Conn. Practice Book § 10-50

No facts may be proved under either a general

or special denial except such as show that the

plaintiff’s statements of fact are untrue. Facts

which are consistent with such statements but

show, notwithstanding, that the plaintiff has no

cause of action, must be specially alleged. Thus,

accord and satisfaction, arbitration and award,

duress, fraud, illegality not apparent on the face

of the pleadings, infancy, that the defendant was

non compos mentis, payment (even though non-payment is alleged by the plaintiff), release, the

statute of limitations and res judicata must be specially pleaded, while advantage may be taken,

under a simple denial, of such matters as the

statute of frauds, or title in a third person to what

the plaintiff sues upon or alleges to be the plain -

tiff’s own.