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Building Board Games with Ruby

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Yonatan Bergman @YONBERGMAN

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Tech Lead eBay Israel Innovation Center

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60+ GAMES* *not my collection

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Intro to board games

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Monopoly

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Risk

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Settlers of Catan

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Carcassonne

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Ticket to Ride

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Agricola

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Galaxy Trucker

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The Resistance

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2000 540 Games Published Per Year

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2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2000 540 547 614 759 850 956 943 974 987 1053 1100 1106 1118 1033 Games Published Per Year

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GAME DESIGNER

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GAME DESIGNER

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PUBLISHER

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DEVELOPMENT

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PLAYTESTING

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MANUFACTURING

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MANUFACTURING

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Kickstarter

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2010 2011 2012 2013 2014 H1 $30M $100K Kickstarter

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Print & Play

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ATTACK BLOCK CHARGE

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ATTACK BLOCK CHARGE

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ATTACK BLOCK CHARGE

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ATTACK BLOCK CHARGE

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ATTACK BLOCK CHARGE

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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ,''''', '''''' '''' :++++++ `++++++, '''' '''' ++++++++++++++ `++++++. 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+++++++++++ ++++ ++++ +++++++++++++` +++++++++++ +++ ++ ,+++, ++++ +++, ++++ ++++ .+++++++++ '++++++++; ++++ ++++ +++++++++++++` '++++++++, ;++ ;+; '. ,+++, ,+++``+++ ++++ ++++ '++++++, .+++++++ ++++ ++++ ++++ ,+++++++ ++ ++ +. ,+++, +++;'+++ ++++ ++++ '+++++ `+++++ ++++ ++++ ++++ .+++++ ;+. ,++ +` ,+++, ++++++++ ++++ ++++ ```` +++++ ```` ++++ ++++ ++++ ++++ ```` `++++ ++ ++ `+ ,+++, +++++++: ++++ ++++ ++++ ++++ ++++ ++++` ++++ ++++ ++++ ++++ ++++ ++ `++;+ ,+++, ;++++++ ++++ ++++ ++++ ++++ ++++` ++++ ++++ ++++ ++++ ++++ ++++ +' ++++ ,+++, ++++++ ++++ ++++ ++++ ++++ +++++ ++++ ++++ ++++ ++++ ++++' ++++ +' ++' ,+++, ++++++ ++++ ++++ +++++ ++++; ,++++ ++++ ++++ ++++ ++++ ;++++ .++++ ++ ++, ,+++, +++++' ++++ ++++ '+++++ +++++ +++++, .+++++ ++++ +++++++++++++` ++++++++++++++` +++++. ,+++++ ++ +++ ,+++, '++++` ++++ ++++ ++++++++++++++ ++++++++++++++. ++++ +++++++++++++` ++++++++++++++` ++++++++++++++ ;+, ++'+; ,+++, `++++ ++++ ++++ '++++++++++++. +++++++++++++ ++++ +++++++++++++` ++++++++++++++` +++++++++++++ ++ ;++ ++ ,+++, ++++ ++++ ++++ +++++++++++' .+++++++++++ ++++ +++++++++++++` ++++++++++++++` ,+++++++++++ ;++; `+++ ,+' ,+++, ++++ ++++ ++++ '++++++++: `+++++++++ ++++ +++++++++++++` ++++++++++++++` .+++++++++ '++++++ ++ ;++++: .++++'` .++++'` `;+'` ;+++: .++++` .+++' :+', ,+++++; ++++++ ++++ '+++++++: ++++++++++++` `++++++++ `++++++++ ++++: ++++; ++++, +++++++++++. ++++++++ ,++++++ ++++++ ++++ ++++++++++' +++++++++++++; ,++++++++++` :++++++++++ ++++: ++++; ++++, +++++++++++++ ++++++++++ ,++++++ ++++++ ++++ ++++++++++++: ++++++++++++++. `++++++++++++ `++++++++++++ ++++: ++++; ++++, ++++++++++++++ ++++++++++++ ,++++++ ,++++++ ++++ .+++++++++++++ +++++++++++++++ ++++++++++++++ +++++++++++++, ++++: ++++; ++++, ++++++++++++++` ;++++++++++++, ,++++++, +++++++ ++++ +++++++;++++++' +++++++++++++++` :++++++;'++++++` ;++++++;'++++++ ++++: ++++; ++++, +++++++++++++++ +++++. `'+++++ ,+++++++ +++++++ ++++ `+++++ +++++ ++++ ,++++' +++++. :+++++ +++++` +++++` ++++: ++++; ++++, ++++` +++++ ++++ :++++ ,+++++++ +++++++ ++++ +++++ `++++ ++++ +++++ `++++: '++++ .++++, +++++ ++++: ++++; ++++, ++++` ++++ `++++ ++++ ,+++++++ +++++++ ++++ ++++: ++++: ++++ :++++ +++++ ++++: +++++ ,++++ ++++: ++++; 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++++. ++++++++++++ ;++++++ ,+++, ++++++++ ++++ ++++ ++++' ++++ ++++ :++++ ++++ ++++ ++++ ++++ ++++: ++++; ++++, ++++,....` +++++ ,+++, ++++++++ ++++ ++++ :++++ `++++ ++++ ++++` ++++ .++++ ++++ ++++ ++++: ++++; ++++, ++++` ++++ `++++ ,+++, +++++++. ++++ ++++ ++++ '++++ ++++ ++++, ++++; +++++ ++++: ++++ ++++: ++++; ++++, ++++` ++++ ++++ ,+++, ,++++++ ++++ ++++ ++++; ++++, ++++ ;+++; '++++ ++++, +++++ '++++ ++++: ++++; ++++, ++++` ++++ ++++ ,+++, ++++++ ++++ ++++ +++++ ,++++ ++++ ,+++' ++++' +++++ `++++; ++++; ++++: ++++; ++++, ++++` ++++' ++++ ,+++, ++++++ ++++ ++++ +++++ `+++++ ++++ `++++ +++++: '+++++ +++++: +++++ ++++: ++++; ++++, ++++` '++++` +++++ ,+++, +++++: ++++ ++++ ++++++++++++++, ++++ ++++ .++++++++++++++ ,++++++++++++++ ++++: ++++; ++++, ++++` ++++++.`:+++++` ,+++, :++++ ++++ ++++ +++++++++++++ ++++ ++++ ++++++++++++++ +++++++++++++ ++++: ++++; ++++, ++++` ++++++++++++++ ,+++, ++++ ++++ ++++ :+++++++++++ ++++ ++++ ++++++++++++ +++++++++++' ++++: ++++; ++++, ++++` ++++++++++++` ,+++, ++++ ++++ ++++ ;+++++++++. ++++ ++++ ++++++++++ ++++++++++ ++++: ++++; ++++, ++++` ++++++++++, ,+++, +++; ++++ ++++ `+++++++ ++++ ++++ +++++++' +++++++, ++++: ++++; ++++. ++++` ++++++++ .:. `,, `:, `,:`

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! game = SimpleGame.new(players: 4) game.run > “Winner: ["#Player 2"] at turn number 31”


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! game = SimpleGame.new(starting_energy: 10, 
 winning_energy: 20) game.run > “ --- TURN 1 --- “ 
 > “ #Player 1 (10) defends “
 > “ #Player 2 (10) attacks #Player 3 (10) “ 
 > “ #Player 3 (9) charges (10) “
 > …
 > “ --- TURN 47 --- “
 > “ #Player 1 (13) defends “
 > “ #Player 3 (19) charges (20) “
 > 
 > “ Winner: ["#Player 3"] at turn number 47 "

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! games = MultiGames.new(games: 1000) games.simulate! ! game.average_turns
 > 24.821 game.victory_count_per_player
 > “ [["Player 1", 314], “ 
 > “ ["Player 2", 354], “
 > “ ["Player 3", 340]] “


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! class ActionResolver def resolve
 case player.action
 when :attack then resolve_attack
 when :charge then resolve_charge
 when :block then resolve_block
 end
 end def resolve_charge
 Result.new(player: +1)
 end end

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! class RoundResolver def resolve
 @players.each do |player|
 resolver = ActionResolver.new(player)
 result = resolver.resolve()
 player.energy += result.player
 player.target.energy += result.target
 end
 end end

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! class GameRound def run
 start_turn
 choose_cards
 reveal_aim_cards
 change_actions
 reveal_action_cards
 resolve_actions
 end_turn
 end end

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! class ActionResolver def resolve
 case player.action
 when :attack then resolve_attack
 when :charge then resolve_charge
 when :block then resolve_block
 end
 end def resolve_charge
 Result.new(player: +1)
 end end

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! class ActionResolver def resolve
 case player.action
 when :attack then resolve_attack
 when :charge then resolve_charge
 when :block then resolve_block
 end
 end def resolve_charge
 unless under_attack?
 Result.new(player: +1)
 end
 end
 end

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! class ActionResolver class Result < Hashie::Dash
 property :player, default: 0
 property :target, default: 0
 end . . . Result.new(player: +1, target: -1)
 
 end

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! class Player::Random < Player::Abstract def choose_aim
 targets.sample
 end def choose_action
 actions.sample
 end def change
 false
 end end

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! class Player::Simple < Player::Random def choose_action
 if low_energy?
 [:block, :charge].sample
 else
 actions.sample
 end
 end def change
 targeted? ? :block : false
 end end

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! games = MultiGames.new(players: [
 Player::Random.new,
 Player::Random.new, 
 Player::Simple.new,
 ]) games.simulate! game.victory_count_per_player
 > “ [["Random 1", 30.08], “ 
 > “ ["Random 2", 31.93], “
 > “ ["Simple 3", 38.13]] “


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! games = MultivariantGame.new games.simulate!
 > “...................“ games.save(“output.csv”)

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2 1 5 4.0913 LMS 90.37% VP 9.63% 2 2 5 6.0226 LMS 73.47% VP 26.53% 2 3 5 6.1922 LMS 50.30% VP 49.70% 2 4 5 4.0649 VP 77.52% LMS 22.48% 2 1 6 4.7287 LMS 93.21% VP 6.79% 2 2 6 7.4563 LMS 82.80% VP 17.20% 2 3 6 8.8977 LMS 66.31% VP 33.69% 2 4 6 8.2597 VP 53.56% LMS 46.44% 2 5 6 5.0287 VP 79.29% LMS 20.71% 2 1 7 5.0806 LMS 95.63% VP 4.37% 2 2 7 8.6032 LMS 87.94% VP 12.06% 2 3 7 11.1296 LMS 76.95% VP 23.05% 2 4 7 11.9691 LMS 61.34% VP 38.66% 2 5 7 10.266 VP 58.27% LMS 41.73% 2 6 7 5.9262 VP 80.90% LMS 19.10% 2 1 8 5.406 LMS 97.02% VP 2.98% 2 2 8 9.4609 LMS 91.88% VP 8.12% 2 3 8 12.9289 LMS 83.70% VP 16.30% 2 4 8 14.8757 LMS 72.81% VP 27.19% 2 5 8 15.0612 LMS 56.91% VP 43.09% 2 6 8 12.5056 VP 60.03% LMS 39.97% NUMBER OF PLAYERS STARTING ENERGY ENERGY TO WIN —————————— AVERAGE TURNS

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2 1 5 4.0913 LMS 90.37% VP 9.63% 2 2 5 6.0226 LMS 73.47% VP 26.53% 2 3 5 6.1922 LMS 50.30% VP 49.70% 2 4 5 4.0649 VP 77.52% LMS 22.48% 2 1 6 4.7287 LMS 93.21% VP 6.79% 2 2 6 7.4563 LMS 82.80% VP 17.20% 2 3 6 8.8977 LMS 66.31% VP 33.69% 2 4 6 8.2597 VP 53.56% LMS 46.44% 2 5 6 5.0287 VP 79.29% LMS 20.71% 2 1 7 5.0806 LMS 95.63% VP 4.37% 2 2 7 8.6032 LMS 87.94% VP 12.06% 2 3 7 11.1296 LMS 76.95% VP 23.05% 2 4 7 11.9691 LMS 61.34% VP 38.66% 2 5 7 10.266 VP 58.27% LMS 41.73% 2 6 7 5.9262 VP 80.90% LMS 19.10% 2 1 8 5.406 LMS 97.02% VP 2.98% 2 2 8 9.4609 LMS 91.88% VP 8.12% 2 3 8 12.9289 LMS 83.70% VP 16.30% 2 4 8 14.8757 LMS 72.81% VP 27.19% 2 5 8 15.0612 LMS 56.91% VP 43.09% 2 6 8 12.5056 VP 60.03% LMS 39.97%

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2 1 5 4.0913 LMS 90.37% VP 9.63% 2 2 5 6.0226 LMS 73.47% VP 26.53% 2 3 5 6.1922 LMS 50.30% VP 49.70% 2 4 5 4.0649 VP 77.52% LMS 22.48% 2 1 6 4.7287 LMS 93.21% VP 6.79% 2 2 6 7.4563 LMS 82.80% VP 17.20% 2 3 6 8.8977 LMS 66.31% VP 33.69% 2 4 6 8.2597 VP 53.56% LMS 46.44% 2 5 6 5.0287 VP 79.29% LMS 20.71% 2 1 7 5.0806 LMS 95.63% VP 4.37% 2 2 7 8.6032 LMS 87.94% VP 12.06% 2 3 7 11.1296 LMS 76.95% VP 23.05% 2 4 7 11.9691 LMS 61.34% VP 38.66% 2 5 7 10.266 VP 58.27% LMS 41.73% 2 6 7 5.9262 VP 80.90% LMS 19.10% 2 1 8 5.406 LMS 97.02% VP 2.98% 2 2 8 9.4609 LMS 91.88% VP 8.12% 2 3 8 12.9289 LMS 83.70% VP 16.30% 2 4 8 14.8757 LMS 72.81% VP 27.19% 2 5 8 15.0612 LMS 56.91% VP 43.09% 2 6 8 12.5056 VP 60.03% LMS 39.97%

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AVG TURNS ENERGY TO WIN STARTING ENERGY

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AVG TURNS ENERGY TO WIN STARTING ENERGY

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AVG TURNS ENERGY TO WIN STARTING ENERGY

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AVG TURNS ENERGY TO WIN STARTING ENERGY

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Winning Energy Starting Energy Zero Energy

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AVG TURNS NUMBER OF PLAYERS

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AVG TURNS NUMBER OF PLAYERS

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AVG TURNS NUMBER OF PLAYERS

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2 1 5 4.0913 LMS 90.37% VP 9.63% 2 2 5 6.0226 LMS 73.47% VP 26.53% 2 3 5 6.1922 LMS 50.30% VP 49.70% 2 4 5 4.0649 VP 77.52% LMS 22.48% 2 1 6 4.7287 LMS 93.21% VP 6.79% 2 2 6 7.4563 LMS 82.80% VP 17.20% 2 3 6 8.8977 LMS 66.31% VP 33.69% 2 4 6 8.2597 VP 53.56% LMS 46.44% 2 5 6 5.0287 VP 79.29% LMS 20.71% 2 1 7 5.0806 LMS 95.63% VP 4.37% 2 2 7 8.6032 LMS 87.94% VP 12.06% 2 3 7 11.1296 LMS 76.95% VP 23.05% 2 4 7 11.9691 LMS 61.34% VP 38.66% 2 5 7 10.266 VP 58.27% LMS 41.73% 2 6 7 5.9262 VP 80.90% LMS 19.10% 2 1 8 5.406 LMS 97.02% VP 2.98% 2 2 8 9.4609 LMS 91.88% VP 8.12% 2 3 8 12.9289 LMS 83.70% VP 16.30% 2 4 8 14.8757 LMS 72.81% VP 27.19% 2 5 8 15.0612 LMS 56.91% VP 43.09% 2 6 8 12.5056 VP 60.03% LMS 39.97%

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! class ActionResolver def resolve_block
 Result.new(player: -1) unless under_attack?
 end end

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2 1 5 4.0913 LMS 90.37% VP 9.63% 2 2 5 6.0226 LMS 73.47% VP 26.53% 2 3 5 6.1922 LMS 50.30% VP 49.70% 2 4 5 4.0649 VP 77.52% LMS 22.48% 2 1 6 4.7287 LMS 93.21% VP 6.79% 2 2 6 7.4563 LMS 82.80% VP 17.20% 2 3 6 8.8977 LMS 66.31% VP 33.69% 2 4 6 8.2597 VP 53.56% LMS 46.44% 2 5 6 5.0287 VP 79.29% LMS 20.71% 2 1 7 5.0806 LMS 95.63% VP 4.37% 2 2 7 8.6032 LMS 87.94% VP 12.06% 2 3 7 11.1296 LMS 76.95% VP 23.05% 2 4 7 11.9691 LMS 61.34% VP 38.66% 2 5 7 10.266 VP 58.27% LMS 41.73% 2 6 7 5.9262 VP 80.90% LMS 19.10% 2 1 8 5.406 LMS 97.02% VP 2.98% 2 2 8 9.4609 LMS 91.88% VP 8.12% 2 3 8 12.9289 LMS 83.70% VP 16.30% 2 4 8 14.8757 LMS 72.81% VP 27.19% 2 5 8 15.0612 LMS 56.91% VP 43.09% 2 6 8 12.5056 VP 60.03% LMS 39.97%

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! class Player::SingleMinded < Player::Abstract def choose_action
 return @action
 end end

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! games = MultiGames.new(players: [
 Player::Simple.new,
 Player::Simple.new, 
 Player::SingleMinded.new(action: :block),
 ]) games.simulate! game.victory_count_per_player
 > “ [["Simple 1", 44.95], “ 
 > “ ["Simple 2", 45.28], “
 > “ [“Single Minded block", 9.77]] “


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WRITING RULES IS HARD

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! games = MultiGames.new(players: [
 Player::Simple.new,
 Player::Simple.new, 
 Player::SingleMinded.new(action: :block),
 ]) games.simulate! game.victory_count_per_player
 > “ [["Simple 1", 44.95], “ 
 > “ ["Simple 2", 45.28], “
 > “ [“Single Minded block", 9.77]] “
 yonbergman/missiles_and_microchips

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GIVEAWAY ! ! My first computer #gogaruco #microchips

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@YONBERGMAN