Bridge & other card games/Bridge
1. If your partner overcalls (an opening bid of 1 C) with 7-17 points and bids 1 D, can you respond 1 H (a new suit) with less than 13 points and a 4 card suit? This appears to have similarity to an opening pre-emptive bid (weak 2) of 2 hearts (with 6 of them) and 6-10 points and partner(responder) wishes to bid a new suit. I've been told partner in this case must have 13 points. Do you agree? If so, what if this person wishes to bid 2 of a new suit? Would that require 17 points?
2. In overcalling is 5 only instead of 6 cards required? There appears to be a difference of opinion and I'd appreciate your advice.
If partner overcalls 1C with 1D then in order for you to bid 1H you should have at least 8-9 points and a five card suit. With 10-11 you may bid 1H with a good 4 card suit since partner is allowed to have four hearts even after his 1D overcall. However, you need greater strength to respond to a one level overcall than you need to respond to a one level opening bid since partner is allowed to be much weaker.
To overcall at the one level, only a five card suit is required. To overcall at the two level you should generally have a six card suit although a five card suit with 3 of the top 4 honors is acceptable but could be a bit risky.