Sorry, Bill, but this is absolutely not true!
First, the “purist” and “practical” definitions are the same for simple moves, so let’s ignore that.
And let’s also ignore, for the moment, the case of promotion, because none of the editions exactly conforms to either your “purist” definition or your “practical” definition.
So the real situation is that in the 4th edition, the “purist” definition was used for castling, but the “practical” definition was used for captures (which, like it or not, was confusing). But in the 5th and subsequent editions, the “purist” definition is used for both.
Let’s examine the castling rule. In the 4th edition, it reads:
9C. Castling. In the case of castling, the move is determined with no possibility of change when the player’s hand has released the king, which has moved two squares toward a rook, and completed when that player, having transferred the rook to its new square, punches the clock.
In the 6th edition, this rule is almost identical:
9C. Castling. In the case of legal castling (8A2, 8C1, 10I1, 10I2), the move is determined with no possibility of change when the player’s hand has released the king, which has moved two squares toward a rook, and completed when that player, having legally transferred the rook to its new square, presses the clock (5H).
Note that the only differences in the wording of these two versions are (a) the inclusion of the words “legal” and “legally”, (b) the inclusion of references to other related rules, and (c) replacement of the word “punches” with “presses”.
In both versions, castling is “determined” at the moment when the player has released the king, but before the player has moved the rook, which corresponds to your “purist” version. So the 5th and 6th editions use the “purist” version for both castling and capturing, whereas the 4th edition used it for castling but not for capturing.
To determine whether the “purist” version or the “practical” version is best, we need to consider the purpose of the distinguishing between “determination” and “completion”. The term “completion” is intended to define the moment at which one player ceases to be “on move” and the other player begins to be “on move”. But it was felt that there needed to be a separate definition that did not depend on pressing (or “punching”) the clock button, but when the player was committed to a particular move (hence the wording, used in all 3 editions: “determined with no possibility of change”). The purpose was not to define the moment at which a move has been fully executed, but the moment at which the player is committed to a particular move.
And herein lies the complexity of the promotion rule, for there are really two parts to the move: the advancing of the pawn and the promotion. In the 4th edition, the rule reads:
9D. Pawn Promotion. In the case of the promotion of a pawn, the move is determined with no possibility of change when the pawn has been removed from the chessboard and the player’s hand has released the new piece on the promotion square, and completed when that player punches the clock. If the player has released the pawn on the last rank, the move is not yet determined, but the player no longer has the right to play the pawn to a different square.
In the 6th edition, it reads:
9D. Pawn Promotion. In the case of the legal promotion of a pawn, the move is determined with no possibility of change when the pawn has been removed from the chessboard and the player’s hand has released the new appropriate piece on the promotion square, and completed when that player presses the clock (5H). If the player has released the pawn on the last rank, the move is not yet determined, but the player no longer has the right to play the pawn to a different square. See also 8F6, Pawn promotion and 10H, Piece touched off the board.
Neither of these wordings corresponds exactly to either your “purist” wording or your “practical” wording. But the sense of both wordings is the same: The player is not committed to the entire move until the pawn has been removed from the board and the promotion piece has been released on the promotion square, but if he has released the pawn on the last rank, he has committed himself to that part of the move (i.e., moving the pawn straight forward or diagonally to capture a piece). And he is not committed to the choice of promotion piece until he has actually released the piece on the promotion square (i.e., simply touching a piece off the board, or even placing that piece on the promotion square without releasing it, does not commit the player to that choice of promotion piece).
What is very clear from the wording of 9D is that its purpose (and the purpose of all of the determination rules) is to define when the player is committed to a particular move, with no possibility of change. And this is precisely why the wording used in the 4th edition for Rule 9B is so unacceptable! There are, in general, two ways a player can execute a capture (capturing piece Y using piece X):
Scenario A:
- pick up piece X
- remove piece Y from the chessboard
- release piece X on the destination square
Scenario B:
- remove piece Y from the chessboard
- pick up piece X
- release piece X on the destination square
The 4th edition version of the Rule 9B states that “In the case of capture, the move is determined with no possibility of change when the captured piece has been removed from the chessboard and the player’s hand has released the capturing piece, and completed when that player punches the clock.” As worded, this implies that the moment at which the player is committed to his move is, in both scenarios, at the completion of step 3. But this contradicts Rule 10C (“Touching pieces of both colors”), which clearly indicates that, in both scenarios, the moment at which the player is committed to his move is at the completion of step 2. Your argument, as far as I can make out, is that this is perfectly okay because, since the rules contradict each other, it is clear that Rule 10C should prevail and Rule 9B should be ignored. My argument is that a more sensible approach was the one actually used: to modify the wording of Rule 9B so that it agrees with Rule 10C.
It is worth noting that the problem was really created by the invention of the distinct terms “determined” and “completed” in the 4th edition rulebook. The 3rd edition used only the term “completed”, and the meaning of the term did not agree with either the term “determined” or the term “completed” as these terms are used in the 4th and subsequent editions. In the 3rd edition, the term “completed” essentially meant that the move had been fully executed - not that the clock button had been pressed. But the rule for castling included the concept of determination (as it is defined today), and its application to castling was the same as it is now:
I.8. The Completion of the Move
A move is complete–
…
c. In the case of castling, when the player’s hand has released the rook on the square crossed by the king. When the player has released the king from his hand, the move is not yet completed, but the player no longer has the right to make any move other than castling on that side, if this is legal;
In the tournament game I described earlier, our confusion arose because we were trying to use rule I.8.B (which covered capturing) to decide when the capture was “determined” (in the sense that this term is now used), but rule I.8 was simply defining when a move had been fully executed, and it was really rule I.9.B.2 (the equivalent of the modern-day Rule 10C) that defined when a capture had been determined.
And this, I suspect, was the cause of the erroneous wording of Rule 9B in the 4th edition rulebook: They correctly modified the wording of the castling and pawn promotion rules (I.8.C and I.8.D) to properly utilize the new term “determination”, but failed to realize that the proper wording of the rule for “determination” with regard to capturing was not found in rule I.8.B, but in I.9.B.2. But, happily, this error was recognized and corrected in the 5th and subsequent editions.
Bob