In Gemara Berachot 39a, the text explores the laws of blessings, specifically focusing on a dry piece of bread that has been soaked in a bowl. The ruling presented is that one must recite the blessing of Hamotzi Lechem Min Haaretz over such a piece. However, the text notes that this appears to conflict with the view of Rav Chiya, who maintains that the blessing of Hamotzi should ideally be recited over a whole loaf of bread. Since the soaked piece is clearly broken, it stands in opposition to his requirement for wholeness.
The commentary of Tosafot analyzes this difficulty by questioning the exact circumstances of the case. If a whole loaf is present alongside the broken pieces, the established rule is that everyone agrees the whole loaf is superior for the blessing. Conversely, if only broken pieces are available, there should be no dispute at all. Previous discussions conclude that even small pieces require the blessing of bread, provided they retain the identifiable appearance of bread. Therefore, if no whole loaf is available, there would be no reason for anyone to suggest that the blessing should not be recited. This leaves the scholars to wonder what exactly the point of contention is.
To resolve this, the discussion suggests a specific scenario where both a whole loaf and a broken piece are present, but the individual prefers the broken piece. This preference creates a tension between the physical wholeness of the loaf and the subjective importance of the preferred item. According to Rav Chiya Bar Ashi, the fact that a piece is preferred gives it a status comparable to a whole loaf, and one may therefore recite the blessing over it despite it being broken.
However, Rav Chiya himself takes a stricter view. He maintains that the blessing must conclude while the bread is still whole. In his view, the requirement is that the blessing and the breaking of the bread must be synchronized such that the bread is intact when the blessing finishes. Since the soaked piece was already broken before the blessing even began, it cannot fulfill this requirement. Therefore, as long as a whole loaf is available, it must take precedence regardless of which piece the person prefers.
Ultimately, the dispute is limited to a situation where a choice exists between a whole loaf and a preferred broken piece. If no whole loaf is present and only pieces remain, all authorities agree that the blessing of bread is recited over those pieces. The logical distinction rests on the priority of wholeness when it is an option, versus the fundamental requirement to acknowledge bread as the source of the blessing when no whole loaf is available.