Mistakes Were Made
Introduction
Game 1: Artosis Paladin vs Trump Druid
Game 2: Artosis Paladin vs Trump Mage
Game 3: Artosis Paladin vs Trump Priest
Game 4: Artosis Warrior vs Trump Priest
Conclusions
by curi
I watched Blizzcon live online, constantly discussing it in chat with my friends at Teamliquid.net. Our impression was that the players made some big mistakes, such as Reckful missing lethal damage and Kripparrian losing the deciding game in the grand finals by holding on to Acidic Swamp Ooze. But that was in the heat of the moment. Was our impression still correct now that we have some time to reflect upon them? Did we misjudge their moves when looking at things in real time? I wanted to go back through the VODs and look over the games more carefully. The goal here is to analyze the interesting plays and check out how often the semifinalists made suboptimal decisions.
I'm going to analyze the Blizzcon games by looking at the most important turns, especially ones where someone made a mistake. This article covers Trump vs. Artosis in the semifinals. Turns in red will feature a mistake by one of the players. Turns in black are not necessarily mistakes, but interesting turns I want to comment on. Each mistake is rated from 1 to 10, with 10 being the most severe and game deciding. In the middle, monk and StrifeCro will be adding their additional thoughts and points of view. Please feel free to follow along with us with the VODs.
I watched Blizzcon live online, constantly discussing it in chat with my friends at Teamliquid.net. Our impression was that the players made some big mistakes, such as Reckful missing lethal damage and Kripparrian losing the deciding game in the grand finals by holding on to Acidic Swamp Ooze. But that was in the heat of the moment. Was our impression still correct now that we have some time to reflect upon them? Did we misjudge their moves when looking at things in real time? I wanted to go back through the VODs and look over the games more carefully. The goal here is to analyze the interesting plays and check out how often the semifinalists made suboptimal decisions.
I'm going to analyze the Blizzcon games by looking at the most important turns, especially ones where someone made a mistake. This article covers Trump vs. Artosis in the semifinals. Turns in red will feature a mistake by one of the players. Turns in black are not necessarily mistakes, but interesting turns I want to comment on. Each mistake is rated from 1 to 10, with 10 being the most severe and game deciding. In the middle, monk and StrifeCro will be adding their additional thoughts and points of view. Please feel free to follow along with us with the VODs.
Game 1: Artosis Paladin vs Trump Druid
Trump begins the game with a terrible high-mana-cost hand. Conversely, Artosis gets a lucky double Knife Juggler opener and takes an early lead. Trump is already down to 19 life after his fourth turn and then he is hit for 5 more by an Imp buffed by Blessing of Kings because he couldn't clear every creature off the board.

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The Azure Drake play struggles against more counters than just Truesilver Champion. Given Trump's hand, he has no answer for Shattered Sun Cleric buffing the Imp to 6/6 for Artosis and reducing Trump to 8 life. Trump would have 5 attack worth of creatures on the board and using Shapeshift to finish off the 6/6 would be suicidal. Another card that would counter Trump’s turn 5 Azure Drake is Argent Protector. None of these counters, however, would cause as much trouble for Sylvanas.
Cards in your hand only provide value if you can find the mana to cast them. When the total mana cost of your hand is higher than the amount of mana you will have available on the next few turns, you probably have enough cards for now. It's important to have enough cards to spend all your mana and any more than that only provides more choices for when to play each card. Because the early game went poorly for him, Trump is at risk of the game ending with a bunch of cards still in his hand that never got to have any effect. What he should be focusing on now is playing his most powerful cards first to try to live long enough to play everything.
Mistake Rating: 9 Trump's health is already at risk on turn 5 due to Artosis drawing better early cards. This is realistically his last chance to stabilize the game. It’s important to play the card with the best chance to take control of the game so Trump could regain the tempo advantage. After playing Azure Drake, Trump remains on the defensive for the rest of the game and actually died without ever getting to use Sylvanas.
monk says:The bigger overarching concept here is choosing between tempo/board control and card advantage. In this scenario, Sylvanas represents board control and Azure Drake represents card advantage. At this point, Trump is struggling in board control, but doing extremely well with card advantage, especially since he's holding so many quality cards at the moment. Instead of trying to shore up his weaknesses and contesting for board control, Trump essentially decided to extend his card advantage lead, an extremely poor decision.

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Mistake Rating: 8 I understand the temptation to heal when at 6 hp, but Trump is behind already and it's time to take a risk. His play makes reasonable sense and probably didn't cost him the game, but it didn't give him the best odds of winning. It can feel safer to heal up, but actually it's usually better odds to try and control the board first and heal up later (if you're still alive).
StrifeCro says:Cleric is a better choice than Harvest Golem because its a more bold move; Cleric develops 8 immediate power(attack + health) on the board here whereas Golem develops 5. With turns winding down to the finish line, the deathrattle on harvest golem is too slow. It is likely Trump will need the raw strength of his minions earlier than a deathrattle effect would give. Harvest Golem's normal strength is that it stickes to the field better but Trump is not worried about his creatures dying with his HP so low. Any spells or attacks that are going to kill a creature will likely be going to his face. In addition, it's very likely that he will have to Ancient of Lore next turn, so the Cleric probably won't be able to be used in the next turn if Trump had gone for the Golem option. That being said, Golem + Keeper still would have been a better move than Trump's decision to Ancient of Lore

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An alternative play for Trump, which is important to consider, is to kill all of Artosis' creatures. In general, it's usually the right play when you can kill everything. To do this, Trump would have to Shapeshift, attack the Argent Commander, and kill it with his Ancient of Lore followed by playing Ooze and Keeper of the Grove to kill the Argent Protector. This leaves Trump at 2 life, which is more dangerous than 3 or 4 because it leaves him vulnerable to Consecration. However I think it's still a pretty good risk to take in this desperate situation. Trump's best chance for a win may be to go all out and kill every creature Artosis plays for the next few turns while gaining HP with Shapeshift and hoping Artosis doesn't draw any immediate damage.
Mistake Rating: 4 Trump's choice of Ooze is normal and OK, but it's time to take some risks when normal play leaves only a slim chance of victory. I believe by taking a risk here, Trump could have slightly increased his chance of winning, albeit still quite low.

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With Trump at 2 life, Artosis should be pressuring for the immediate kill. The game is almost over so there isn't much to save for the future. Additionally, it looks like Artosis will be playing Lay on Hands next turn so he won't have the mana to play Spellbreaker then. He needs to play it now. If Trump has no answer, Artosis wins. If Trump does have an answer, Artosis can play Lay on Hands and try to find new ways to win.
Artosis may have been trying to get the most value he could from each of his cards. Spellbreaker has a battlecry that he didn't want to waste, but mana cost should be taken into consideration as well. Since the mana would otherwise be wasted, he's essentially looking at a 4/3 for zero mana, which is a good deal even with no battlecry. Killing Trump is also time sensitive and mana is going to be tight on future turns. Pressuring for a potential kill, and being mana efficient, are other types of value, even if they "waste" a battlecry.
Mistake Rating: 7 Artosis leaves 5 mana unused and chooses not to pressure for a potential kill. Saving silence plans ahead for the future in a non-specific way but he should have planned ahead for specific possibilities over the next couple turns. In the grand scheme of things, this mistake doesn't change the outcome of the game because of Artosis’ advantageous position, but it is still a poor choice.

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Bonus Tip!
See those two Lay on Hands in Artosis' hand at the end? That's why I wouldn't recommend using two copies of that card in one deck. It's a card that you would very rarely want to cast twice in one game. It takes a lot of mana and can be hard to cast even once. After you do cast it, now you have 3 more cards, plus the card you draw every turn, so it's going to take a ton of mana to use all that up. For that to work well, you'll want some lower mana cards you can actually cast, not a second Lay on Hands. Lay on Hands can be thought of as something like a 17 mana card: 8 mana to cast it, plus another 3 per card drawn. (The exact number depends on the average mana cost of your deck.) Two 17 mana cards in your hand is just terrible, so don't construct a deck with two copies and risk that situation. Furthermore, healing is a situational ability. Healing is good if you're low on life but have board control. However, many times you're low on life you don't have board control, so you have to try to get board control and save the healing for later. Lay on Hands does not get you board control this turn so in a tense, close game it can be too slow. In general, most situational cards shouldn't get two copies in your deck because of the risk of having two cards in your hand that aren't currently useful, and that could cost you the game.
See those two Lay on Hands in Artosis' hand at the end? That's why I wouldn't recommend using two copies of that card in one deck. It's a card that you would very rarely want to cast twice in one game. It takes a lot of mana and can be hard to cast even once. After you do cast it, now you have 3 more cards, plus the card you draw every turn, so it's going to take a ton of mana to use all that up. For that to work well, you'll want some lower mana cards you can actually cast, not a second Lay on Hands. Lay on Hands can be thought of as something like a 17 mana card: 8 mana to cast it, plus another 3 per card drawn. (The exact number depends on the average mana cost of your deck.) Two 17 mana cards in your hand is just terrible, so don't construct a deck with two copies and risk that situation. Furthermore, healing is a situational ability. Healing is good if you're low on life but have board control. However, many times you're low on life you don't have board control, so you have to try to get board control and save the healing for later. Lay on Hands does not get you board control this turn so in a tense, close game it can be too slow. In general, most situational cards shouldn't get two copies in your deck because of the risk of having two cards in your hand that aren't currently useful, and that could cost you the game.
Game 2: Artosis Paladin vs Trump Mage
Artosis chooses to replace all his cards, including Truesilver Champion. I thought maybe he should keep Truesilver, but it depends on how his deck plays and I'm not certain what's best for him against a Mage.

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Another reason to go with Yeti is it gets more mana out of your hand. You are left with 2 mana creature in your hand instead of a 4 mana creature. I think Trump may have done it the other way for this reason – he wants to use up the weaker card (Faerie) and keep the more powerful card. There's some logic to that. Why trade Yeti for your opponent's stuff when a mere Faerie can accomplish the same thing? The reason is mana. In the prior game, Trump died with a bunch of high mana cost cards in his hand. He's playing a similar deck as before against the same deck Artosis used in game 1. He has a big hand that will take quite a while to use up. It would be wise to put more mana towards playing cards from his hand while he has the chance. On a later turn, maybe he can play the Faerie Dragon along with a larger creature for board presence.
Mistake Rating: 5 Trump is being too greedy. It's usually important to prioritize getting the best situation you can now rather than saving up for the potential fireworks that comes later. But in the long run, this decision probably isn't a game changer.

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Mistake Rating: 7 I can see why Trump did it. He doesn't want to lose Yeti for a Truesilver durability and a 1/1. But this is greedy and it isn't a risk he had to take to win the game. Acolyte is risky against any of the common buff creatures, which all allow it to be killed at the cost of a Divine Shield. If that happens, Trump's board position would be in jeopardy and this play could cost him the game. Trump is too focused on getting big value from each card rather than value from each mana, which is a mistake we've seen Artosis make.
monk says:A recurring theme in Trump's losses is that he often ends up dying with a full hand while his opponent kills him with very few remaining cards in his hand. I believe this turn showcases very well why this keeps happening. Trump keeps making the mistake of prioritizing getting the most out of his cards rather than pressuring his opponent or having a prescience on the board. In the previous game, he choose Azure Drake over Sylvanas. This turn, he makes a similar choice to play a weaker creature that gets card advantage(Acolyte of Pain) over a beefier creature(Chillwind Yeti). Sure, either creature would have been removed next turn, but to kill the Chillwind Yeti, Artosis would have needed some help from his 1/1 Imp. This means one fewer creature on Artosis' field, which can be very important as we saw from the last game where a 1/1 Imp suddenly became a 5/5 Imp with the help of Blessing of Kings.

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Mistake Rating: 5 I think Artosis is worried about Flamestrike and doesn't want to lose his entire army. He'd rather have a 3/3 left over than a Truesilver durability if Flamestrike Trump plays Flamestrike. The difference between whether or not Trump has Flamestrike available would not have affected the board in a big way, so it isn't worth trying to play around it. In fact, Flamestrike isn't even in Trump's deck, and that's no accident – it costs too much mana and doesn’t help him get the initiative. Regardless, it’s not possible to play around every danger all the time. If you do play around it this turn, are you going to do that next turn too, and the turn after? That would mess up your game. Artosis ends up playing around Flamestrike this turn but walks into it next turn anyway since he couldn't effectively play around it at all times.
Bonus Tip!
Flamestrike is a move that gives card advantage. You can kill multiple enemy creatures with one card, thus getting a lead on cards against your opponent. However, your opponent will have the first opportunity to spend mana playing new creatures after your Flamestrike and may get to dictate combat from there. Flamestrike usually is only effective for getting board control if your opponent is low on cards. Trump's deck features a lot of strong high-value cards, so it needs board control and initiative more than it needs to try for card advantage. Finally, Flamestrike does nothing from turns 1 through 6, which are very critical for how the game progresses! That's why Trump doesn't use Flamestrike in his deck.
Flamestrike is a move that gives card advantage. You can kill multiple enemy creatures with one card, thus getting a lead on cards against your opponent. However, your opponent will have the first opportunity to spend mana playing new creatures after your Flamestrike and may get to dictate combat from there. Flamestrike usually is only effective for getting board control if your opponent is low on cards. Trump's deck features a lot of strong high-value cards, so it needs board control and initiative more than it needs to try for card advantage. Finally, Flamestrike does nothing from turns 1 through 6, which are very critical for how the game progresses! That's why Trump doesn't use Flamestrike in his deck.

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Mistake Rating: 10 Trump sits at 9 life and doesn't play a 3/3 creature when he had the chance. He needs to play his hand as soon as possible before Artosis could kill him. This mistake is very likely to lose him the game if it wasn't lost already.

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Mistake Rating: 1 It's not very clear this is a mistake. It's a close call but I think in an aggressive game like this, you do want to get in every point of damage where possible if doesn't come with a significant downside. A good rule of thumb when you're trying to go for the kill and it's a close call is always to take more damage on the hero.

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Game 3: Artosis Paladin vs Trump Priest
Trump begins by replacing Shadow Madness from his starting hand. This is a questionable decision against Artosis' early creatures, but not necessarily a mistake. Shadow Madness is one of the strongest Priest cards against aggressive creatures early on, and it can win games when it works out well.

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As with most mistakes by both of these players, the goal here was to get greater usage out of a card instead of trying to spend all of one's mana and control the game immediately. Getting the most value out of each card is only necessary if you're running out of cards. As long as you don't run out of cards before the game ends, mana efficiency usually provides the most value. Even if you do run out of cards a little before the end, mana efficiency and getting the initiative is often still better. Getting your creatures on the board first lets you dictate which creatures fight each other, which increases your efficiency. Casting creatures first and getting the initiative can also help you get a life lead and allow for some more efficient plays later. When you're behind on life, sometimes you have to make sacrifices to protect your hero. This means you can get some extra value if your opponent is the on the back foot instead of you.
Mistake Rating: 9 It's turn 2. Artosis has a 2 mana creature with no clear prospects of doing something better with it later. He's not low on cards. He should play his creature instead of something he knows will die immediately with very little benefit. Getting behind early can snowball and cost him the game, especially when we know Artosis has cards like Defender of Argus that require him to have other creatures out for it to be truly effective. Further, Trump uses Argus and Shattered Sun Cleric too, so whoever has board control will get more benefit from their buff creatures. That means board control matters even more in this matchup. Also, keep in mind that Artosis has Lay on Hands in his hand; he has enough power for later so he should focus more on not getting behind early.

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However, Artosis does have another turn 3 option: coin out Spellbreaker. This would leave Artosis with a 4/3 that looks like it'd have a good chance to trade with Trump's 3/3. He would be at risk to a Power Word: Shield or a Holy Smite plus the Novice Engineer's attack, but it's better to fight for control of the game than to sit around doing nothing. How is Artosis going to make a comeback if he does nothing on turns 2 and 3 and his deck lack many of the common comeback cards? Rather, his deck design means the game will frequently snowball out of control if he gets too far behind. However, Artosis is not alone in this and many decks are designed that way. It's not a complaint; it just means he has to try hard for early board control. Besides, the longer Artosis waits to do anything, the closer he gets to facing Mind Control and also the more cards he builds up in his hand that will take a long time to play, if he even manages to play them before dying.
Mistake Rating: 6 This isn't as good of an opportunity as the prior turn and having to use up his coin isn’t ideal. However, it's better to try and contest for board control than to wait for Trump to solidify his position with more creatures, which makes it more difficult for Artosis.

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Artosis should have played Spellbreaker to silence Sylvanas and then play Bloodsail Raider using the coin. Between these two creatures and his Truesilver, Artosis is in a position to kill everything Trump has out while still having Equality and Consecration in reserve. It's normally better to keep spells with an immediate effect in reserve than to keep non-charge creatures. Artosis still has enough life that he doesn't have to worry very much about the potential 8 damage this lets though. In fact, if Trump attacked for 8 damage and played more creatures, then Artosis could use the Equality plus Consecration combo for even better value. Basically it's best to try to fight with your creatures while you can and keep the board clear as a backup if things go really poorly.
Mistake Rating: 6 Stuff like this is not completely clear or straightforward, but it does make a pretty big difference in the outcome.

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Click the screenshot for an enlarged image. Click here for VOD.

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Mistake Rating: 7 Yes, it looks a lot like Trump will win either way but the principle is important. Play your cards and don't waste your mana, unless there is a powerful reason to do otherwise. There no deterrent here and it's a mistake. Although it's very unlikely to cost him this game, this type of play will frequently lose games in general.

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Mistake Rating: 3 Playing Tirion has a good chance of immediately losing the game beyond any hope of a comeback. However, suppose there's a 25% chance Trump doesn't have Mind Control and Artosis gets back into the game, and a 75% chance of losing immediately. Is that a good risk? I think so. The chances of Artosis winning after Lay On Hands, while continuing to save Tirion until Mind Control is cast twice, is very slim. Perhaps it's only a 5% chance, but it's hard to blame Artosis too much for not wanting to walk into a Mind Control. Maybe he is confident in his chances of a comeback in this scenario since he is familiar with how this deck plays out in bad situations. I don't consider this a large mistake, but I think the situation was too desperate not to go for a risky play with a higher potential reward.

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Also, note that Trump ends the turn with 3 mana unspent and still has two 8 mana cards. However, this time he has 4 creatures out and probably the biggest thing to worry about is a second Consecration plus Equality combo. Playing Argent Protector at this time may seem to help against that but the Divine Shield could be destroyed with a weapon by Artosis, followed by Equality and Consecration. It's not too likely Artosis has all that, but why risk anything? With Trump's lead and superior board position, I don't see the need to play another creature at this time.
Mistake Rating: 4 It's not too important in this case, but it still isn't the right play to heal the 4/2.

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Game 4: Artosis Warrior vs Trump Priest

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Playing a 3/3 against a 2/3 in constructed frequently doesn't work out how you want. Your 3/3 may die to Fiery War Axe or the 2/3 may be buffed by Shattered Sun Cleric. Those are both cards Artosis could very easily have in his hand. If you have nothing better to do, you can take a risk like this. But Trump does have a better option.
Trump should have played Shadow Word: Pain. His goal in the early game shouldn't be to get card advantage against an aggressive Warrior. His goal should be to live and avoid anything really bad happening. He's very likely to win in the late game. If his opponent plays a creature and he kills it and nothing bad happens, then that's progress and he should be content with exchange. Playing the Shadow Word: Pain saves his coin, too! And the kicker is if Trump played Shadow Word: Pain, he'd be setting up his next two turns to be coin Chillwind Yeti and followed by a second Yeti, which would be a great start.
Mistake Rating: 10 This is a huge mistake that led to Trump taking a lot of early damage and it likely lost him the entire game.
monk says:Another advantage of saving the coin for his Yeti is that opening with Yeti as your first creature bypasses Warrior's biggest threat: Fiery War Axe. Fiery War Axe is Warrior's best card, a card I would argue is one of the absolute best cards in the game simply because of its absolute early game dominance; it can almost always trade two for one due to the fact that almost all minions costing 3 mana and below have 3 or fewer HP. However, by opening with Yeti, you'll present with a powerful 5HP creature, drastically mitigating the effectiveness of the Axe. Follow it up with a second Yeti and Warriors will really be hurting.
After watching this game and seeing all of Artosis' draws, it was fairly clear to me that Artosis would have had a very difficult time dealing with two Yetis in a row. In retrospect, this play was probably the biggest mistake in the entire series.

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By the way, should Artosis play Upgrade! to go with the Fiery War Axe? No I don't think so. Based on his hand and upcoming expected mana usage, and the possibility of wanting to use a new weapon, it's better to keep the flexibility by saving it. Also, there's the risk of wasting the Upgrade! if Trump plays an Acidic Swamp Ooze.
Mistake Rating: 5 Fiery War Axe is amazing. Use it. Artosis doesn't have a great followup ready in his hand and his attack could fizzle out with his aggressive choice.

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Mistake Rating: 5 I understand the fear of taking 14 damage by turn 3, but if you don't get board control you're going to keep taking damage. Trump needs to get board control, stop the incoming minion damage, and then he can start using Lesser Heal on himself every turn once he has a lead. He can only hope Artosis won't draw all the perfect aggressive cards to finish the game. That's his best chance.
StrifeCro says:I disagree with curi on this one. Juding by the cards Trump has seen so far, he can conlude that this kind of Warrior deck is likely to play two copies of the cards, Charge, Kor'kron Elite, and Arathi Weaponsmith. It could also use combos like Raging Worgen + Inner Rage and Charge. All of these fit into the theme of instant direct damage. Leaving up the 7/2 here is almost a sure loss. As you can see from earlier, Artosis himself was willing to just deal 7 damage on his previous turn and leave up the 7/2 to die to Shattered Sun Cleric.
It is likely Trump would take board control anyways very soon after, but every creature is going to be charging his face anyways. Note that a creature like Kor'kron Elite is only very valuable if the charge damage is relevant. If you use it as a 4 mana removal for 4 damage, it is likely only as strong as a 2-3 mana spell, somewhere between Eviscerate and Shadowbolt. The way this type of Warrior gets value from this type of card is by charging the face and making the enemy deal with the 4/3 that is left afterwards, essentially turning it into both a nuke and a pseudo-removal.

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Conclusions
# Mistakes Made By Each Player
| Game # | # Artosis Mistakes | # Trump Mistakes | Winner |
|---|---|---|---|
| One | 1 | 3 | Artosis |
| Two | 2 | 4 | Artosis |
| Three | 4 | 2 | Trump |
| Four | 1 | 2 | Artosis |
| Total | 8 | 11 | Artosis 3:1 |
Most Severe Mistake by Each Player
| Game # | Most Severe Artosis Mistake | Most Severe Trump Mistake | Winner |
|---|---|---|---|
| One | 7 | 9 | Artosis |
| Two | 5 | 10 | Artosis |
| Three | 9 | 7 | Trump |
| Four | 7 | 10 | Artosis |
Throughout the tournament, a lot of key games were determined by play errors, not luck. Reckful missed lethal damage against Kripp and went on to lose the game. Kripp neglected to play an Acidic Swamp Ooze in the deciding game against Artosis, even though it would have resulted in lethal damage next turn against almost all possible hands Artosis might have had. The result was that Kripp would have won if he'd played the Ooze, but instead he lost the tournament. And let's not forget Trump's turn two error in his final game against Artosis, which knocked him out of the tournament.
In the future when everyone is better at Hearthstone, it's possible that random luck will become a bigger concern. But right now, as you can see in the charts, play errors are pretty common even at the top level. People usually make multiple mistakes per game. No one plays perfectly and skill is the biggest factor in deciding games. That includes both play skill as well as deckbuilding skill (no deck in the Innkeeper's Invitational was perfect, and the metagame is still improving pretty rapidly).
I for one am practicing hard to improve my skill level and improve my decks. I hope you will too.

