Close combat ends when either only one unit is left standing or one flees.
The attack stat indicates the base amount of attacks in close combat.
Most tyranid units seem to do good in close combat as long as they don't get shot to death, which they usually do. Grey knights and Daemons do pretty well in close combat as well.
Anything that is close combat oriented & can move up the table quickly.
I in Warhammer stands for Initiative which in close combat defines who hits first. It also defines how much you must roll to steal Initiative from the person who deployed first.
A power claw will double the strength of the model using it but means they will always attack last in close combat.
No, the "Attacks" attribute only indicates the base number of attacks in close combat.
Presuming that by 'A' you arereferringto the model characteristics/attributes. 'A' is the number of attacks that the model may make in close combat during the respective phase.
Adds +1 to combat resolution
In Warhammer 40k, the concussive rule affects units that are hit by concussive weapons. When a unit is hit by a concussive weapon, it reduces their Initiative stat by 1 until the end of the turn. This can impact gameplay by making affected units less effective in close combat situations, as they may strike later in the fight sequence.
In the 7th edition of Warhammer 40k, the specific changes to the fleet rule include allowing units with the fleet special rule to re-roll their charge distance, making them more effective in close combat situations.
Gromril Armour grants them a 4+ armour save. Then there's the shield for a 3+, and when hit from the front in close combat they get another +1 to their amour save from the handweapon/shield combo, thereby granting them a total of 2+ (in close combat, when hit from the front).
There is no best and/or worst army in Warhammer 40k. The points system is mostly fair and reflects how these armies should be played. Tau are good at shooting but not so much at close combat, same with Orks and Tyranids, they're not the best at shooting but can eat you up at close combat (most Orks have a BS of 2 I think)