If Opponents interfer with 1♣ by bidding 1♦
Double - Promises at least 4-4 in the majors
Pass - Same as 1♦ response
All other bids are the same and ignoring interference
Montreal Relay
System Summary
Openings
1♣ - 11-17, could open club with 5 card major if 18+ HCP and 5 clubs or 4-4-4-1 distribution
No-Trump Responses
Raise Once on 1 Major
1♦ - 11-17, 5+ card ♦ except 1=4=4=4, will open with a 5 card major 18+ HCP
1♥ - 11-17 5 card ♥ would not open with 5 spades as well.
1♠ - 11-17 5 card ♠ would not open with 5 hearts as well
1NT - 1st & 2nd Seat - 12 -14 HCP / 3rd & 4th Seat - 15-17 HCP
2♣ - 18 - 20 HCP and a balanced hand could have a 5 card major
Interference
2♦ - 18+ unbalanced or a 4 losing trick, or 21+ balanced
2♥ - Weak 6+ Hearts
2♠ - Weak 6+ spades
2NT - 5-5 in the Majors (10+ HCP)
4♣ - Namyats
4♦ - Namyats
Other Openings
3NT - 5-5 in the Minors 10+ HCP
Michael's Or Unusual NT Defence
1♦ over 1♣
Overcall
1NT Overcall
1NT Opponents Opening
Opponents bid 2 Suits
Suit Bid Over Opponent Opening
They Open 1♣
Doubles
Conventions
Constructive Jump Shift
XYZ or XY-NT
OGUST
Woosley
Lebensohl
Two-Way Drury
Defense
Convention Card