one regarding the Lord's Supper and "the essential (the real) presence of Christ," they could not agree.

Luther taught a real, physical presence of Christ at the Lord's table; Zwingli taught only a spiritual presence in the faith of the believer. How did Calvin's teaching fit between and modify both of these views?

Both the Roman Catholic and Lutheran insistence upon the physical body and blood of Christ being present in the bread and wine is based upon Jesus' words when instituting the Lord's Supper, as follows: "Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is My body. And He took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it; for this is My blood of the New Testament, which is shed for many for the remission of sins" (Matthew 26:26-28). (See also Mark-14:22-24; Luke 22:19-20; I Corinthians 11:23-25.)

The Calvinistic/Reformed/Presbyterian spiritual interpretation of these verses disagrees with the Roman Catholic/Lutheran

And as they did eat, Jesus took bread, and blessed, and brake it, and gave to them, and said, Take, eat: this is My body.
And He took the cup, and when He had given thanks, He gave it to them: and they all drank of it.
And He said unto them, This is My blood of the New Testament, which is shed for many.

-Mark 14:22-24

And He took bread, and gave thanks, and brake it, and gave unto them, saying, This is My body which is given for you: this do in remembrance of Me.
Likewise also the cup after supper, saying, This cup is the New Testament in My blood, which is shed for you.

-Luke 22:19-20

For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which He was betrayed took bread:
And when He had given thanks, He brake it, and said, Take, eat: this is My body, which is broken for you: this do in remembrance of Me.
After the same manner also He took the cup, when He had supped, saying, This cup is the New Testament in My blood: this do ye, as oft as ye drink it, in remembrance of Me.

-I Corinthians 11:23-25