The Retrograde Analysis Corner
Dynamo Chess is a fairy variant of chess where there are
no ordinary captures. Instead the men have the ability to pull
or push (possibly outside the board) other men.
A dynamo move by a line piece (Q, R, or B) consists of pushing or
pulling another man (of either color) observed by the line piece along
the line; the line piece itself may remain stationary or it may move
along the line in the same direction as the other man.
A dynamo move by a leaper (K, N, or P) observing another man (of either
color) consists of the leaper remaining stationary or moving to the
other man's square and pushing the man one step away in the same direction,
or it consists of the leaper moving in the opposite direction and pulling
the other man to the leaper's old square.
A dynamo move can affect at most one other man. Men disappear from
the board by moving off it themselves, or by being pushed off it, or
by being pulled off it by a line piece that also disappears.
Check means threatening to make the opponent king
disappear by pushing or pulling.
The moving man and the affected other man (if any) must respect other
men standing around, just like in ordinary chess: you cannot jump over
another man, nor may two men occupy the same square.
15+16. Shortest proof game in
2.5 moves (Dynamo chess)
Here is the proof game, exhibiting many weird Dynamo moves:
The wPd2 made a roundtrip.
Another pedagogical example is
Problemkiste No. 3718
Many thanks to Henrik Juel <hj(at)serv3.imm.dtu.dk> for spelling
these rules out. Let us know if some questions are left pending.