Stronger than you would imagine!
At first glance Checkmate looks like you are predicting a 1 out of 3 outcome, but in fact it is stronger than that since you not only predict which color chess piece they will choose, but also which plaque they will place it on.
There is no forcing of colors, the answer can be different each time, but the effect cannot be repeated. The mulitple outs that are constructed into the wooden tablets are very convincing and not contrived as sometimes is the case.
I used to give this 4 stars, but over the years I have grown to appreciate its simplicy even more so have raised it to a 5.
Highly Recommended!
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