1.

Long suits bid by opponents

2.

An Ace of a suit if opponent may be void

3.

Suits that partner could have indicated during bidding but refused to do so

4.

Away from an Ace (underleading) in a long suit or one that declarer may hold the King

5.

Leading a singleton trump (unless you know partner has a long trump stack as passing your takeout double, or opponents made a high-level sacrifice with few honors - planning to cross-ruff, etc)

1.

Partner's bid suit, especially lead-directing doubles

2.

Suits where opponents' have weak holdings

3.

Passive lead when opponents' bidding shows:

A. 

Minimal strength

B.

Lack of strong side suit

C.

Declarer is strong but dummy is weak

D.

Lacking obvious lead

E.

Opponents' have a poor fit

F.

Solid Slam or Grandslam bid (as opposed to questionable ones)

4.

Aggressively lead suit/s to quickly take tricks when:

A. 

Dummy has a long suit likely to promote tricks

B.

Opponents' have extra values or showed slam interest

C.

Opponents' side suit is breaking evenly

5.

Lead trump (except with singleton) when:

A. 

 Opponents' have a misfit or mediocre fit

B.

Your side controls other suits (as when opponents sacrifice)

C.

Opponents' avoid Notrump

D.

Your side has a long trump holding (especially when making a penalty Pass)

6.

Lead short suit against suit contracts to develop ruffing tricks when:

A. 

Short in unbid suits

B.

Long in opponents' side suit (allowing partner to ruff)

7.

Consider Forcing Leads when:

A.

Opponents' do not have a strong trump fit, such as a 4-3 fit.

B.

Opponent's have 4-4 trump fit, while defenders have  a 4-1 trump distribution.

C.

Declarer hold a two suited hand.

D.

Defenders have a long suit/s which force declarer to ruff.

1.

If partner does not hold honors, lead to preserve possible tricks based on own holdings

2.

If partner has useful honors, lead to finesse dummy

3.

If holding strength in Dummy's suit which is likely to be finessed, lead aggressively

4.

If holding strength is declarer's suit likely to finesse Right Hand Opponent, consider a passive lead

1.

Suit bid or implied by partner double (takeout, lead directing, Lightener Doubles)

2.

Top of honor sequence from a 4+ card suit (but not a 4 card suit with 1 honor or 2 intermediate honors)

3.

A 5 card suit with useful entries, particularly honor in suit

4.

Suits inferred by partner's pass (where another suit could have been implied with takeout, lead directing, Lightener Doubles)

5.

Without useful entries in long suit, lead another suit helpful to partner (opponent's unbid major, especially suits with honors)

6.

Against Gambling 3 Notrump, lead an Ace

1.

Suit bid or implied by partner double (takeout, lead directing, Lightener Doubles)

2.

Top of honor sequence, especially shorter suits

3.

Short suit, especially a singleton (assuming non-honor ruffing power)

4.

Long powerful non-trump suits, forcing lead exhausting opponents trump when:

A.

Holding 4+ trumps

B.

Declarer has a two suited hand

C.

Opponents' do not have a fit (4-3 trump)

5.

Suits inferred by partner's Pass (where another suit could have been implied with takeout, lead directing, Lightener Doubles)

6.

Trump lead when Dummy will likely ruff or develop tricks through crossruffing

7.

Trump lead when partner converts a Takeout Double to a Penalty Pass, implying a long trump holding

8.

Aggressive leads (as unsupported honors) when Dummy has a long suit

9.

Ace from a doubleton

10.

If none of the above, make a passive lead

1.

King from touching honors

2.

Use caution leading an Ace from a suit if opponent may be void

Lead versus Suit

A x through x x

High

High

A x x, A 10 x

Low

Ace

A Q x, A J x

Middle

Ace

A K x

K Q x, Q J x, J 10 x, 10 9 x

High

High

K J x, K 10 x, Q 10 x

Low

Low

K x x, Q x x, J x x, 10 x x

Low

Low

x x x

High

MUD, etc

A K 10 x, A K x x, K Q x x

High

High

A K J x, A K 10 9, K Q x x

Low

King

A Q J x, A J x x, A 10 x x, A x x x

Low

Ace

A J 10 x, A 10 x x

2nd Best

Ace

K Q J x, Q J 10 x, J 10 9 x, 10 9 8 x

High

High

K Q 10 x, Q J 9 x, J 10 8 x, 10 9 7 x

High

High

K J x x, J 10 x x, Q 10 x x

Low

Low

K x x x, Q x x x, J x x x, 10 x x x

Low

Low

Q J x x, J 10 x x, 10 9 x x

Low

Low

A K J 10 x

Ace

-

A K J x x

King

-

A J 10 9 x, A J 10 8 x, K J 10 9 x,
K J 10 8 x

2nd Best

-

A J 10 x x, K J 10 x x

2nd Best

-

A 10 9 x x, K 10 9 x x, Q 10 9 x x

Low

-

K 10 9 8 x, K 10 9 7x , Q 10 9 8 x,
Q 10 9 7 x

2nd Best

-

K Q J 10 x, K Q J 9 x, Q J 10 9 x,
Q J 10 8 x

High

-

K Q J x x, K Q 10 x x, Q J 10 x x,
J 10 9 x x

High

-

K Q 10 9 x, K 10 9 7 x, Q 10 9 8 x,
Q 10 9 7 x

2nd Best

-

K 10 9 8 x, K 10 9 7 x, Q 10 9 8 x,
Q 10 9 7 x

Low

-

10 9 8 7 x, 10 9 8 6 x, 10 9 7 6 x

High

-

J 10 8 x x, 10 9 8 x x, 10 9 7 x x

Low

-

J 10 9 8 x, J 10 9 7 x, J 10 8 7 x

High

-