Walsh convention

:"See Contract bridge glossary for an explanation of unfamiliar words or phrases."

Walsh is a convention-in the playing card game called Bridge—used in response to an opening bid of 1♣.The convention has its origins [http://www.bridgehands.com/W/Walsh_Diamond_Responses.htm] in the Walsh system invented by Richard Walsh, also known as Western Scientific; although the original version is little played as described today, at least in the UK.

In general it is not used by players of Acol, but is more commonly employed in 5 card major systems; especially those that use a prepared club, rather than better minor. The opening bid of 1♣ will therefore have shown either clubs or a balanced hand.

When responder is too weak to force to game diamond suits are bypassed in favour of major suits, regardless of the length of the diamond suit.For example holding:

*BridgeHandInline|AJ72|J743|KT6542|8

the response to the opening bid of 1♣ would be 1♠ rather than the normal 1Diams.

Continuations vary according to other details of the system being played. If Checkback Stayman is being played, then the auction 1♣ 1♠ 1NT 2Diams would show this hand and end the auction. If New minor forcing is being used then 3Diams; is used as the sign off bid instead.

When the values to force to game are held, the procedure is abandonded, and suits are bid in the normal order. Responders reverse from diamonds into a major thus becomes game forcing. So holding:

*BridgeHandInline|AJ72|AK43|KT6542|8

the auction starts 1Clubs 1Diams 1NT 2Spades

The main reason behind the convention is to avoid missing major suit fits when opener has something akin to a weak no-trump, and would rebid 1NT over the normal 1Diams response. The major suit fit is likely to provide a safer resting place when the hands are weak, as well as potentially scoring better (a concern perhaps only at matchpoints).

It is a form of Canapé and thus the responses of 1Hearts and 1Spades to a 1Clubs opener are alertable in the UK under EBU regulations.