Changes

a) * piece placement: similar to chess. Use x/X for dark Jeiqi pieces. For example, b) * captured pieces: all revealed captured pieces and their numbers, enclosed by brackets []. This part appears immediately after the first part, without any space. Pieces with no capture are ignored. Jeiqi pieces are not compulsory since we can calculate them from the board and revealed captures. That can make the FEN string a bit shorter, avoid redundancy and inconsistent data, avoid ugly using due to 2 -digit numbers (Jeiqi pieces could be 15 - two-digit numbers). Empty brackets could be omitted too. Pieces can be placed in any order. For being beautiful, it is suggested to list all-white pieces first, descending by piece values. For examples,

[C1H2P3r1p3]: white White loses 1 Cannon, 2 Horses, 3 Pawns, 1, black . Black loses 1 Rook, 3 Pawns

xxxxkxxxx/9/1x5x1/x1x1x1x1x/9/9/X1X1X1X1X/1X5X1/9/XXXXKXXXX w - - 0 1

2e6/4k4/9/2Ha1P2p/2a2P3/9/3p5/4E4/e8/2X1K4[R1C1P1X7r1h1p1d6] w - 3 55

The traditional move notation uses column number by side as an image. We can use them as Xiangqi with some notes:* revealing Revealing move uses promotional symbol: P1+1=h* Don’t count dark Jeiqi pieces with revealed don’t use Jeiqi symbol (X) but their fake pieces of the same types . That is just for solving ambitious cases. For example, if the move is written as “x9.1=c” we don’t know if that is a move of a fake Pawn or a fake Rook at column 9. However, “r9.1=c” says clearly the fake Rook at column 9 moved and revealed into a Cannon. The dark move of a Jeiqi piece and a revealed pieces one can be easily distinguished by checking if they are revealing symbol* . For example, even if there are two black Rooks in is a Rook at column 9advanced 1, their moves can not it’s move should be ambiguous since r9“r9.1 is definitely by revealed Rook and r9.1=c is definitely by the dark one1”.

Inform a engine it can play Jeiqi variant:

'''bestmove:''' as typical but it could not have a revelational piece even the moving piece is a dark Jeiqi one. Reason: the engine cannot decide that about revealed piece: