The tendency
Cancer players keep most of their pieces on or near their own end of the board. They can be daring or careless, but they are not pushy. When they do attack, they often fail to protect the piece they are attacking with, and will repeat that same mistake after losing it.
They are sensitive to ridicule, and their moods carry straight into the game. If they are losing they may try to distract you into finishing quickly.
The Cancer chess life
Cancer players generally start around age twenty and stop around thirty eight. They prefer fast games, average about one game a week, and excel in the middle game. They can be strong when they concentrate, but overconfidence and greed lead them into traps.
Pieces Cancer favors and fears
They favor queens and rooks, and fear an opponent queen and bishop. On promotion they may not ask for a queen at all, requesting a rook, knight, or bishop instead.
How to play against a Cancer
Criticism disrupts them, which is the whole vulnerability in one sentence. Set traps and let their greed walk into them, and watch for the unprotected attacking piece, which comes back more than once.