Upside Down Count and Attitude
Some partnerships agree in advance to play UDCA. With this agreement, the standard count and attitude signals are inverted: when signaling attitude, a low card is encouraging and a high card is discouraging; when signaling count high-low shows odd count, low-high shows even count.
Many experienced players believe UDCA is superior to standard signaling. Most importantly, it is often easier for partner to read your signals. Also, you do not have to "waste" high cards in suits you like.
Caution: UDCA, as the name states, applies to count and attitude signals only. Suit preference signals are played standard. Also, your leads (as opposed to signals) are unchanged—you still lead high from a doubleton, for example, barring another special agreement to the contrary.
As mentioned above, standard count in the trump suit is already "upside down". Experts recommend that trump signaling be the same in UDCA as standard trump signaling, that is, when playing UDCA, signal the same in all four suits.
Read more about this topic: Signal (bridge)
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—James Dickey (b. 1923)
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—William James (1842–1910)