second kind is referred to as an outward slide. The word "slide" is synonymous to the French word "glissement", which is occasionally also used in English literature. Subtleties Jeu-de-taquin slides change not only the relative order of the entries of a tableau, but also its shape. In the definition given above, the result of a jeu-de-taquin slide is given as a skew diagram along with a skew standard tableau having it as shape. Often, it is better to work with skew shapes rather than skew diagrams. (Recall that every skew shape gives rise to a skew diagram , but this is not an injective correspondence because, e. g., the distinct skew shapes and yield the same skew diagram.) For this reason, it is useful to modify the above definition of a jeu-de-taquin slide in such a way that, when given a skew shape along with a skew standard tableau and an addable cell as an input, it yields a well-defined skew shape along with a skew standard tableau at its output. This is done as follows: An inward slide of a skew tableau T of skew shape into a cell c is defined as above when c is a corner of (that is, when is a Young diagram), and the resulting skew shape is set to be where d is the empty cell at the end of the sliding procedure. An outward slide of a skew tableau T of skew shape into a cell c is defined as above when c is a cocorner of (that is, when is a Young diagram), and the resulting skew shape is set to be where d is the empty cell at the end of the sliding procedure. Generalization to skew semistandard tableaux Jeu de taquin slides generalize to skew semistandard (as opposed to skew standard) tableaux and retain most of their properties in that generality. The only change that has to be made to the definition of an inward slide, in order for it to generalize, is a rule on how to proceed when the (temporarily) empty cell has neighbours below and to its right, and these neighbours are filled with equal numbers. In this situation, the neighbour below (not the one to the right) has to be slid into the empty cell. A similar change is needed in the definition of an outward slide (where one has to choose the neighbor above).