From what I've learned about chart forecasting is that they will always give you a 33% chance of guessing tomorrow's SP move correctly.

But the 33% chance is not a result of the charting. The 33% probability is a function of the fact that there are only 3 possible outcomes; the price can only go up, down, or stay the same. It's a random bet (while looking at charts or while praying) with only 3 possible outcomes.

By focusing on the 33% of the time the chart forecasts were right and ignoring the 66% of the time they were wrong you get a convincing picture.

Bottom line; if charts really worked we'd all be rich.