In card game Hand, Knee & Foot can you discard a red three?

And, why would this question be posted in the sewing machine category?

Hand and Foot Canasta card play here:

http://www.rummy-games.com/rules/hand-and-foot-canasta.html

Have fun!

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not if it causes either partner to go out in that hand/set and
also no individual can use discards unless a meld has first been preformed

No.

Here are the rules as per the Bicycle Paying Card Company:

The Pack The standard 52-card pack is used.
Object of the Game To lay matched number sets of 3 or 4 and/or sequences of 3 or more cards of the same suit to be the first player to obtain 500 total net points.
Rank of Cards
Ace (high or low), K, Q, J, 10, 9, 8, 7, 6, 5, 4, 3, 2, A.
Card Values/Scoring Score points by laying down and laying off cards as in regular Rummy, in matched number sets of 3 or 4, and in sequences of 3 or more cards of the same suit. For example, three or four 7s can be laid or a sequence of 3, 4, 5 of diamonds can be laid.
When any player gets rid of all his cards, the play immediately ends. Each player's score is then figured as follows: The player is credited with the point value of all cards that the player has showing on the table. From this figure is subtracted the point value of all cards remaining in his hand. The difference is added or subtracted from the player's score.
For example: If the cards showing for a player total 87 points, and the cards left in the player's hand total 90 points, 3 points are subtracted from the player's previous net score.
The first player whose score reaches +500 wins the game and collects from each opponent the difference between their final scores. If two or more players reach 500 on the same hand, the one with the highest score is the winner.
The Deal Deal seven cards to each player (except in the two player game, in which each player receives 13 cards). Place undealt cards face down in the center of the table, forming the stock. The top card is turned face up and is placed beside the stock as the up card to start the discard pile. The discard pile should be slightly spread, so that players can readily see all the cards it contains.
The Play Each player, beginning with the player to the left of the dealer, may draw either the top card of the stock or any card from the discard pile.
There are two conditions when drawing a card from the discard pile: 1) the player must take all the cards above the selected card and 2) the drawn card must immediately be used, either by laying it down in a set or by laying it off on a set already on the table. The remaining cards taken with the discard may be melded in the same turn or simply added to the player's hand.
Each player in turn, after drawing but before discarding, may lay down any matched set or may lay off any card that matches a set already on the table.
Cards that are laid off are kept on the table in front of the player. Sequences may not "go round the corner"; thus, A, K, Q or A, 2, 3 may be melded, but not K, A, 2. - See more at: http://www.bicyclecards.com/how-to-play/500-rum/#sthash.1oRfJip8.dpuf

You can either put it in your hand, and discard some other card, or you can keep your current cards, and discard the card that you just picked up.

From Wikipedia: The cards are shuffled and each player receives eight. The rest of the deck becomes the draw pile. The top card in the draw pile is turned over and placed face up next to the draw pile to form a discard pile. The upper card of the discard pile is called the Leading Card. The youngest player goes first. Starting clockwise, each player discards a card (or cards) onto the leading card, by (a) matching its color; or (b} matching its number or figure; or (c)using a SuperTaki, Switch Color, or Crazy Card. A player who cannot play draws one card from the draw pile. It may be used only in the next round. A player who is left with one card in his hand must announce "Last card!" If he fails to do this before the next player made his move, he draws 4 cards from the draw pile. The game ends when the first player has discarded his last card.

1. One player is chosen to be the dealer,who shuffles the deck and deals out a hand of 10 cards
2. one at a time and face down, to each player
3. Players hold their 10 cards in hand, so that other players cannot see them.
4. The remaining deck is placed face down in the center of the play area, to become the draw pile.
5. The top card of the draw pile is turned over and placed next to the draw pile, to become the discard pile.
6. Play begins with the player to the left of the dealer, and progresses to the left.
7. In turn, a player draws one card-either the top card from the draw pile or the top card from the discard pile-and adds it to the player's hand.
8. The player ends the turn by discarding one card of choice onto the discard pile.
9. Play of the first hand begins, with each player trying to complete the first Phase of the 10 Phases. Each player can make only one Phase during the game

Go to this site for more details : http://www.centralconnector.com/GAMES/phase10.html

You can get the instructions on the lins below, There is two types of Skip bo games.

http://www.mattelgames.com/rules/skipbo(eng).pdf

http://www.mattelgames.com/rules/skipbodelux.pdf

I think what you mean is that it lifts the foot. That is what its supposed to do. Some of the older ones it could be used for a speed control (30-40 years ago).The knee BAR is there to lift the foot for you so you can turn fabric etc. without having to reach behind and lift it. It acts as a third hand. You must have a foot control which plugs into the small hole on the right side of the machine.
Hope I helped.