Dixon defence to Multi 2D

Dixon in second position

Over 2D

X Either 12-16 balanced or any 20+ hand
2H Takeout of spades with at least four hearts, NF
2S Takeout of hearts with at least four spades, NF
2NT 17-20 balanced
3suit 12-16, good six card suit
3NT To play
4C Strong major-minor 2-suiter
4D Strong major 2-suiter
4H/S To play
4NT Strong minor 2-suiter
5C/D To play

In response to 2D X

2NT Lebensohl

Doubler rebids naturally to show 20+

Any rebid after a response of 2H or 2S
Any rebid after a pass if responder to the multi bids
Any rebid except 3C over 2NT [Lebensohl]

In response to 2D 2H/S

2NT Lebensohl

Over 2D - 2H - -

X Penalties
2S Weak, natural
2NT Minors
3C/D That suit plus spades
3H 17-20, good six card minor, no H stop
3S 17-20, good six card spade suit
3NT 17-20, good six card minor, plus H stop

Over 2D - 2H - 2S or 2D - 2S - -

X Penalties
2NT Minors
3C/D That suit plus hearts
3H 17-20, good six card heart suit
3S 17-20, good six card minor, no S stop
3NT 17-20, good six card minor, plus S stop

Dixon in fourth position

Over 2D - 2H

X Takeout of hearts
Others Natural

Over 2D - 2S

X Takeout of spades
Others Natural

Over 2D - 2H - 2S - -

X Takeout of spades
Others Natural

A simpler defence in second position

Over 2D

X Either 12-16 balanced or any 20+ hand
2H/S Natural
2NT 17-20 balanced
3suit 12-16, good six card suit
Game To play

In response to 2D X

2NT Lebensohl

Doubler rebids naturally to show 20+

Any rebid after a response of 2H or 2S
Any rebid after a pass if responder to the multi bids
Any rebid except 3C over 2NT [Lebensohl]

Over 2D - 2H - - or 2D - 2H - 2S or 2D - 2S - -

X Weak takeout
2S Weak, natural
2NT Minors
3C Strong takeout
Note: this can be changed as you prefer for any combination of double, 3C and 3D to show weak or strong takeouts, or to include a penalty double.

A different approach in fourth position

Over 2D - 2H

X Shows hearts
3C Weak takeout of hearts
3H Strong takeout of hearts
Others Natural

Over 2D - 2S

X Shows spades
3C Weak takeout of spades
3S Strong takeout of spades
Others Natural

Over 2D - 2H - 2S - -

X Shows spades
3C Weak takeout of spades
3S Strong takeout of spades
Others Natural