algorithms and the players will often start by trying 1122 and not 5566 (and if it does, use mid range digits). Novice players often forget that the combination can have the same color several times, using 2 or 3 times the same element in the combination can make the game more difficult. However, not all players reason with mathematical algorithms, it is possible to imagine harder to find combinations by trapping the human brain. Always mathematically, if the player's strategy is not known, then there is no combination more difficult than another.įor information, using this type of algorithm, the best combinations (the most difficult combinations to solve) are 1221, 2354, 3311, 4524, 5656, 6643. Mathematically, if the strategy of the code-breaker (guessing player) is known then there are indeed more or less difficult combinations, but as indicated (above), using the optimal strategy of Donald Knuth then no combination is really difficult and all solutions can be found in 5 steps or less.