💡📝H. G. Muller wrote on Sun, Jul 19, 2020 08:21 AM UTC:
OK, so I could allowmoves and captures for the first move, and promotions, suicides and freedrops for the second (and perhaps third) move, depending on whether the game needs those. (Freedrops would only be needed when there participates a piece that uses an 'unload' modifier in its Betza notation, and suicides only when there are multi-leg moves that can capture on a non-final leg.)
The question is how the presence of suicides or freedrops in the input move is relayed to the post-move code so that it can check for their legality. For promotions it could just check 'space dest', because the basic input system already enforced that these could only alter the piece that just moved. But the freedrops and suicides could strike anywhere. Is there a variable similar to 'dest' that tells which location they altered, or must I make a copy of the board before the move to compare to afterwards, to see if anything was changed, and what?
Is the post-move code run after each move in the sequence, and then the post-game code at the end? But then I don't understand how the code in the tutorial can work, because promotion happens only in the second move, so that the first move should be flagged as illegal when you run the post-move code after it, because it still has the Pawn on last rank.
OK, so I could allow moves and captures for the first move, and promotions, suicides and freedrops for the second (and perhaps third) move, depending on whether the game needs those. (Freedrops would only be needed when there participates a piece that uses an 'unload' modifier in its Betza notation, and suicides only when there are multi-leg moves that can capture on a non-final leg.)
The question is how the presence of suicides or freedrops in the input move is relayed to the post-move code so that it can check for their legality. For promotions it could just check 'space dest', because the basic input system already enforced that these could only alter the piece that just moved. But the freedrops and suicides could strike anywhere. Is there a variable similar to 'dest' that tells which location they altered, or must I make a copy of the board before the move to compare to afterwards, to see if anything was changed, and what?
Is the post-move code run after each move in the sequence, and then the post-game code at the end? But then I don't understand how the code in the tutorial can work, because promotion happens only in the second move, so that the first move should be flagged as illegal when you run the post-move code after it, because it still has the Pawn on last rank.