Loop reduction

local function checkForMatch(circle)
    local game = circle.parent
    local circles = game.circles
    local matches = {}
    matches.number = 1
    matches[circle] = circle
    local function recurse(circle)
        for i, circle2 in pairs(circles) do
            if isMatch(circle, circle2) and not matches[circle2] then
                matches[circle2] = circle2
                matches.number = matches.number + 1
                recurse(circle2)
            end
        end
    end
    recurse(circle)
    if matches.number > 2 then
        for i, circle in pairs(matches) do
            local i2 = table.indexOf(circles, circle)
            if i2 then
                table.remove(circles, i2)
            end
            circle:removeSelf()
        end
    end
end