COMPLETE ORIGINAL XIANGQI PRACTICE POSITIONS
Fixed Red-side files a-i,ranks0-9.All unlisted intersections empty.

S01 Red just before crossing
Side to move: r
Pieces: e0 rG, e4 rS, f9 bG
Proposals: e4-e5, e4-f4
Answer: Only the forward crossing is allowed of these two proposals.
Explanation: Red has not crossed on rank4;rank5 is the other bank.Sideways permission begins from the crossed position,not before it.
FEN: 5k3/9/9/9/9/4P4/9/9/9/4K4 w - - 0 1

S02 Red after crossing
Side to move: r
Pieces: e0 rG, e5 rS, f9 bG
Proposals: e5-e6, e5-f5, e5-e4
Answer: Forward and sideways pass;retreat fails.
Explanation: All proposals start from the same original board.Red increases ranks for forward;the step to rank4 is retreat.
FEN: 5k3/9/9/9/4P4/9/9/9/9/4K4 w - - 0 1

S03 Black just before crossing
Side to move: b
Pieces: e0 rG, e5 bS, f9 bG
Proposals: e5-e4, e5-d5
Answer: Black crosses by decreasing the rank.
Explanation: Black rank5 is not crossed;its forward step is to rank4.Sideways d5 is unavailable here.
FEN: 5k3/9/9/9/4p4/9/9/9/9/4K4 b - - 0 1

S04 Black sideways capture after crossing
Side to move: b
Pieces: d4 rH, e0 rG, e4 bS, f9 bG
Proposals: e4-d4, e4-e3, e4-e5
Answer: Black can capture on d4 or advance to e3;it cannot retreat to e5.
Explanation: Rank4 is crossed for Black.Capture uses the same one-step movement,with no diagonal pawn-capture rule.
FEN: 5k3/9/9/9/9/3Np4/9/9/9/4K4 b - - 0 1

S05 Red on the last rank
Side to move: r
Pieces: a9 rS, e0 rG, f9 bG
Proposals: a9-b9, a9-a8
Answer: The soldier can step sideways;it cannot retreat.
Explanation: Forward would leave the board.Sideways remains possible;there is no promoted replacement piece.
FEN: P4k3/9/9/9/9/9/9/9/9/4K4 w - - 0 1

S06 Sideways movement exposes the generals
Side to move: r
Pieces: e0 rG, e5 rS, e9 bG
Proposals: e5-f5, e5-e6
Answer: The sideways move is illegal;the forward move keeps a blocker.
Explanation: e5–f5 removes the last e-file blocker.e5–e6 retains a soldier between the two generals.
FEN: 4k4/9/9/9/4P4/9/9/9/9/4K4 w - - 0 1