DEADMATCH TIPS Avoid Getting Sandwiched
Sandwiching is when there is at least one person on both sides of you firing at you at the same time. This means you're going to be taking twice as much damage as you would one on one and you're probably going to die quickly. If they aren't targeting you, the crossfire will more than likely kill you anyway. To avoid this, stay away from the middle of long walkways and common areas that are bound to have people coming form multiple entrances.
Sandwich Other People Whenever Possible
If you see two people fighting, try getting on the outside and let the bullets fly. If you're lucky, sometimes you can get three or more in a single area and shoot them in a line. Not only will this royally piss them off, but also it's going to land you a lot of quick, low risk kills. Don't feel bad; they'd do it to you if they had the chance.
Wasting Ammo Will Get You Killed
Ever run out of ammo and wondered, "Wtf do I do now?" There are pickups that you can get to increase your ammunition, but the odds are strong that running out of ammo is going to seriously reduce your capability to kill people and will more than likely get you killed since you can't really defend yourself. If the enemy isn?t in your crosshair, lay off the trigger until they're back in it. It?s hard to do sometimes, but it's best to keep it in mind.
Keep Moving
4/5 Dentists Running in a straight line means you're an easy target. Rolling, dashing, and jumping will make you a much more difficult target. If you have an accurate ranged weapon, rolling away from your target would be the best option. If you have inaccurate mid-range damage, rolling to your target would be the better option.
Utilize Obstacles
If someone is focusing on you, use obstacles to waste his ammo and strike back. If two people are attacking you, use the map to only let one see you at a time.
Follow Your Target
If someone is following the previous two tips, don't let them lose you. Switching targets once you've caused damage to someone means you just handed someone else a free kill. This also means you now have a stronger target to deal with.
Read Your Opponents
An enemy running away means a weak enemy. Usually, if you see someone trying to distance themselves into a defensive position, you'll want to follow them and pull the ol' trigger.
Grenades are Your Friends
A properly placed grenade in a group of unaware brawlers means loads of kills for you. Likewise, avoid finding yourself in an unaware group that gets grenaded.
Sword Fighting
Generally in a deathmatch, if you pull out your sword, someone will be carrying their gun, and that guy is going to drop you with all quickness. If you find yourself in a situation where you can get the person one on one and are pretty decent with the sword, that might be the time to bust it out and do some chopping. Right-clicking will knock down your enemy, leaving him vunerable to attack from your ranged weapons. Holding down the sword attack button will charge your weapon with a stun attack. Releasing the attack will cause stun damage over an area of effect. Note: blocking and quick movements are going to be necessary even if they also pull out a sword.
Counters to Sword Fighting
Blocking is only effective against shots to the face and chest. If someone is blocking with a sword, shoot them in the legs or toss a grenade. If those two aren't options for you, going sword vs. sword might be a good idea if you know what you're doing. Blocking will be key, as a successful block will instantly charge up your sword and deliver a decent amount of damage in a large area of effect. If someone tries to use a sword knockdown on you, hit your jump button to quickly reverse the effects before you hit the ground.
Weapon Combinations
Some maps are more favourable to certain weapon types. For large open maps or maps with long hallways, using accurate ranged attacks like rifles and pistols will give you an advantage. For smaller areas taht have lots of corners, shotguns or SMG's might be preferable. In either case, having a diverse array of weapons will usually play out in your favour. When your enviroment makes it appropriate to use a sword, one good tactic is to charge your sword, deliver the charged attack which will stun your enemy leaving him defenseless, and follow the stun attack with a ranged attack.
Utilize the Map's Health and Armor Kits
If you're low on health and are somewhere close to a health or armor kit, take the time to get it. They're worth it. If you don?t know what they are, they're the glowy items you can get that instantly raise your health or armor when your character runs by them. If you don't know where they are on the maps, find out. Making sure that your enemies don't get to them when they need it can mean the difference between you or them dying. usually, the hardest health kit to get is the most rewarding.
Reloading
Reload at every safe moment possible, even if you have some ammo in your clip. This will reduce the amount of reloading in firefights and it will maximize efficiency from ammo pickups.
Killing Laggers
Often times, you may fire off target only to strike the fatal blow. What?! It looks like it went strait through air. But no! It nailed him. The key to the game, while using semi-automatic weapons, is to predict your enemy's movements and shoot a step or two of where he currently is. Your hit indicator will not beep when you do this, but if you develop your skills, you will notice considerably faster skills.
Contributers: Special thanks to Recursive for the "Reloading" tips and to WeezerBlue for the "Killing Laggers" tips.
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Deadmatch Tip 
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