Hilchot Berachot 4:9-10 (An additional beracha for a new type of wine)

If a group of people are drinking wine, and then a different type of wine is brought to the table, a new beracha is required – but not Borei Pri HaGafen. What is this beracha? Is it only said if the new wine is better than the first wine? Does it apply to a person drinking alone?