On this hand the majority in the poll (spade shift) got it right. Partner has AJ7x, (I think), and while a spade might "blow a trick" on honor position, it gains it back from promoting the 4th spade, holding the contract to 7 tricks. All other plays let it make 8 tricks, so it does not really blow a trick at all. Partner was 4333. I shifted to a diamond.