Summary

Cavendish The Laws and Principles of Whist Stated and Explained…

The Grand Coup consists in throwing away a superfluous trump. At the first glance it appears impossible to have a superabundance of trumps; but cases sometimes happen where a player has a trump too many. To get rid of this trump—as by undertrumping a trick already trumped by your partner, or by trumping a trick which he has won, or which you know he may win—is to play the grand coup.
Source: Gutenberg

Cavendish The Laws and Principles of Whist Stated and Explained…

It is dangerous to unguard an honour, or to blank an ace; and, also, to discard a single card when the game is in an undeveloped stage, as it exposes your weakness almost as soon as the suit is led. But, when you see that there is a probability of strength in trumps on your side, direct your partner to your strong suit by all the means in your power, and unhesitatingly unguard an honour, or throw a single card. Of course, if strength in trumps is against you, these are the very last cards you should think of throwing away.
Source: Gutenberg

Cavendish The Laws and Principles of Whist Stated and Explained…

The situations in which it is most necessary to refuse to overtrump your right-hand adversary, or to refuse to trump a winning card, occur when you have four trumps and a very strong suit, or a suit established early in a hand. For then, by trumping, you prejudice your chance of bringing in the suit in order to secure one trick. By refusing to part with a trump in these cases, you obtain the advantages just enumerated, at the time when they are most likely to become of service; and, where you refuse to overtrump, your adversary is left with one trump less, by which your hand is strengthened.
Source: Gutenberg

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