Alik1974, on 2013-April-28, 19:01, said:
Partner should have a 6-card ♠ to bid, otherwise he might pass with only 5 ♠ and 2 or 3 low ♥.
He should have a void in declarer's minor or he would have led a singleton in that minor.
His most probable distribution is therefore 6-3-4-0 or 6-3-0-4.
As Codo said, cashing a second ♠ will allow partner to signal his void.
Two ♠, ♦A and a ruff should be OK for one down.
♣9
A singleton lead would certainly have looked more attractive to West after this bidding, so West has a void in a minor.
In the critical case where South is void in diamonds and West void in clubs you have no diamond ace coming and cashing a second spade lets the contract make.
In this case you need to switch to clubs immediately.
Declarer can not be void in clubs because partner would not have bid 2
♠ with a diamond void and a good club suit, neither would he pass 4
♥.
Declarer is marked with the ace of clubs.
A club switch looses only if partner has specifically
♠JT8532
♥xxx
♦-
♣JT83
I bet against this and I am not sure he would bid that way with a six card spade suit and void at all white.
Why partner can not have a five card spade suit escapes me. But in this case he must be void in clubs and declarer void in diamonds.
Lead
♣9 at trick 2
Partner should have made your defense easier by leading an alarm clock signal. The
♠J is not a good card, no matter what this spade holding is.
A high spade spot card lead might hint at a diamond switch, while the lowest spade might indicate a club preference.
Rainer Herrmann