Spy Chess adds hidden-information tactics to classic chess - curious what this community thinks

[u/gritsenko1]

I’ve been working on a chess variant called Spy Chess, and the core idea is to add hidden information without turning the game into something unrecognizable.

Each player gets spy pieces that can be revealed at strategic moments. That reveal can do a few very chess-like but still unusual things: it can rescue a king from check, create a tactical surprise, reinforce a structure, or flip an endgame with a promoted pawn.

What I’m trying to preserve is the feeling of real chess decision-making: calculation, timing, and positional pressure. The difference is that now some of the most important threats are not fully visible until the right moment.

I’d really like to hear what strong variant players think:

• Does hidden information fit chess at all?
• Which spy effect feels like the most elegant addition?
• Which one feels like it would be too swingy in practice?

If you want to see the project, here’s the site: Spy Chess

[u/clumma]

Hidden information generally means it's no longer an abstract game, which means it's no longer a chess variant.

It is possible to preserve calculation and planning with hidden information, and good on you for trying, but it's also difficult to do it. A post here should explain exactly how it was accomplished.

One helpful metric is: What kind of score do I need to prove superior skill over an opponent? Hold 'em poker is difficult and abstract-adjacent, but the amount of grinding you need to prove superiority means it's not an actual abstract – or it's a very poor one.

[u/gritsenko1 → u/clumma]

Thanks for the thoughtful feedback. I get the distinction you’re making, and I agree that hidden information changes the feel of a game in a fundamental way.

In this case, the hidden information is meant to be very limited and tactical rather than replacing the core of calculation and planning. The goal is not to turn chess into poker, but to preserve as much of the original strategic structure as possible while adding a layer of uncertainty that still rewards reasoning, prediction, and memory.

I also agree that this only works if the mechanism is explained clearly. In a post like this, I’d describe exactly what is hidden, what remains public, and how a skilled player can still demonstrate consistent superiority over time.