| You must always bear in mind the vulnerability when deciding how high to overcall. |
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| If someone offers to declare, a later player may overcall by offering to reveal, in which case the first may raise his call to a revelation. |
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| It is also possible to overcall a contract with a similar contract in which hearts are trumps. |
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| The bid of abundance in trumps is only used to overcall another player's bid of abundance. |
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| The main difference between Acol and Standard American, when it comes to competitive bidding, is the Intermediate Jump overcall. |
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| At the one level a major suit overcall may be made on a four-card holding of exceptional quality. |
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| This means that there is no advantage in bidding solo 9, 10, 11 or 12 except to overcall another bidder. |
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| Each player in turn has one opportunity to bid at least three tricks using a named trump or to overcall a previous bid. |
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| Thus, two no trump will overcall a bid of two in any suit but may be overcalled by three clubs or any higher bid. |
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| After West passed and North opened one diamond, East made a crazy weak jump overcall. |
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| When your opponent asks for an explanation of a no-trump overcall, state that your partner has ten to fifteen points, the bid is artificial, and it is for takeout. |
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| While you might normally raise with your hand, just calling may encourage the players behind you to overcall when they would have folded to a raise. |
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