Deductive Blind Tasting
Use one grid, every time
Blind tasting is controlled deduction. Sight: clarity, intensity, colour, rim variation, tears, sediment, gas. Nose: condition, intensity, development, and aroma families (fruit, floral, herbal, spice, oak, earth, reductive). Palate: sweetness, acidity, tannin, alcohol, body, mousse, flavour intensity, finish length, complexity. Then conclusions: quality, age, grape, climate, origin.
Deduce in order
Structure before flavour. High acid with low tannin and pale colour suggests a thin-skinned grape; high tannin with high alcohol suggests a thick-skinned red from a warm site. Then read climate from balance: high acid, lower alcohol, fresh fruit and herbal notes say cool; lower acid, higher alcohol, riper or jammy fruit and sweet spice say warm. Then origin style - restraint, savouriness and earth lean Old World; forward fruit and sweet oak lean New World. Only then name grape, region and vintage.
Traps
Do not lean on a single aroma and jump to a grape. Distinguish oak (vanilla, toast, sweet spice) from lees (bread, cream) and from reduction (struck match). High alcohol is not sweetness; bitterness is not acidity. Pale colour is a grape trait as much as an age signal - Nebbiolo, Gamay and Pinot Noir stay light. Bottle-age notes are not the same as oxidation.
Worked example
Pale ruby, high acid, fine low tannin, red cherry and forest floor, moderate alcohol: cool-climate Pinot Noir, most likely Burgundy. Had the fruit been confected and the oak sweet, you would shift the origin rather than the grape.