Courts cannot decide outside pleadings

(Gajanan Krishnaji Bapat and Anr. v. Dattaji Raghobaji Meghe, AIR 1995 SC 2284; Kalyan Singh Chouhan v. C.P. Joshi, JT 2011 (2) SC 97).  It is not permissible for the court (and also arbitral tribunal) to travel beyond the pleadings

Unilateral mistake - misunderstanding scope of contractual obligations

Dhulipudi Namayya v. Union of India, AIR 1958 AP 533 and State of Andhra Pradesh v. Pioneer Builders, 1999 (3) ALD 140 which relied on Hillas & Co. v. Arcos Ltd., (1932) All ER 494.  Pioneer in Appeal  (AIR 2007 SC 113) reversed on other grounds. This was untouched.

Arbitration clause can survive even the settlement agreement

AIR 1990 Bom 45

exclusion of jurisdiction of indian courts

territorial  jurisdiction of a court when the plaintiff intends to invoke jurisdiction of any court in India, has to be ascertained on the basis of the principles laid down in the Code of Civil Procedure.  Agreement cannot take away jurisdiction of court.  (2008) 1 SCC 618

Fraud and Contract

Fraud which vitiates the contract must have a nexus with the acts of the parties prior to entering into the contract.
(2006) 13 SCC 599, Reliance Salt Ltd v. Cosmos Enterprises 

Limitation and Arbitration - Section 14

Benefit of Section 14 of the Limitation Act, 1963 is also available in arbitration proceedings. (2011) 1 SCC 117

Jurisdiction

The place where the repudiation is received is the place where the suit would lie. (1989) 2 SCC 163 ABC Laminart