diff --git a/sonic-radiance.love/datas/gamedata/events/test/mighty.lua b/sonic-radiance.love/datas/gamedata/events/test/mighty.lua
index 1da68f9..4a82919 100644
--- a/sonic-radiance.love/datas/gamedata/events/test/mighty.lua
+++ b/sonic-radiance.love/datas/gamedata/events/test/mighty.lua
@@ -1,6 +1,7 @@
 return {
     ["actions"] = {
-        {"dialogBox", "haveMoney:lt:300", "You seem to be a bit short on money...", "Mighty", ""},
+        {"dialogBox", "haveMoney:eq:0", "You don't have any rings !", "Mighty", ""},
+        {"dialogBox", {"haveMoney:lt:300", "haveMoney:gt:0"}, "You seems to only have a few rings", "Mighty", ""},
         {"dialogBox", "haveMoney:ge:300", "Wow you're rich !", "Mighty", ""}
     }
 }
\ No newline at end of file
diff --git a/sonic-radiance.love/datas/gamedata/events/test/rouge.lua b/sonic-radiance.love/datas/gamedata/events/test/rouge.lua
index c79b0bf..d737292 100644
--- a/sonic-radiance.love/datas/gamedata/events/test/rouge.lua
+++ b/sonic-radiance.love/datas/gamedata/events/test/rouge.lua
@@ -2,7 +2,8 @@ return {
     ["actions"] = {
         {"dialogBox", "", "Hi Big Blue. Let's test a bit the choice dialog.", "Rouge", ""},
         {"optionBox", "", "What do you want ?", "Rouge", "", "Ring", "A health fruit", "Battling badnics", "optionFlag"},
-        {"dialogBox", "optionFlag:1", "Oooh, in need of cash ?", "Rouge", ""},
+        {"dialogBox", {"optionFlag:1", "haveMoney:lt:300"}, "Oooh, in need of cash ?", "Rouge", ""},
+        {"dialogBox", {"optionFlag:1", "haveMoney:gt:300"}, "You doesn't seem that poor to me.", "Rouge", ""},
         {"dialogBox", "optionFlag:2", "Did you failed your battle ? Well, you'll have to train more", "Rouge", ""},
         {"dialogBox", "optionFlag:3", "Let's see if you can keep it up", "Rouge", ""},
     }
diff --git a/sonic-radiance.love/game/events/conditions.lua b/sonic-radiance.love/game/events/conditions.lua
new file mode 100644
index 0000000..d479a24
--- /dev/null
+++ b/sonic-radiance.love/game/events/conditions.lua
@@ -0,0 +1,12 @@
+local Conditions = {}
+
+function Conditions.haveMoney(cond, predicate, asker)
+    return predicate.utils.testVariables(game.loot.rings , cond[2], cond[3])
+end
+
+function Conditions.default(cond, predicate, asker)
+    local flag = predicate.utils.merge(cond)
+    return asker:haveFlag(flag)
+end
+
+return Conditions
\ No newline at end of file
diff --git a/sonic-radiance.love/game/events/conditions/init.lua b/sonic-radiance.love/game/events/conditions/init.lua
deleted file mode 100644
index 3e6f34a..0000000
--- a/sonic-radiance.love/game/events/conditions/init.lua
+++ /dev/null
@@ -1,8 +0,0 @@
-local Conditions = {}
-local ConditionsUtils = require "game.events.conditions.utils"
-
-function Conditions.haveMoney(cond)
-    return ConditionsUtils.testVariables(game.loot.rings , cond[2], cond[3])
-end
-
-return Conditions
\ No newline at end of file
diff --git a/sonic-radiance.love/game/events/conditions/utils.lua b/sonic-radiance.love/game/events/conditions/utils.lua
deleted file mode 100644
index 882a0c9..0000000
--- a/sonic-radiance.love/game/events/conditions/utils.lua
+++ /dev/null
@@ -1,31 +0,0 @@
-local ConditionsUtils = {}
-
-function ConditionsUtils.testVariables(var1, testType, var2)
-    local var2 = tonumber(var2)
-    if (testType == "eq" and var1 == var2) then
-        return true
-    end
-    if (testType == "ne" and var1 ~= var2) then
-        return true
-    end
-    if (testType == "gt" and var1 > var2) then
-        return true
-    end
-    if (testType == "ge" and var1 >= var2) then
-        return true
-    end
-    if (testType == "lt" and var1 < var2) then
-        return true
-    end
-    if (testType == "le" and var1 <= var2) then
-        return true
-    end
-
-    return false
-end
-
-function ConditionsUtils.testBool(bool, boolType)
-    return (bool == (boolType == "V"))
-end
-
-return ConditionsUtils;
\ No newline at end of file
diff --git a/sonic-radiance.love/game/events/init.lua b/sonic-radiance.love/game/events/init.lua
index 72fbb89..af3530a 100644
--- a/sonic-radiance.love/game/events/init.lua
+++ b/sonic-radiance.love/game/events/init.lua
@@ -3,6 +3,7 @@ local EventManager = Object:extend()
 local stepObjectList = require "game.events.event"
 local Conditions = require "game.events.conditions"
 
+local Predicates = require "birb.classes.predicate"
 
 function EventManager:new(scene)
     self.scene = scene
@@ -37,19 +38,8 @@ function EventManager:addFlag(flagname, flagcontent)
 end
 
 function EventManager:testCondition(condition)
-  if (utils.string.isEmpty(condition)) then
-    return true
-  end
-  local conditionArgs = utils.string.split(condition, ":")
-  if (Conditions[conditionArgs[1]] == nil) then
-    return self:haveFlag(condition)
-  else
-    local conditionFulfilled = Conditions[conditionArgs[1]](conditionArgs)
-    if (conditionArgs[#conditionArgs] == "not") then
-      conditionFulfilled = (not conditionFulfilled)
-    end
-    return conditionFulfilled
-  end
+  local predicate = Predicates.createPredicate(condition, Conditions, self)
+  return predicate:solve()
 end
 
 function EventManager:haveFlag(flagToTest)