sequences on the layout - sometimes called 'auxiliary sequences', before playing them to the foundations in the correct sequence. Building in reverse sequence is known as 'packing'. Reserved packers Reserved packers combine the features of having a reserve of cards and also the ability to pack in reverse sequence before laying off to the foundations. Non-builders The aim of a non-builder is not to build suit sequences, but some other objective. In many of them the aim is to discard the entire pack or packs by pairing cards of the same rank or adding up to a given number. Open games In open games, the entire pack of cards is visible at the outset and continue to be visible throughout the game. These games require careful analysis (as in chess) to achieve success. Open games may be divided into: Open builders. A family of builders in which all the cards are faced at the start of play. Open packers. Likewise a family of packers in which all the cards are visible at the outset. Open non-builders. A branch of open patiences in which the aim is other than build suit sequences. Half-open games Half-open games are those which start 'closed' and become 'open' as the game progresses. They may be divided as follows: Half-open builders. These are games where the aim is to build up suit sequences without the help of packing in reverse order first. Unlike simple builders, there is no wastepile, but cards are added to the layout if they cannot be built until the game reaches a point where all the unbuilt cards are visible and the game becomes one of analysis. Blockades. A small family of builders named after British Blockade in which the cards are only available if there is no card below (or sometimes above) it. Planners. A large family of builders with a high skill level. Cards are played to the foundations or to several wastepiles, the top cards of which are always available to play. Half-open packers. These are packers where, during the course of the game, all the remaining cards eventually become visible. Spiders. A small family of games named after Spider Solitaire in which all the building takes place on the tableau and not to separate foundations. Computer games Patience and solitaire games have enjoyed a renaissance as a result of being readily transferable to a software format and playable