def doPlanarGateChance(self, iPlayer, pCity):
    gc          = CyGlobalContext()
    game        = CyGame()
    iX           = pCity.getX()
    iY           = pCity.getY()
    getPlot = CyMap().plot

    if iPlayer == -1:
        pPlayer = gc.getPlayer(game.getActivePlayer())
    else:
        pPlayer = gc.getPlayer(iPlayer)

    iMult = 1
    iHell = 0
    iAC = game.getGlobalCounter()

    if iAC >= 10:
        iMult += 0.15
    if iAC >= 20:
        iMult += 0.15
    if iAC >= 30:
        iMult += 0.15
    if iAC >= 40:
        iMult += 0.15
    if iAC >= 50:
        iMult += 0.15
    if iAC >= 60:
        iMult += 0.15
    if iAC >= 70:
        iMult += 0.15
    if iAC >= 80:
        iMult += 0.15
    if iAC >= 90:
        iMult += 0.15
    if iAC == 100:
        iMult += 0.15

    for iiX,iiY in BFC:
        pLoopPlot = getPlot(iX+iiX,iY+iiY)
        if not pLoopPlot.isNone():
            iTerrain = pLoopPlot.getTerrainType()
            if iTerrain.isHell():
                iHell += 1

    if iHell != 0:
        iMult += iHell * 0.05

    iPlanarGateChance = (self.Defines["Planar Gate"] * iMult)
    iPlanarGateChance = scaleInverse(iPlanarGateChance)

    pCity.setCityCounter(iPlanarGateChance)