How to fight in San Andreas for iPhone?

How do you block and what not?

Fighting in San Andreas is not like the other melee games.
There's NO Blocking. You only shoot, stab, slash, stomp, kick, or punch.
Learn melee maneuvers in the three Gyms (one in each big city).

The one learned in a mission (but usable a anytime) is to crouch with the knife armed, sneak up behind the target, 'aim' and when CJ raises his knife hand, 'fire'. CJ will slash the throat of the target (with appropriate noise).