This is a Blob Chess tournament. Blob Chess is a chess variant that can be played on a Standard chess engine. You just need to follow two move restrictions:
Restriction #1 (R#1) – You can move a piece only if it is adjacent (horizontally, vertically, or
diagonally) to another one of YOUR pieces before you move it.
Restriction #2 (R#2) – The piece you move must land on a square that is adjacent (horizontally,
vertically, or diagonally) to another one of YOUR pieces.
Before you sign up, check out the Blob Chess topic in the Mini-tournament forum. And you can also check out this documentation:
http://home.windstream.net/windhams/Games/ChessAndGo/Blob%20Chess2.pdfGood luck!