This Timmy used to be a good friend of mine until a few years back. He was an okay guy and then 'it' happened. He usually won heavily, owing to the new Marine codex, but I could still hold my own. I never questioned his lists back then (though looking back I should have) and relied upon mutual trust. Then one day 'it' happened. I won a game and my Guard royally thrashed his Marines. Nothing much happened initially, though I noticed that on the next game we played he seemed to have more stuff. I resumed losing. His armies seemed to get tougher and tougher and he didnt seem to like playing anyone else......
The first real hint came with the inclusion of his new homebrewed "chapter Master" (in reality a discount Primarch with stupidly good rules and stats) named Makutor Nagga.
Makutor was a powerful character and in the space of four turns had wiped most of my army out.... Then the second 'it' happened. My Company Commander, on one wound and unlikely to survive managed to kill this Juggernaut in single combat. The game was a draw.
From there the escalation in Timmy-ness largely halted for a while until...

Enter the tanks
Up until this point my Guard had had no tanks, barring two Chimeras and a single scratch built Thunderer, but noting the current turn of things I acquired a single Exterminator. This single tank shocked my Timmy with its resiliency, but apart from that failed to do much more and as he had more tanks and anti tank units he was able to safely ignore it. What he couldnt ignore came later. In an agreed game with an AI Horus and guard unit in the middle of the table I turned up with two Battle tanks and a proxied Executioner. Although he won these tanks where a shock. In the next game the Battle tanks, now joined by a second Exterminator, began to decimate his army.
It was around this time that the first major whining began. Up until now there had only been one or two grumbles about the orders (in particular FRFSRF), but now the complaints about 'OP' Leman Russ could be heard ever so often.

Timmy counters
It was soon after this that Timmy called for a new game idea he had developed. Simply put the game would take place in an underground city but "the corridors and streets are too narrow for tanks and only transports and walkers can be used". Like the trusting fool I was I agreed. It was a massacre as my army was wiped by Charadon units including that commander in terminator armour. Denied the firepower needed the Guard caved.
Naturally Timmy was very happy with his victory.
Life continued and the games against Timmy varied, but he continued to win and I continued to be ignorant to the notion of cheating. Timmy was happy with his "superior tactics" which kept bringing him victory (with the occasional grumbling about OP Guard units) until

The great tank whine
I made a mistake. I dared to start using Guard tanks as my primary source of firepower and Timmy did not like it. Timmy's tactics largely consisted of running most of his army across the board as fast as possible whilst his devestators provided supporting fire. up until I got tanks this had been an okay tactic as my Infantry could not put out enough firepower to stop his Marines, but with the two Battle Tanks, the two Exterminators and the Thunderer I could now put out a serious amount of hurt and when I added an Eradicator to this list all bets where off. I had dared to got too far and needed reigning in.
Timmy started up a bitter rant of complaints over a PM. He told me that i no uncertain terms IG tanks where over powered and that I needed to stop relying on them because I was breaking the game (please note, this was in 6/7th) and ruining it. We talked and (after a thread on Dakka - see above link) I managed to get him to see reason. Or so I thought.

Timmy, the cheating, or the Primarch Vulkan
Timmy called for another game at 1.5K with no Super Heavies (I was the only one with a Super Heavy at that point and I rarely used it) and I thought "why not? He has seen reason after all". Boy was I wrong. An after battle analysis showed that he had brought over 2.5K's worth of stuff (thank you Dakka for that bit) as well as a Primarch.
Unfortunately I won the game, largely owing to Timmy's lack of a tactical mindset. Timmy was furious about this, though when confronted about his cheating fell oddly silent.

Timmy and the cavern
Timmy had started building a 30K army by this point but was still largely a 40K player. Now, after his resounding defeat, and a couple of other close games, he decided he wanted another 'underground city fight', but this one would be a "fun and fluffy'" game, and we could each have a free walker unit. Timmy turned up with Charadons with an Ironclad unit and assault terminators, and a lot of Charadons allied with Konrad Curze and a large number of 'counts as' nightlords.
needless to say the battle was not.

The end of the Chaos
Timmy had a small Chaos army and, with the new Cities of Death WD rules felt like bringing them back for a game (he hadnt used them in a looooooonnnnnnnggggggg time). Once again a 2K game and I agreed too it. After all, it sounded fun.... Timmy wanted to play the Sewers mission (each player has three counters and places them pre-game. You can infiltrate units through them) I brought my Shadowsword just because it was getting dusty and Timmy turned up with [fanfare] a Demon Primarch.
Needless to say it should have been a tough fight but it wasnt, primarily owning to Timmy's tactics. Once again he chose to bumrush most of his units and only bothering to infiltrate 20 cultists and 5 Thousand Sons, all of whom ate a Volcano Cannon.
Timmy promptly packed up and went home to launch a massive tirade online, mainly focussed around how ‘OP’ Guard orders are, and that Shadowswords are cheating units . Shortly afterwards he sold his Chaos for ‘reasons’.

Grey Knights
Around this time, Timmy faced another friend of mine who plays GK. Whilst details are unclear Timmy came away furious and refused to play GK again unless they lost their psychic powers, calling them "cheese" and "OP".

The Viking Pirate
Fast forwarding a little (I am rusty here) life continued as normal. However another friend of mine (the Viking Pirate - an all round awesome guy) decided to play Timmy. This friend has Space Wolves and decimated Timmy in what was a one sided massacre. Timmy complained bitterly about Bloodclaws and how Marine Scouts shouldnt be veteran....
Timmy also faced Orks shortly afterwards IIRC and had a tough fight.

The cheese party - Invisible Vindicators and sneaky Librarians
This is more of a general review on Timmy's tactics around this time. Timmy now had a set number of favoured builds that he liked to run. Invariably he would have his favoured 'Guard Smasher' combo consisting of three Vindicators and a five man Libby conclave. The Vindicators would be in a squadron and the Librarians would cast Invisibility (they always got Invisiblity - more on that later) on them whilst advancing behind the Vindicators. The invisible Vindicators would form up in a solid block and hide the Librarians whilst being largely immune to return fire themselves.
Timmy also liked close combat. These dedicated units usually consisted of Lightning Claw Terminators with by that Charadons Captain/Chaptermaster. To get them in safely every sergeant had a Teleport Homer, although sometimes they where deployed in a Landraider. Needless to say, stopping them was tough.
Primarchs. Timmy loved them. And still does. The usually advance with another big unit or are put in the Landraider. As before, Timmy like assault and will endeavour to get there.
10th Company Task Force. Not really too bad on its own, but when combined with everything else it became the iceing on the cake.
Assassins. Timmy loves these and uses them a lot. His two favoured are the Vindicaire and the close combat choppy murder one.
Wub-wub disco party. AKA ALL DA LASORS. Triple Las preds with the Landraider Terminus Ultra make Timmy feel good, especially when pesky Guard tanks are being tough.
Extra points. Ultimately this was Timmy's fall back. He would cheat and not bother to bring a force list, relying upon me trusting him. Looking back he did this a lot.
Bumrush. Ultimately all of Timmy's tactics come down to this. He just launches everything (baring a few dedicated fire support units) across the board and hopes to hit home. At a fair points value this is easy to counter but when he cheats, well....

Boarding the ships
This one is my fault. I made the mistake of mentioning boarding actions to Timmy a year back and we tried one game. After losing all three of his objectives (he had to stop me blowing up three objectives to win) he decided that they were silly games and we moved on, until that is he asked for one again. Silly me, I should have realised. He had noticed that I couldn’t infiltrate my Stormies any more and so couldn’t kill the objectives fast, and coupled with his new toys it soon turned into a slaughterfest.
Suddenly boarding missions where okay again.

Typhon joys
Not a big one here. The Timmy wanted a now LoW game, well to be specific he said no Shadowsword variants. I was understanding enough to agree. Big mistake and the Timmy was giggling as he set up.
It turned out that he had procured a Typhon (bank of mum) and was using it. Two turns. Two.

The Cheatening – Timmy gets desperate/confident
Another ‘underground City, not tanks’ match although this is to be the last. Timmy had a hard time persuading me, but as I was in a good mood I did eventually cave in. Agreeing to 2K Timmy made the critical mistake of showing me his army a few days before we played. I knew he was cheating at once for the simple reason that he had more Infantry than I did, despite his cheapest naked basic Infantry unit costing more than my most expensive tooled up unit (he was using 30K), and one of his walkers costing more than mine.
After a bit of calculation I brought roughly the equivalent and the game ended in a very close draw, although his wining the deployment role off and infiltrating most of his army meant I had a rough time.
The “superior tactics” attitude was back
There was a brief interlude after this period where he played against the Ork player and then we had a Deathwatch campaign (mini wargaming [yes, he also failed to do well there, losing half his team to a bumrush to the objective after declaring he was turning rebel]). After facing the Ork players 30K Alpha Legion (a very nasty army) we then had a three way between my Guard, the Ork players Orks and his World Eaters (I think they were anyway) in which he lost most of his force he really started to complain.
Long story short, My Guard and thus me by default, are utter cowards and he was fed up of me sitting back and using my long ranged firepower. Apparently the guard should advance across the table to take objectives and it was my fault that I lost games because I built bad lists and refused to push recklessly.

The 30K era, or a legion shattered
For this period Timmy played two other Marine/30K players. Each time he was beaten heavily, with one game against Imperial Fists resulting in him being tabled by turn three. Against the Viking Pirate’s Death guard (mainly the contents of the macragge set) he lost heavily, the first time having his Artillery outflanked by Veterans and the second time being delayed by DS units which prevented him from holding the objective.
It was also around this time that the Viking Pirate noted to me that the Timmy seemed to take out his frustration at losing on players who had weaker armies than his, frequently bringing the cheesiest possible lists for these. Of course he would usually win and thus would feel better in himself.
Operation Salt, the start of the fall
Shortly after the Viking Pirate flattened Timmy for a second time Timmy sent a request for a game, his outrage at having lost badly to someone with less than half his obvious. To quote

Are mission is hammer and anvil deployment and auto night fighting oh an NO CHEESEY LISTS and TANK SPAM

when I asked when I tank spammed (a little confused as I have 6 tanks) he said

Err all the fething time

This was followed by a long rant about Shadowswords and which one is for which book (apparently the GW one can only be used with the GW Apocalypse book, even though it cannot be legally built from it) Eventually things where resolved (he apologised for acting in such a way).
So, Operation Salt begins. Operation Salt (my name for it) was intended to crush him. By this point I was beyond mercy, having had him going on about how I would have to advance and not hang back. He also boasted about how his army would be far too powerful for me to counter.
I should probably note here that the Viking Pirate warned me about how badly he had crushed the Timmy, and to prepare for a bad one.
I had intended to teach him a lesson, basing my army around a Macro Cannon with a Veteran Section to garrison and another to take the Bunker, an inquisitor for Servo Skulls, etc. All the objective taking was to come from deep striking Stormy units and a Termy unit with a Libby. The battle was a farce, right from the start something felt off about his force, although I put it down to suspicion.
Well, after a humiliating defeat I returned home to stew. Something had been off and it turned out that he had over 2660 in a 2K game. Needless to say I was furious, and luckily the Viking Pirate volunteered to confront him, whereupon the Timmy claimed it had been a 2.5K game.
This was compounded by Timmy whining about the Macro Cannon (despite it doing little after nuking his Landraider Terminus Ultra)

Operation Whine, the last battle
I should have left it there, this was already over. But I was still furious about my humiliation and I would have my vengeance. Taking a gamble that the Viking Pirates suspicion was enough to stop him from cheating I agreed to a 3K game. I also had one more piece of data to my advantage – he had Perturabo and he had built the Tormentor and was eager to use it.
I built my army based around two CAD’s with the Macro Cannon, each CAD having a LOW, one a Baneblade borrowed from the Viking Pirate and the other being my own Stormsword. With an allied Armoured Company I had 11 tanks plus two super heavies, enough to do real tank spam.
The battle was pretty tough, for him. I pushed up and took the centre early on and proceeded to dominate the board. Timmy lost 21 to 11, and even worse lost Perturabo and The Tormentor as well.

The result was immediate, The next day a tirade was waiting for me online. Timmy was furious about his humiliating defeat. He accused me of cheating by bringing a tank that wasn’t my own and for using more than 25% of my points of Lords of War, claiming that the rules in the 30K book applied to 40K as well. He also called Macro cannons overpowered.
This went on for a day and then he finally made his last rant, refusing to believe that he could be wrong or his precious marines could lose. He lost and badly and had an utter paddy.
Timmy then attempted to remake contact. Thus far I have done nothing more than politely reply.