32 ( +1 | -1 ) yupI have one. I played it with Knightmare chess cards with a few friends of mine. It turned out to be a several-hour-long brain melter, and strategy was becoming more social with alliances and advice and such.
It's interesting and worth at least a couple tries, like most chess variations are.
37 ( +1 | -1 ) Actually, Quadrachess (or at least the game I am familiar with) is a 2 to 4 player game. There is a special board. Its a standard chessboard plus an additional half chessboard on all four sides of the board. Each army occupies one of these wings. There are several variations that can be played. The game is produced by The California Game Company in San Jose, CA.
24 ( +1 | -1 ) ...Yeah, I looked up the board just to be certain that I was talking about the same thing, and it is. It has those extra rows on each side just like you described. Perhaps "variation" was just a wrong word choice...
107 ( +1 | -1 ) Apparently there are rule variations. It looks like QuadraChess is just a brand name for 4 way chess. I've played against a 4 way chess java program that 'sucked' big time. I won easily. Despite this experience, I can see how it might be an OK game. It would be much more social.
As far I can see, it is not quite an addition half board added to each side. It is just 3 additional rows per side, not 4. The board looks sort of like a cross. And you now have 64 center squares; that's OK because your opponent is Not across from you. Play is very different. Your team mate is across from you. You alternate turns with your opponents seated adjacent to you on either side. You do get weird dynamics; but the change is easy to cope with.
The main advantage is that it is a social game. You and your team mate have to coordinate. In a real game, I'm not sure how this is done. You don't want to let the other team know your plan. Yet, maybe lack of coordination between you and your team mate is part of the game.
170 ( +1 | -1 ) While looking through the Internet, I found one variation that does not allow communication between partners. In fact, communication about the game concerning specific moves or strategy is penalized by a loss of turn.
I've seen different rules for what happens to the pieces when an opponent is checkmated. One version calls for the pieces to be removed from the board, while another calls for the pieces to remain. When they remain, the pieces are completely inactive. Even the King can move through what was formerly an attacked square. A King can even move directly next to an inactive King. If you move your King next to your former teammates inactive King, then the game is a draw. If the pieces remain, then the checkmate can legally be relieved by either a team mate or opponent. When this happens, the pieces become active again and the player who was out of the game is now back in.
At least one version (perhaps all of them) states that there is no promotion of the pawn when reaching the back rank. The pawn goes forward; when it reaches the other side of the board, it then reverses direction and even attacks backward. Also, pawns leap over teammate pawns. The only way to promote a pawn is for the pawn to reach one of your opponent's back rank. This can only be done through a series of captures. Pawns that are going backwards must be specially marked. The En Passant rule still applies when there is a double pawn move, but the capture is now done at right angles because you cannot capture your own teammates pieces.