First, I apologise for asking a question that's not strictly in the right Q&A format; I'm hoping there are quality answers anyway.
Are there any puzzle or solitaire games based on chess? By this I mean
- Does not require more than one intelligent player (e.g. if there is a second player, their moves can be mechanical or based on simple rules)
- Based on the rules of chess (or chess variants such as xiangqi): either using real chess pieces, the rules of capture, or maybe even novelty pieces
For example, the 8 queens puzzle might qualify, although in my opinion it's not very fun to play as a game. There's also a toy called "Solitaire Chess" based on a 4x4 board and the objective is to only use capturing moves until only one piece is left, just like solitaire. Are there any more like this?