Editing 500 (card game) (section)

==Bidding conventions ==
Similarly to [[bridge (card game)|bridge]] there are possible [[bidding convention]]s in 500. It is considered standard to bid 6NT whenever one holds the joker.<ref>{{Cite web|title=The card game of 500 According to Francis: Traditional calling|url = https://www.play500.com/oldway.html|quote = Strangely enough most players have been taught to call the joker, by calling six no trumps if you hold that card, and this regardless of any other strengths in that hand. |access-date = 2024-01-24|author = Bryce Francis}}</ref><ref>{{Cite web|url=http://www.csse.monash.edu.au/~andyb/500.html|quote=A key piece of information is the location of the Joker.  It is common to bid six No-trumps if you hold the Joker.|title=How to play 500|author = Andrew Blucher|access-date = 2024-01-24|archive-url=https://web.archive.org/web/20080501144119/www.csse.monash.edu.au/~andyb/500.html|archive-date=2008-05-01}}</ref>[[John McLeod (card game researcher)|John McLeod]] states it is allowed in [[Saint Paul, Minnesota]] to bid "no trumps" (for instance 6 no trumps) if one holds strong cards and "no" (for instance 6 no) when one holds the joker or two jacks of opposite colors (red and black).<ref name="Pagat"/> Two jacks of opposite colors ensure that the partnership will hold one of the three highest trumps regardless of suit chosen.

It is standard to open 6 in a suit with good suit and 7 or 8 with better hand.<ref>{{Cite web|author = Bryce Francis|url = https://www.play500.com/oldway.html|title = The card game of 500 According to Francis: Traditional calling}}</ref> Some propose that opening 6 should indicate an ace or king in the suit and that rebid should indicate good suit for play.<ref name = "How to play 500">{{Cite web|url = http://www.csse.monash.edu.au/~andyb/500.html|title = How to play 500|author = Andrew Blucher | archive-url = https://web.archive.org/web/20080501144119/www.csse.monash.edu.au/~andyb/500.html|archive-date = 2008-05-01}}</ref> Openings 6{{spades}}/{{clubs}}/{{diamonds}}/{{hearts}} can be bluffs in order to bid misère when auction reaches the level 7.<ref name = "How to play 500"/>

[[Bryce Francis]], who authored a book on 500, proposed a very advanced bidding system for more elaborate version of 500 with bidding after pass and raising the bid by the winner allowed. In his system opening 6{{spades}} shows the ace of spades.<ref name="Better calling">{{Cite web|url = https://www.play500.com/calling.html|author= Bryce Francis|title = The card game of 500 According to Francis:Calling}}</ref> 6{{clubs}} shows the ace of clubs and lack of the ace of spades etc.<ref name = "Better calling"/> 6NT shows the joker but lack of aces.<ref name = "Better calling" /> Openings 7{{spades}}/{{clubs}}/{{diamonds}}/{{hearts}} show good suit but lack of aces and the joker.<ref name = "Better calling"/> Opening 7NT shows strong hand but lack of aces and the joker (for instance 4 kings).<ref name = "Better calling"/>

The responder shows aces as well.<ref name = "Better calling"/> To show a good suit which hasn't been bid one needs to jump bid it.<ref name = "Better calling"/> For instance 
: 6{{hearts}} – ? 
:: 6NT – joker,
:: 7{{spades}} – the ace of spades but lack of the joker, 
:: 7{{clubs}} – the ace of clubs but lack of the joker and the ace of spades,
:: 7{{diamonds}} – the ace of diamonds, but lack of the joker and other aces, 
:: 7{{hearts}} – good hearts but lack of the joker and aces, 
:: 8{{spades}} – good spades but lack of the joker and aces etc.

Showing aces can commence also after opening at the level of 7.<ref name = "Better calling"/>

In the Francis' system it is also possible to show kings and even queens and jacks.<ref name = "Better calling"/> Kings can be shown by bidding no trumps in the second round of auction. For instance in the following auction 
{|class="wikitable"
|Left opponent
|Partner
|Right opponent
|Player
|-
|6{{hearts}}
|6NT
|7{{spades}}
|7{{clubs}}
|-
|Pass
|7{{diamonds}}
|Pass
|?
|}
7NT now by the  responder shows the king of diamonds.<ref name = "Better calling"/> It is because the opponents had shown the aces of hearts and spades, partner showed the joker and the ace of diamonds. 7NT now shows the king of diamonds and potential possibility to play no trumps with diamonds as the source of tricks. 8{{diamonds}} would show good diamonds but lack of {{diamonds}}K. 7{{hearts}} would show good hearts etc.