♠KQxx
♥KQJx
♦-
♣QJ98xx
Your partner opens 1♥ (5+, max 15HCP playing precision, but I think the question is applicable to SAYC or 2/1, too).
2♠ from West (5+, weak, can be two suited with a minor)
#1: How is your evaluation of the hand? Is this hand suitable for a 4♦ splinter?
#2: Suppose you bid 3♠ instead (gf, usually with support for partner), how a 4♦ rebid by pard change your evaluation?
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Now try another one:
You are South, Dealer , E/W vulnerable
♠-
♥A1098xx
♦865432
♣A
#3 How is your evaluation of the hand? Do you open?
#4 Suppose you open 1♥. The bidding procedes:
1♥-2♠*-4♦**-X
*2♠ is 5+, weak, can be two suited with a minor.
**4♦ is splinter, 4+ ♥, 11/12+ HCP
How this bidding change your evaluation? What is your bid now?
P.S.: Yes, I know that it seems the same hand, but try not to be influenced by this fact.....

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