Another possibility for detecting a suicide move is to store the board position before the move into a variable, then compare the new position after the move to the stored position and see what differences there are.
This could potentially solve the problems of detecting a suicide move if I knew how to do it.
Here's a preset I made to demonstrate how to do this:
This records the position of every piece on the board in an array whose keys are coordinates and whose values are piece labels. It does this both before and after a move. It then goes through the current positions of pieces. For each empty space, represented with the @ piece, it compares it with the previous value to see if it was empty before. If it wasn't empty before, it records it as a capture.
Since I am already writing this, would the system used for the multi-move variants be able to handle moves with three or more parts (i.e. that of the Lion Dog in Maka Dai Dai Shogi)?
You could adapt it. For the multi-move variants, there are usually the same number of move parts each turn. So, it makes sense for these games to do the multi-part analysis globally for all pieces. But for games that include pieces with multi-part moves, you may want to reserve the multi-part analysis for specific pieces and tailor it to each piece that needs it.
Here's a preset I made to demonstrate how to do this:
https://www.chessvariants.com/play/pbm/play.php?game%3DChess%26settings%3Dspotcaptures
This records the position of every piece on the board in an array whose keys are coordinates and whose values are piece labels. It does this both before and after a move. It then goes through the current positions of pieces. For each empty space, represented with the @ piece, it compares it with the previous value to see if it was empty before. If it wasn't empty before, it records it as a capture.
You could adapt it. For the multi-move variants, there are usually the same number of move parts each turn. So, it makes sense for these games to do the multi-part analysis globally for all pieces. But for games that include pieces with multi-part moves, you may want to reserve the multi-part analysis for specific pieces and tailor it to each piece that needs it.