Uncontested auction, starting on your left
1♦ - 2♣
2♦ - 2♥
2♠ - 3NT
1♦ = in an artifcial 5CM/strong club system (min balanced, or diamonds, or clubs, may not have any diamonds)
2♣ = artificial game force, usually no 5-card major
2♦ = 11-13 balanced (may still have a 5-card minor)
2♥ = major suit enquiry
2♠ = no four card major
So LHO has a minimum balanced hand with no major
RHO has a game force with (at least) one four-card major and nothing else he wants to ask about

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