Prism Signals
Some probably heard about prism signals, as some very advanced defence signals.
First word about it: something simple that is presented in a complicated way. You can find the book free on the net, guess the authors try to make them popular.
I will point the principles.
Their purpose is to find out the distribution of the whole hand. Everybody holds 13 cards, and there are 4 suits. Now in every suit there are also 13 cards. Some simetry...
13 is odd. Any four numbers that will add to 13 will be either 1 odd and 3 even, or 3 even and one odd. There is no other way.
Coming back to our game, you will have precisely one suit that has a distinct parity than the other three. They call that "single suit". When you defend, you can see 2 hands, yours and the dummy. Suppose your partner will tell you what is his single suit, and what is it's parity. That means you know the parity from all your partner's suit. Now that you know three parities, is simple to know the fourth hand's parity. If you know the parity, you can make up the distribution effectively. That will help in certain situations.
Now about the book. You don't need to know the rules about discovering what is the singular suit declarer holds, you don't need to know the type of prisms symetries, and others. They are all consequences, just rules so you don't have to make the additions yourself. I think one can get the distributions without all those rules fast enaugh since the adition rules involve mostly parity and are elementary.
The means to signal are simple in some situations and somewhat more difficult in others. My guess is it could be all presented pretty clearly in one or two pages.
Now about there usage, the stuff that matters. If you are not expert, they are not usefull. In order to use them, you should be accustomed to always count declarer's and partner's hand, follow signals, read them, and make deductive plays based on those information. That for me are attributes of expert players.
Otherwise, you can play them, they are not difficult to play, but you won't benefit from them. I think every pair shoud import the signals both players are able to follow and understand well.
About the book: a lot of expert defence problems and deals where you will find prism signals usefull. Now even if you're not interested in prism signals, the deals are certainly worth studying a bit.
First word about it: something simple that is presented in a complicated way. You can find the book free on the net, guess the authors try to make them popular.
I will point the principles.
Their purpose is to find out the distribution of the whole hand. Everybody holds 13 cards, and there are 4 suits. Now in every suit there are also 13 cards. Some simetry...
13 is odd. Any four numbers that will add to 13 will be either 1 odd and 3 even, or 3 even and one odd. There is no other way.
Coming back to our game, you will have precisely one suit that has a distinct parity than the other three. They call that "single suit". When you defend, you can see 2 hands, yours and the dummy. Suppose your partner will tell you what is his single suit, and what is it's parity. That means you know the parity from all your partner's suit. Now that you know three parities, is simple to know the fourth hand's parity. If you know the parity, you can make up the distribution effectively. That will help in certain situations.
Now about the book. You don't need to know the rules about discovering what is the singular suit declarer holds, you don't need to know the type of prisms symetries, and others. They are all consequences, just rules so you don't have to make the additions yourself. I think one can get the distributions without all those rules fast enaugh since the adition rules involve mostly parity and are elementary.
The means to signal are simple in some situations and somewhat more difficult in others. My guess is it could be all presented pretty clearly in one or two pages.
Now about there usage, the stuff that matters. If you are not expert, they are not usefull. In order to use them, you should be accustomed to always count declarer's and partner's hand, follow signals, read them, and make deductive plays based on those information. That for me are attributes of expert players.
Otherwise, you can play them, they are not difficult to play, but you won't benefit from them. I think every pair shoud import the signals both players are able to follow and understand well.
About the book: a lot of expert defence problems and deals where you will find prism signals usefull. Now even if you're not interested in prism signals, the deals are certainly worth studying a bit.
posted by Catalin at
6:54 AM
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