Result 3: If there's a second white peg, you know the second color should be on the location where the red pin is. Doerr, B., Spöhel, R., Thomas, H., Winzen, C.: Playing Mastermind with many colors. In: Proceedings of 24th Annual ACM-SIAM Symposium on Discrete Algorithms (SODA 2013), SIAM, pp. 695–704 (2013) Find the location of a red, if you know there's at least one red pin, but do not know in what of the holes it should be. You can find a pin by trying each of the locations. As an alternate color, we use colors we haven't tested yet. This way, we not only find the red pin but also additional information about other colors. The following is an example, if you know there's a red pin, but don't know in which one of the four holes it is. It will also give you the amount of green, yellow and pink. strategy 2 (find red)) Red Yellow Yellow Yellow gives a single white peg, so while we know, red is in the first or second spot, we now know it's not in the first spot. So it's in the second location. We also know there's no yellow color

Source code of the computer program of this article. http://snovit.math.umu.se/~gerold/source_code_static_mastermind.tar.gz Asuncion, A.U., Goodrich, M.T.: Nonadaptive Mastermind algorithms for string and vector databases, with case studies. IEEE Trans. Knowl. Data Eng. 25(1), 131–144 (2013) Doerr, B., Winzen, C.: Playing Mastermind with constant-size memory. Theory Comput. Syst. 55(4), 658–684 (2014) Jäger, G., Peczarski, M.: The worst case number of questions in generalized AB game with and without white-peg answers. Discret. Appl. Math. 184, 20–31 (2015) Result 2: If there's one white peg, you know the red pin is on an incorrect place, and that the alternate color isn't in the codeWhen you’re venturing out to the washing line with your freshly washed clothes and towels, where do you keep your pegs? We’ve got a few peg holder solutions to make the job much easier. If you like to carry the pegs, an over the shoulder bag made specifically for the job is a great option. Just reach around for a peg and you’re done. It’s waterproof and comes with a clip so you can leave it hanging outside all the time if you like.

Gagneur, J., Elze, M.C., Tresch, A.: Selective phenotyping, entropy reduction and the Mastermind game. BMC Bioinform. (BMCBI) 12, 406 (2011)

strategy 4) Orange Orange Pink Orange Gives a white peg. So, we know the only unknown spot - the 3rd spot - has an orange color Storage & organisation Furniture Textiles Kitchenware & tableware Kitchens Lighting Decoration Rugs, mats & flooring Beds & mattresses Baby & children Smart home Bathroom products Laundry & cleaning Plants & plant pots Home electronics Home improvement Outdoor living Food & beverages Christmas Shop Shop by room Jäger, G., Peczarski, M.: Bounding memory for Mastermind might not make it harder. Theoret. Comput. Sci. 596, 55–66 (2015)

Unwanted Food or Drink Products - Once supply conditions are broken, there are a number of factors outside of our control that can affect the quality of a product. Therefore perishable goods such as food and drink cannot be returned. Chen, S.T., Lin, S.S.: Optimal algorithms for \(2 \times n\) AB games - a graph-partition approach. J. Inf. Sci. Eng. 20(1), 105–126 (2004)Jäger, G., Peczarski, M.: The number of pessimistic guesses in Generalized Mastermind. Inf. Process. Lett. 109(12), 635–641 (2009) Viglietta, G.: Hardness of Mastermind. In: Kranakis, E., Krizanc, D., Luccio, F. (eds.) FUN 2012. LNCS, vol. 7288, pp. 368–378. Springer, Heidelberg (2012) The next color we had information over was green - but as we know it's not the third spot, and the second and fourth spot is filled with blue & red, we know it's on the first spot. Note: If you know the exact amount of reds, you don't need to try the last location: if there's one red pin, and it's not in the first, second or third location, it has to be in the fourth). Jäger, G., Peczarski, M.: Playing several variants of Mastermind with constant-size memory is not harder than with unbounded memory. In: Kratochvíl, J., Miller, M., Froncek, D. (eds.) IWOCA 2014. LNCS, vol. 8986, pp. 188–199. Springer, Heidelberg (2015). doi: 10.1007/978-3-319-19315-1_17