|Cheapest bid over the overcall||2 aces|
|Second-cheapest bid||3 aces|
|Third-cheapest bid||4 aces|
If playing Roman Key Card Blackwood, the responses are:
|X||0, 3 or 5 keycards|
|Pass||1 or 4 keycards|
|Cheapest bid over the overcall||2 keycards without the trump queen|
|Second-cheapest bid||2 keycards with the trump queen|
If partner bids 4NT followed by 5NT, he is making a Blackwood query for kings. All other rebids by partner are natural signoffs.
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