Include Game: Synchronous Chess

[donkirkby]

Try out Synchronous Chess and Simultaneous Chess to see if either one is playable.

• Try Synchronous. It sounds more promising, with an intermediate phase between synchronous moves where players can exchange blows on the pieces that just moved. There's also a discussion of the history and some rules questions.
• Try Simultaneous, although it doesn't seem like a big enough change. White starts with "initiative". Player without initiative loses a turn when moves conflict, but takes initiative.
• Look for more simultaneous movement variants in D.B. Pritchard's Encyclopedia of Chess Variants.
• Choose one to include, or neither.
• Add to rules.
• Add example and diagram.