6 Requests a takeback of 'n' half-moves in the current game. If 'n' is
7 omitted then 1 is assumed. A "half-move" is defined as a move by one
8 player. To request that the last move made be changed (whether you were
9 the one to move last or your opponent moved last), you would request
10 "takeback". If you wanted to change the last move made as well as the move
11 prior to that, request "takeback 2".
13 Here's an example: suppose you are playing White and your opponent has
14 just placed a piece on a square where it can be easily captured, and you
15 capture it. Your opponent might realize the weak move he/she made and
16 request "takeback 2" so that he/she doesn't lose material so easily. If
17 you wish, you can accept the "takeback 2" request and continue the game
18 from the previous position in the game. Both moves would be reversed, and
19 it would be Black's move to make.
23 [Last modified: June 14, 1995 -- Friar]