West isn’t strong enough to bid 3♥ .  

A Club or a Diamond are unsafe leads.  Best option is A♥  & partner should signal they like the lead by playing the 10.

Robin's comments on the bidding:

1. North is in the protective seat so is strong enough to bid 1NT but can’t without a Club stop. With 4-4 in the majors X is correct. With a 5-card H suit 1H would be the bid.
2. XX shows a strong hand wishing to compete. 2♣  would show a much weaker hand.
3. 1♥ South must take into account that North is in the protective seat & so should reduce his point count by 3 & so just reply at the 1-level. Note that although the Diamond suit is much stronger with 4 Hearts & 4 Diamonds you must bid the major. If S had passed then West must bid 2♣ .
4. 2♣  is likely to make & so South should compete with 2♥ .

1. 2♣  With 10 points it is better to show your strength, can show your 4 Hearts later.
2. 2♥ is a reverse & shows a strong hand which would be strong enough to cope if partner was to go to the 3-level to show suit preference for the Diamonds.
3. 4♥ Two factors reduce the strength of North’s hand – he is Aceless & he has a singleton in partner's suit. If he was to reply 3♥  this would be a strong reply, forcing to at least game (bidding has shown 25+ HCP’s), whereas 4♥  is a weaker bid showing a minimum hand.
4. South's final pass, may only have a 5 losing trick count but with a void in partner’s suit doesn’t continue.

Suggested opening Lead = 3S

1. 1♠  - don’t open 1NT with two weak suits.
2. 2♠ - 1NT would be acceptable, but 2♠ is better as the doubleton Club suit gives the opportunities for some ruffs.
3. West's final pass - Good hand with 6 Losing Trick Count, but not good enough to try for game.

Opening lead = K♦ 

1. 3♦  with 5½ losers, 6 Diamonds & 16 points, so a jump in Diamonds best describes your hand.
2. 3♠  3D isn’t a forcing bid, but you must strive to bid if at all possible.
3. 4♥  An 8-card fit, if partner is strong he will continue bidding.

1. 1♥  Only 11 HCP’s but a very good Heart suit.
2. East's first rebid -  Pass to show a weak hand. Partner will expect 11-12HCP, 5 Hearts & no Spade support.
3. 2♠ - With 6 Spades & 4 Diamonds rebid the Spades
4. 3♦ - Only 8 HCP’s, but they are all in two suits & a 7 LTC hand.  A Diamond bid now will show 6 Spades & 4 Diamonds. (With 5-4 you would have bid 2♦  rather than 2♠.

1. 1♠  -  Only 11 HCP but a good 5-card Spade suit & 7 LTC.
2. 3♠  -  Not forcing, shows 4 Spades & around 10 points.
3.  South's second round pass -  With 7 LTC & having opened light no reason to bid

10♣ is the best lead, but there is nothing wrong with J♠ .

1.  4♥  - 4 card support & 6 LTC
2. Double - 3 Heart tricks & the A♠ 

Opening Lead 10♦ , this gives nothing away

1. 1♥ - Don’t make Weak Jump Overcall (WJO) with 4 cards in the other major, must bid, hand is too good to pass.
2. 2♠ -  shows a very good hand & is forcing for one round.
3. Norths pass second time round  - With such a poor Club suit North should pass.
4. 4♠ -  6LTC & expects to be able to ruff Clubs in dummy.
5. O/L = AD, partner replies with 9D to show that he likes Diamonds.

Opening Lead - A♦ , partner replies with 9♦  to show that he likes Diamonds.

1. 4♠ - 7LTC, 13 HCP.

1.  1♥  - Only 10 HCP but good Heart suit & all points are working.
2.  4♦  -  Shuts out the opposition.
3.  North's first round pass - Without the interference bid North would have bid 1S even with only 3HCP.

Opening Lead - Q♥ 

1. 1♠  -  Open the higher ranking of two touching 5-card suits.
2. 2♦  -  9 HCP, but meets the Rule of 14 (If number of HCP + the number of cards in your longest suit is 14 you can respond at the 2-level).
3. 2♠  -  Suit preference.