The parent variant is indeed the word on the ' Game:' line after the piece-to-char table. I don't think there are any standard variants with a 2-deep zone, for 8x8 boards or larger. In variant shogi it uses 1/3 of the board height, which works for the 6x6 Judkin's Shogi (which has a zone of 2 ranks).
With legality testing switched off, however, WinBoard would obey the engine when it plays a promotion move. That solves the problem in engine-engine games. In human-engine games it might work when you type moves that should promote, in this case.
The parent variant is indeed the word on the ' Game:' line after the piece-to-char table. I don't think there are any standard variants with a 2-deep zone, for 8x8 boards or larger. In variant shogi it uses 1/3 of the board height, which works for the 6x6 Judkin's Shogi (which has a zone of 2 ranks).
With legality testing switched off, however, WinBoard would obey the engine when it plays a promotion move. That solves the problem in engine-engine games. In human-engine games it might work when you type moves that should promote, in this case.