When choosing to play a sequence as conventional, one must be aware of what is lost when a bid is no longer natural. It is common to play the sequence 1C-( 1H)- X as showing four spades and 1C-( 1H)- 1S as showing five, or more, spades. The problem with that arrangement can be seen in the hand shown. West does not have enough to bid 2D and, since 1C shows 2+ cards, a club raise is out of the question. Having no sensible bid, West has to pass for the moment and hope to re- enter the auction later. That happens safely here but if North had raised to 2H, which seems a better choice than 1NT, then the late re- entry at the 3 level might be less appetising. A safer treatment is to play double as not having four spades and 1S as showing 4+ spades. It is safer since it allows immediate entry to the auction, on all hands, and removes the danger of being shut out. Either of these would have allowed West to make a first- round bid and not be shut out by a North making the book raise to 2H. Not showing the 8 card fit stops South making any further contribution to the auction. For me, it is masterminding since North reserves all further decisions for himself. After North did not raise hearts, West could comfortably re- enter the auction with a double. East bid 2S and this contract, although makeable, proved too difficult at the table. After the KH lead and a club switch, East tried for a 3- 3 trump split and 5 diamond tricks but with the 4- 2 split, lost control and went one down when cut off from the last diamond by a late ruff. There was a much safer contract available and East might have reflected that West, playing the common version of this treatment, had not doubled 1H. East then knows that West does not have 4 spades and must, therefore, be offering a choice of contracts in the minors. With this inference, it is easy to bid 2D here ( or 2C if opener has some length there). If North belatedly raises to 2H, West will find a 3D bid and that contract will be made easily as the cards lie.