A special form of wine tasting in which the quality of wines from a particular growing region for a particular vintage is usually determined by a professional wine evaluation (judgement) and wine talk (description). In this type of tasting, wines from the same vintage but from different producers and/or growing regions are compared with each other in order to determine stylistic, qualitative and vintage-related differences. The "horizontal" refers to the time axis (same vintage from different producers and/or growing regions) "from left to right".

Left: horizontal tasting - same vintage, different producers (time axis "from left to right")
Right: vertical tasting - different vintages, same producer (timeline "from top to bottom")
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