There used to be a game online (that was popular in my childhood) called Kung Fu Chess[0] -
This removed the "Turn Based" application of Chess and instead made it real-time online - with only a period of 1-5 seconds of waiting to be able to move a piece again, depending on your settings.
The other "novel" feature was the introduction of a 4 player chessboard - it added to the strategy having three other opponents all looking to get the jump on you.
The game unfortunately shut down in 2008 - not sure where it ended up.
This removed the "Turn Based" application of Chess and instead made it real-time online - with only a period of 1-5 seconds of waiting to be able to move a piece again, depending on your settings.
The other "novel" feature was the introduction of a 4 player chessboard - it added to the strategy having three other opponents all looking to get the jump on you.
The game unfortunately shut down in 2008 - not sure where it ended up.
[0] https://en.wikipedia.org/wiki/Kung-Fu_Chess